Hybrid Battery Charger With Load Control for Telecom Equipment

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Hybrid Battery Charger With Load Control for Telecom Equipment
Application Report
                                                                                                                      SLPA013 – October 2014

                              Hybrid Battery Charger With Load Control for
                                                      Telecom Equipment

                                                                    ABSTRACT
       Commercial telecom equipment needs multiple power input systems to ensure continuous network
       connectivity. The load must be backed up to different sources. This application note describes a
       synchronous-buck-based reference design using MSP430 and CSD87350 power blocks, which use
       multiple OR’ed inputs (solar and AC/DC adaptor) to charge a 12-V SLA battery. Priority charging is used
       when solar energy is available. Seamless transfer between two sources ensures battery is always charged
       when inputs are available. It runs MPPT algorithms to charge while on solar input and conventional
       CC/CV charging when working from an adaptor input. Multiple protection schemes ensure it is a robust
       design.

       Topic   ...........................................................................................................................   Page

          1       Design Specifications ........................................................................................... 2
          2       Block Diagram ..................................................................................................... 2
          3       System Explanation and Design ............................................................................ 3
          4       Software Flow...................................................................................................... 4
          5       Schematics ......................................................................................................... 9
          6       Test Results ...................................................................................................... 11

SLPA013 – October 2014                                              Hybrid Battery Charger With Load Control for Telecom Equipment              1
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Hybrid Battery Charger With Load Control for Telecom Equipment
Design Specifications                                                                                                              www.ti.com

1         Design Specifications

                                                          Table 1. Design Specifications
                       Parameter                                     Description                                      Value
                                                 Panel                                               16.5 to 21 V
           VIN range
                                                 Adaptor                                             15.5 to 16 V
           Battery specifications                Capacity                                            12 V, 100 Ah
                                                 Charging current                                    7A
           Charging specifications
                                                 Voltage during CV mode charging                     14.2 V
           FSW                                   Switch frequency                                    100 kHz
                                                 Load current                                        4A
           Output specifications
                                                 Output voltage                                      10.2 to 14.2 V
                                                   •   Hot swappable load
                                                   •   Output short circuit
                                                   •   Reverse polarity protection
           Protection features
                                                   •   Two level overcurrent protection
                                                   •   Battery UVLO
                                                   •   Overtemperature protection

2         Block Diagram
          Figure 1 shows the block level implementation of the system.

         100-W
    12-V Solar Panel

                                                                                                                 Temp Sensor

                                 Input Current             Sync Buck            Output Current         Load Current
       Oring Control                                                                                                           Load Switch
                                    Sense                  Converter               Sense                  Sense

                                                                                                                           Telecom
                                                         Microcontroller         VBAT
                                           ICS
                                                                                                                          Equipment
                                                                                 VPANEL
          Universal                       OCS                                    LCS
         AC Adaptor
    (15 V at 7-A Capacity)

                                                              LDO

                                                                    Figure 1.

2         Hybrid Battery Charger With Load Control for Telecom Equipment                                              SLPA013 – October 2014
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www.ti.com                                                                                      System Explanation and Design

3      System Explanation and Design

3.1    Power Source Control and Monitoring
       The telecom equipment (load) is always powered either from a solar panel, AC/DC adaptor, or the battery.
       As long as solar energy from the panel is available, priority charging is used to deliver the required power
       (average 17 V and current sufficient enough to manage load or to charge battery). If panel voltage drops
       below adapter (15 V), the charge controller microcontroller turns off the panel switch and turns on the
       AC/DC adapter switch, which also ensures no leakage of the stronger source into the weaker one. Two
       30-V, ultra-low RDS(on) FETs from TI (CSD17527Q5A) are selected for this purpose. The simple transistor is
       used for proving the drive from the microcontroller.

