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BQ25820: Schematic review

Part Number: BQ25820

Tool/software:

Hi TI experts,

Could you please help review below schematic for humanlike robot application.

BQ25820 SCHEMATIC1 05_Charger.pdf

1. Do not set the overvoltage charging cut-off voltage;
2. The undervoltage charging cut-off voltage is 47V;
3. Set the charging voltage to 41.9V;
4. The busbar current limit is 6A;
5. The charging current is 2.5A;
6. The charging input voltage is 44.8V~67.2V, and the battery is 10S ternary lithium

  • Hello Gary,

    Can you provide more information on this project? What customer is this for?

    Schematic review:

    • Input caps and output caps should be balanced across the sense resistors.The caps C44, C7 and C70 need to be spread and balanced across the sense resistors. The caps don't need to be exact. The ratio between the caps on both sides of the sense resistor can be as great as 1 to 10.
    • If customer is not using BATFET, the BATSRC pin should be connected to SRP.
    • Top resistor of VFB should be 249kohm, customer will need to adjust VFB diver to match required resistor value.

    1. Do not set the overvoltage charging cut-off voltage;
    2. The undervoltage charging cut-off voltage is 47V;

    Is ths for the input voltage or output voltage?

    6. The charging input voltage is 44.8V~67.2V, and the battery is 10S ternary lithium

    Your ACUV is configured for 47V, this will need to be changed.

    Best Regards,

    Christian.

  • Hi Christian,

    Thanks for your help.

    1. Do not set the overvoltage charging cut-off voltage;
    2. The undervoltage charging cut-off voltage is 47V;
              Is ths for the input voltage or output voltage?
                          It is for input voltage. Output voltage is stable of 41.9V.
    If customer is not using BATFET, the BATSRC pin should be connected to SRP.
              Can they connect BATSRC to SW2. SRP and SRN are pseudo-differential.
  • Hello Gary,

    It is for input voltage. Output voltage is stable of 41.9V.

    Okay, just checking.

    6. The charging input voltage is 44.8V~67.2V, and the battery is 10S ternary lithium

    Charger can not support 44.8V input, if ACUV is programmed for 47V.

      Can they connect BATSRC to SW2. SRP and SRN are pseudo-differential.

    Yes, That is okay.