3.2    Synchronous Buck Power Stage
       The synchronous buck convertor has better efficiency and lower loss compared to asynchronous topology
       because a diode on the bottom side is replaced with a low RDS(on) value. A single 30-V, 25-A power block
       from TI (CSD87350Q5D) is selected for this. The advantage of a power block is the smaller package and
       ease of layout eliminating parasitics of board layout of high frequency hot nodes. The microcontroller
       PWM module can generate multiple PWMs on the same timer base. Each output can be configured for
       different output modes, for example, toggle, reset/on, reset/off, always on, and so forth. With this flexible
       logic, the user can achieve complimentary logic with required dead band. However, a driver UCC27211 is
       used to enable ease of driving. The other power stage components (inductor and capacitor) calculations
       are designed using standard equations of the buck converter based on the prior specifications.
       • LOUT (cal) = 12.67 μH, selected LOUT = 10 μH, from Wurth Electronics
       • Selected COUT = 47 µF × 1; 22 µF × 2

3.3    Current Sense Inputs
       To ensure continuity to ground loop, a high-side sense circuit was used. A zero-drift instrumentation
       amplifier from TI, INA282, with a 50-V/V gain, wide common-mode input range is selected for this
       application.

3.4    Load Management
       A simple load switch with hotswap control from TI TPS25910 is used for monitoring the load behavior. If
       there is any short or overload, it immediately trips sending it into a hiccup mode on the load. The fast-trip
       comparator of the microcontroller also quickly disables the PWM. This is second-level protection for the
       load. To prevent the load from discharging back into the source, a blocking FET (CSD17313Q2) from TI is
       used. It is controlled by the load switch.

3.5    Microcontroller
       A MSP430F5132 microcontroller is used in this application. See Section 4 for further details of the
       software routines.

3.6    LDO and Temperature Sensor
       A simple OR’ed supply is used as the input of the LDO to ensure that power to the controller is always
       available to sense any inappropriate condition. The 3.3 V generated by the LDO (TPS73801) is used to
       power the MCU, LEDs, instrumentation amplifiers, and a simple thermostat TMP709, which is used for
       tripping the load in case there is any abnormal increase in the temperature.

3.7    Battery Management
       The section explains the battery management software portion in the microcontroller. It checks for the
       state-of-charge of the battery and applies the charging profile appropriately. This application uses a lead-
       acid battery. The following list shows the battery properties that are considered while charging.
       • Minimum 2.10 V per cell is considered as a good battery
       • Cells in a string are not the same strength, some are weak and some are strong.

SLPA013 – October 2014                                      Hybrid Battery Charger With Load Control for Telecom Equipment   3
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System Explanation and Design                                                                                   www.ti.com

      •   Should not be charged above 50°C
      •   Overcharging increases the risk of hydrogen gassing on the positive plate.
      •   Undercharging increases sulfation on the negative plate.
      •   Battery charge profile is in constant current mode until battery attains, for example, 70%, constant
          voltage mode from 70% to 90% and float charge after that.

3.8   Maximum Power Point Tracking Algorithm
      A simple MPPT algorithm known as perturb and observe is used for controlling this system. As explained
      in the PWM Resolution section, every one count of PWM timer yields 0.04% of duty cycle variation, which
      is “fine” enough to achieve smoother and slower tracking. With this at MPP stage, there will be 0.04%
      oscillation which may be negligible in a low-power application. If duty cycle variation is increased more
      than 1 count, tracking is faster and reduces the variation to minimize the MPP stage oscillations. This also
      resembles incremental conductance method. It monitors battery/load current with respect to ΔV applied to
      the converter, increasing the ΔV drives to MPP faster and at the MPP stage reduces the ΔV and settles
      smoothly at MPP.

4     Software Flow
      This application uses the MSP430F5132 microcontroller. The following are key features, which enable
      efficient usage of resources to achieve an efficient solar power convertor.
      MSP430F5132 key features supporting efficiency expectation:
      • Fully operates from 3.6 to 1.8 V
      • Only 180-µA/MHz active current, lowest current at shut down is 0.25 µA
      • Fast wake-up, less than 5 µs from stand by
      • 200 KSPS, 10-bit ADC, with just 110-µA current consumption with built-in reference
      • Hi-resolution timer/PWM = 4-ns minimum pulse duration, 250-µA current consumption

4.1   PWM Resolution
      The MSP430F5132 has a special hi-resolution timer, timer-D. This timer can be programmed to generate
      high switching frequency to accommodate a smaller inductor's size. This timer is clocked from the
      following sources:
      • MCLK/SMCLK – Maximum range is 16 MHz
      • ACLK – Maximum 32 kHz
      • Special timer-D clock generator of the following values:
          – 64 MHz
          – 128 MHz
          – 200 MHz
          – 256 MHZ
      Effective number of bits (ENOB) is an important parameter in achieving smoother control, thereby
      reducing switching noise and protecting the battery from stress caused by larger voltage variations caused
      in a low-resolution system.
            ENOB = Log2(Module clock / Output frequency)                                                                (1)
      This application requires 100-kHz switching frequency. Therefore, the following settings provide,
      Module clock = 256 MHz
      Output frequency = 100 kHz
      ENOB = 11.36 bits
            VOUT = D × VIN
            where
                 •   D = Duty cycle or on-time of the switch

4     Hybrid Battery Charger With Load Control for Telecom Equipment                                 SLPA013 – October 2014
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                  •   VIN = Input voltage (from battery, solar panel, or ACDC adapter)
                  •   VOUT = Output voltage                                                                                    (2)
       Consider the converter to be 100% efficient. Therefore, no loss factor is taken into account in this
       calculation. For a single bit change in D varies by approximately 4 ns in a 100-kHz period wave, which is
       0.038% of VIN; if a VIN of 17, VOUT varies by 0.00646 V.

4.2    ADC Module
       This device has 10-bit SAR ADC, speed can be configured for 50ksps for low power or 200ksps for faster
       processing. This application can go slow, which helps to conserve additional power loss caused by the
       ADC module itself (refer to the data sheet for power consumption data). This module can be operated
       independently without sharing the CPU clock. Hence, the CPU can be placed in low-power mode,
       enabling only the ADC to function.
       A special ADC DMA can be configured to scan all channels and interrupt the CPU when data is available
       at the RAM for further processing. This application requires 6 channels: battery current, panel current,
       battery voltage, panel voltage, load current, and temperature sensor. Therefore, a 6-channel conversion is
       required every loop, until then the CPU can be put in IDLE to conserve power.

4.3    ADC Measurement Range
       This MCU has a 10-bit SAR ADC, input voltage range is 0 V to AVCC, which can be up to 3.6 V (refer to
       data sheet for more electrical data). Hence, input signal strength can be from 3.3 mV per count of ADC
       until 3.3 V (1023 counts) can be sensed. Sense resistors are 5 mΩ. Hence, minimum current sensible
       from panel/load/battery with a gain of 50 is about 13 mA.

                                                        Power on/
                                                         Reset

                                 Source                                         Source
                                   S1                                             S2
                                Panel V x I                                   Adapter V x I

              Select S1,                                                                               Select S2,
             Turn OFF S2
                                                          S1 ≥ S2                                     Turn OFF S1

                                                         Init ADC
                                                        Init PWM
                                             Init Comparator for Tripping
                                                   Start Control Loop

                                          Figure 2. Initialization Flow Chart

SLPA013 – October 2014                                        Hybrid Battery Charger With Load Control for Telecom Equipment    5
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Software Flow                                                                                                                  www.ti.com

                                                    ADC Interrupt every
                                                         100 ms

                                          SAMPLE
                                         • Panel Voltage (P_V)
                                         • Panel Current (P_I)
                                         • Battery Voltage(B_V)
                                         • Battery Current(B_I)                                     Wait for ADC
                                         • Adaptor Voltage (A_V)                                     Interrupt
                                         • Load Current(A_I)

                                                                               Yes      • Disable Battery Charging Algorithm
                                                      B_V > P_V
                                                         &&                             • Only Load Management Thread
                                                      B_V > A_V                         • Turn OFF Panel and Adaptor Indicator LEDs

                                                                               Yes      • Panel Switch OFF, Adaptor switch ON
                                                      P_V < A_V
                                                          &&                            • Turn OFF Panel LED and Turn ON Adaptor
                                                       P_I ~= 0*                          Indicator LED
                                                                                        • Load Management and CC/CV Mode

    • Adaptor Switch OFF, Panel switch ON         Yes                  P_V > A_V
    • Turn OFF Adaptor LED and Turn ON Panel                               &&
                                                                      P_I > Lowest
      Indicator LED
                                                                       Threshold*

                   P_V > B_V
                                            Yes
                                                     • Call Current Control (MPPT) and Load
                        &&
                 P_I > Threshold                       Management
                                            No
                                                     • Load Management

                                               Figure 3. Control Loop Flow Chart

6        Hybrid Battery Charger With Load Control for Telecom Equipment                                           SLPA013 – October 2014
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                                                 Current Control
                                                   Loop Start
                                                    (MPPT)

                                           Sample Battery Current
                                                  I_B(n)

                                Yes                                                       No
                                                      I_B(n) >
                                                      I_B(n-1)

                 Increment PWM                                                             Decrement PWM
                 Duty Cycle Count                                                          Duty Cycle Count

                                      Figure 4. MPPT Algorithm Flow Chart

             Charge < 20%                                                             Charge > 95%
                                             State of Charge

                                 Charge > 70%

 Fast Charge                                     Topping Charge                                  Float Charge
  CC Mode                                           CV Mode

                                          Short

                                        Safety Test

                                      Temp               Open                                                 Fault Wait

                                    Figure 5. Battery Management Flow Chart

SLPA013 – October 2014                                     Hybrid Battery Charger With Load Control for Telecom Equipment    7
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Software Flow                                                                                                      www.ti.com

                                                           ADC Interrupt
                                                           Every 100 ms

              Run MPPT                                                                         Run CC/CV
            Charging Loop                                                                     Charging Loop
            if Solar Panel                                                                      if Adapter
               Powered                                                                           Powered

                                                                                                   Run Battery
            Run Load
                                                                                                   Management
         Management Loop
                                                                                                      Loop

                                                           CPU Idle
                                                            State

                                              Figure 6. Control Loop Logic

8     Hybrid Battery Charger With Load Control for Telecom Equipment                                     SLPA013 – October 2014
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5      Schematics
                       PANEL CONNECTOR
                                                                                                                                       BATTERY CHARGER CIRCUIT
                                                                       R12                                                                                     Q4                                                          L2
                                                      P+                                                         VP                                                                                                                                                                                                                   CONV_OUT
                      J2                                               10 mΩ                                                                                CSD87350Q5D                                                 10 µH
                 CONN-RMC-2PIN                                  1      2512 2                                                                               QFN5X6MM_DUAL                                                 DNP

                                1                                                                                                                1 VIN1                   VSW3          8                           2                1
       CONN-RMC-2PIN                                                                                                                                                                                                                                                                                           R30
                                                                1              2                                                                                          VSW2          7                                    L1                                                                            1             2
                                2                                                      C31        +                                                                                                                         10 µH
       CONN-RMC-2PIN                                R37                R13          1000 µF               C32                                    3                                      6                                                                                                                      10 mΩ
                                                    20 kΩ              10 mΩ                              4.7 µF                                      TG                  VSW1                                      2                1                                                                         2512
                                                    R603               2512                                                                      4                                      5                           IND_74436xxxx
                                                                                                                                                                                                                                                                                                                                            BAT+
                                                                                                                                                      TGR                       BG
                                                                                                                                                                      PGND                  BAT+                    R14          C11                     + C12              C13         C15        C16         R31

                                                                                                                                                                                                             3.01
                                                                                                                                                                                                                                         +
                                                K                                                                                                                                                                   1206        47 µF                      47 µF            22 µF       22 µF      22 µF   1             2

                                                                                                                                                                  9
                                         D7                                                                                                                                                                               CAP_EEUCF                      CAP_EEUCF          C603        C603       C603
                                        LED                                                                                                                                          R44                                                                                                                       10 mΩ
                                                                                                                                                                                                                                                                                                               2512
                                                                         Q3                                                                                                          1 kΩ
                                                                    CSD17527Q5A                                                                                                                                     C14
                                                A

                                                                     QFN5X6MM       3                                                                                                                               2.2 nF
                                                                                    2                                                                                                        D10                    C603
                                                                       5            1                                                             C17               C19                      MMBZ5237
                       P-
                                                                                                                                                  1 µF            0.22 uF
                                                                                                                                                  C603            C603                                  R15                                                                                                                      U11
                             BAT+                                                                                                                                                                                                                                                                                                                      V3V3
                                                                                                                                       R16                                                              1206                                                                                                                   INA28xAID
                                                                                                                                       1206                                                                                                                                                                                         SO8
                                                                     R17        4                                                                              U7                                                                                                                                                    1                             8                  R27
                                                                                                                                                                                                                                                                                                   VP                        -IN            +IN               P+
                                                                     1 kΩ                                                                                   UCC27211_D_8                                                                                                                                             2                             7                  0Ω
                                                                     R603                                                                                                                                                                                                                                            3       GND          REF1     6                  R603
                                                                                                                                                      1                           8                                                                                                                                  4       REF2            V+    5
                                                                                                                                                      2    VDD             LO     7                                                                                                                                          NC            OUT
                                                                                                                                                      3    HB             VSS     6
                                                                                                                                                           HO               LI                                                                                                                                                                            IP_SNS
                                                                                                                                C18                   4                           5
                                                                C

                                                                                                                                                           HS               HI                                                                                                                                                                                         C24
                                                            B        Q5                                                         0.01 µF                                                                                                                                                                                                                                0.1 µF
               PAN_SW
                                                                     MMBT2222ALT1                                               C603                                                                                                                                                                                                                                    C603
                                         R32                         SOT23                                                                                                                                                                                                                                     PANEL CURRENT SENSE
                                                                E

                                         1 kΩ                                                                                                             R46 2 kΩ
                                         R603           R38
                                                                                                                   BUCK_PWM
                                                        10 kΩ
                                                        R603
                                                                                                                   SYNCB_PWM
                                                                                                                                                          R45 2 kΩ
                                                                                                                                                                                                                                                                                                                                 U13
                                                                                                                                                                                                                                                                                                                                                       V3V3
                                                                                                                                                                                 C33           R43      R42         C34                                                                                                        INA28xAID
                                                                                                                                                                                               DNP      DNP                                                                                                                         SO8
                                                                                                                                                                                                                                                                                                                                                       CONV_OUT
                                                                                                                                                                                 100 p                              100 p                                                                                            1                             8                  R28
                                                                                                                                                                                                                                                                                                 BAT+                        -IN            +IN
                                                                                                                                                                                                                                                                                                                     2                             7                  0Ω
                                                                                                                                                                                                                                                                                                                     3       GND          REF1     6                  R603
                                                                                                                                                                                                                                                                                                                     4       REF2            V+    5
                                                                                                                                                                                                                                                                                                                             NC            OUT
                  ADAPTOR CONNECTOR                                                                                                                                                                                                                                                                                                                       IBAT_SNS
                                                                                                                           P+
                                                                                                                                                                                                        VP                                                                                                                                                             C26
                                                                                                                                                                                                                                                                                                                                                                       0.1 µF
                                                                                                                                                          R52                                                                                                                                                                                                           C603
                                                                                                                                                          70 kΩ                                                                          R56
                                          1                                                                                                   R47                                                                                        70 kΩ
                 CONN-RMC-2PIN                                                      VP
                                                                                              Q6                                              74 kΩ                                                                          R53                                                                     CONVERTER OUTPUT CURRENT SENSE
                                                                                         CSD17527Q5A                                          R603                                                                           74 kΩ
                                          2                                                   QFN5X6MM       3                                            2N2907A                                                            R603
                 CONN-RMC-2PIN                                                                               2                                            Q8                                                                             2N2907A
                                                                                              5              1                                                                                 VP_SNS                                    Q9
                                            BAT+
                                    CONN-RMC-2PIN                                                                                                                                                                                                                                  VADP_SNS
                                         J3                          R26                                                                                                                                                                                                                                                         U15
                                                                          ADP-                                                                                                                                                                                                                                                                         V3V3
                                                                     1 kΩ                                                                                   R51                                                                                                                                                                INA28xAID
                                                                                                      4

                                                                                                                                                                            S

                                                                     R603                                                                     R48           10 kΩ                                                                            R55                                                                                    SO8

                                                                                                                                                                                                                                                           S
                                                                                                                                              10 kΩ                                                                          R54             10 kΩ                                                                   1                             8          BAT+    R29
                                                                                                                                                                                                                                                                                                VLOAD                        -IN            +IN
                                         R34                                                                                                  R603                                          D11                              10 kΩ                                                                                   2                             7                  0Ω
                                         1 kΩ                                                                                                                                                                                R603                                           D12                                      3       GND          REF1     6                  R603
                                                                                                                                                                                            BAT54S
                                                                C

                            AC_SW                                                                                                                                                                                                                                                                                            REF2            V+
                                         R603                                                                                                                                               SOT-23                                                                          BAT54S                                   4                             5
                                                            B        Q7                                                                                                                                                                                                     SOT-23                                           NC            OUT
                                                                                                                                                                      A

                                                                                                                                                                                 C

                                                                     MMBT2222ALT1
                                                                                                                                                                                                                                                                                                                                                          ILOAD_SNS

                                                                                                                                                                                                                                                     A

                                                                                                                                                                                                                                                                 C
                                                                     SOT23
                                                                                                                      P-
                                                                E

                                                                                                                                                                                                     ADP-                                                                                                                                                              C28
                                                       R39                                                                                                                                                                                                                                                                                                             0.1 µF
                                                                                                                                                                                                                                                                                                                                                                        C603
                                                       10 kΩ
                                                        R603                                                                                                                                                                                                                                               LOAD CURRENT SENSE
                                                                                                                                                                                     V3V3

                                                                                                                                                                                                                                                                     V3V3
                                                                                                                                                          PANEL AND ADAPTOR VOLTAGE SENSE

SLPA013 – October 2014                                                                                                                                                                                                                        Hybrid Battery Charger With Load Control for Telecom Equipment                                                                 9
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Schematics                                                                                                                                                                                                                                                                                                                                                                         www.ti.com
                                                                                          LOAD CURRENT CONTROL
                                                                                                                                                                                                                                                                                                                                                                                  V3V3
                                                                                                                                                          LOAD_ENABLE                                                                                                                                               TEMPERATURE SENSOR
                                                                                                                                                                                                                                                                                                                                                                                                    R6
                                                                                                                                        R5                                                                                                                                                                                                                                                          1 kΩ
                                                                                               U1                                       10 kΩ                                                                                                                                                                                   R4                               U2                                 R603
                                                                                          TPS25910RSA                                   R603                        R2                                                                                                                                                          26 kΩ                          TMP709
                                                                                                RSA-16                                                              20 kΩ                                                                                                                                                                          1                          5
                                                                                    1                              16                                               R603                                                                                                                  R7                 R8                                           SET           VCC
                                                                                         VIN1                EN                                                                                                                                                                           100 kΩ             200 kΩ             R603               2
                                                                                    2                              15                                                                                                                                                                     R603               R603                                         GND
             VLOAD                                                                       VIN2               FLT                                                                                                                                                                                                                                    3                          4            C2
                                                                                    3                              14                                                                                                                                                                                                                                     OT        HYST                   100 nF
                                                                                         VIN3           GND6                                                                                                                               LOAD_ENABLE
                                                                                                                                                                                                                                                                                                                                                                DBV_5                      C603

                                                                                                                                                                                                                                                                                      C
                                                                                    4                              13
                                                                                         GATE           GND5                                                                                                                                                                                 B
                                                                                    5                              12                                                                                                                                                                       Q2
                              C6                       R1                                GND1           OUT2                                        Q1          8                                                                                                                           MMBT2222ALT1
                                          C1
                   K

                                                                                                                                                                                                                                                                                      E
                              DNP         0.1 µF     40.2 kΩ                        6                              11                          CSD17313Q2       6                                                                                 J5                                        SOT23
          D1                   +          C603       R603                                GND2           OUT1                                     SON_2X2MM      5                                                                              CONN-RMC-2PIN
        SMAJ20A                                                                     7
                                                                                         ILIM               OUT
                                                                                                                   10                           4               2                      12 V at 4.5 A                          VOUT

                                                                                                 PWPD
          SMA                                                                                                                                   7               1
                              CAP_EEUCF

                                                                                                                                                                                                        K
                                                                                    8                              9                                                                                                                        1              CONN-RMC-2PIN
                   A

                                                                                         GND3           GND4                                                                                                D2
                                                                                                                                                                              C4           + C3             MBR130

                                                                                                17
                                                                                                                                                                              0.1 µF            47 µF       D_SOD123                        2

                                                                                                                                                      3
                                                                                                                                                                              C603              CAP_EEUCF
                                                                                                                                                                                                                                                           CONN-RMC-2PIN

                                                                                                                                                                                                        A
                                                                                                                                                                                                                              AGND

                                                                                                                                                                                                                                                                                                                                                       R33
                                                                                                                                                                                                                              LOAD CONNECTOR                                                                                                           10 mΩ
                                                                                                                                                                                                                                                                                                                                                       2010
                                                                                                                                                            C5
                                                                                                                                                            DNP                                                                                                                  CONN-RMC-2PIN                      1       BAT+
                                                                                                                                                             C603                                                                                                                                                                                                                  VLOAD
                                                                                                                                                                                                                                                                                                                                                       R11
                                                                                                                 U3                                                                                                                                                                                                 2                                  10 mΩ
        VP             A2                                                                                   TPS738xxDCQR                                                                                                                                                         CONN-RMC-2PIN                                                         2010
                                                                                                                      DCQ
                                                 C                                                      1                        2                                                                  V3V3                                                                                                     J1
                                                                                                             IN        OUT                                                                                                                                                                              CONN-RMC-2PIN
        BAT+           A1                                                                               5                                      R9
                                                                                                             EN
                                                                                                                   GND1

                                                                                                                                               6.8k
                           D6                                                                           3                        4             R603          C8             C9
                         BAT54C                                                     R3                       GND            FB                               10uF           0.1uF                                                                                                                          BATTERY CONNECTOR
                         SOT-23              C10                          C7        0Ω                                                                       C603           C603
                                                                                                                  6

                                             10 µF                       0.1 µF     R603
                                             C603                        C603

                                                                                                                                               R10                                                                                                     V3V3                    BAT+
        IBAT_SNS                                                                                                                               4k
                                                                                                                                          R603

         IP_SNS                                                                                                                                                                                                                                 J4
                                                       R40                                                                                                                                                                                 CONN-4P-TOPENTRY                                      R18
                                                       0Ω                                                                                                                                                              R22                                                                       46.8 kΩ
                                                       R603                                                                                                                                                            47 kΩ                1                                                    R603
                                                                   V3V3
                       R36                                                                                                                U5                                                                           R603
                       0Ω                                                             C21                                            MSP430F5132IDAR
                       R603                                                         0.1 µF                                              DA_38P                                                                                              2                                                                                                   VBAT_SNS
                                                                                        C603                            1                                            38                             ILOAD_SNS
                                                         C29                                                            2    AVCC                  P3.6              37
                                                                                                                             PJ.4/XOUT             P3.5                                VADP_SNS
                                                        2.2 nF                                                          3                                            36                                                                     3
                                                            C603                                                        4    PJ.5/XIN NMI/SBWTDIO_RST                35

                                                                                                                                                                                                                                                                                                                            S
                       C23                                                                                              5    AVSS         SBWTCK/TEST                34                                                                                                                          R19           C25
                                                                         VBAT_SNS                                            P1.0                  P3.3
                       2.2nF                                                                                            6                                            33                                                C22                  4                                                    10 kΩ         10 nF
                       C603                                                                                             7    P1.2                  P3.2              32                                                2.2 nF                                                                    R603          C603                           D9
                                                                           VP_SNS                                            P1.1                  PJ.6
                                                                                                                        8                                            31                             V3V3
                                                                                                                                                                                                                       C603                                                                                    DNP                            BAT54S
                                                                                                                        9    P1.3                DVCC                30                                         R35                                                                                                                           SOT-23
                                                                                                                       10    P1.4               DVSS2                29       C20      470 nF                   47k

                                                                                                                                                                                                                                                                                                                        A

                                                                                                                                                                                                                                                                                                                                  C
                                                                                                                       11    P1.5              VCORE                 28       C603                            R603
                                                                                                                             PJ.0                  P3.1                                           AC_SW
                                                                                                                       12                                            27
                                                                                                                             PJ.1                  P3.0                                           PAN_SW
        ILOAD_SNS                                                                                                      13                                            26
                                                                                                                       14    PJ.2                  P2.7              25
                                                                                                                       15    PJ.3                  P2.6              24
                                                                                                                             P1.6                  P2.5

                                                                                                                                                                                                                                                                                                                                       V3V3
                                                               BUCK_PWM                                                16                                            23                                                                                                 R24
                         R41                         R25                                                               17    P1.7                  P2.4              22                                                                         R23                     1 kΩ
                                                               SYNCB_PWM                                                     P2.0               DVSS1
                         0Ω                          1 kΩ                                                              18                                            21                            V3V3                                         1 kΩ
                         R603                        R603                                                              19    P2.1                 DVIO               20                                                                         R603                  R603
                                                                                                                             P2.2                  P2.3                                           LOAD_ENABLE                                                                             BATTERY VOLTAGE SENSE
                                                 A

                                                                                                                                                                                                                                           A

                                                                                                                                                                                                                                                                  A
                                                               AC_CHRG

                                                                                                                                                                                                                                 LOW_BAT

                                                                                                                                                                                                                                                       BAT_CHRG
                                                      D5                                                                                                                                                                                         D3                      D4
                         C30                          LED
                                                                                                                  CONTROLLER SECTION                                                                                                             LED                     LED
                         2.2 nF
                         C603
                         DNP
                                                 K

                                                                                                                                                                                                                                           K

                                                                                                                                                                                                                                                                  K

10   Hybrid Battery Charger With Load Control for Telecom Equipment                                                                                                                                                                                                                                                                                  SLPA013 – October 2014
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6      Test Results

                            Figure 7. Variation of the Duty Cycle from the Controller

                                Figure 8. Seamless Transfer from Panel to Adaptor

SLPA013 – October 2014                                      Hybrid Battery Charger With Load Control for Telecom Equipment   11
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                                    Figure 9. Output PWM Pulses from UCC27211

                                  Figure 10. Load Switch Response to Short Circuit

12     Hybrid Battery Charger With Load Control for Telecom Equipment                                 SLPA013 – October 2014
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                Figure 11. MSP430 Fast Trip Comparator Response to Load Short Circuit (EN)

SLPA013 – October 2014                                   Hybrid Battery Charger With Load Control for Telecom Equipment   13
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