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BQ77915: voltage issue

Cherry Zhou
Mastermind 22235 points
Part Number: BQ77915

Hi team,

Issue: Charge the 5-string Li-ion battery with the BQ7791500, and the voltage across the pack drops to 13.4V after 16-V undervoltage protection. Remove load + charge, cannot recover and cannot charge battery.

Could you help check this case? Thanks!

Best Regards,

Cherry

  • 0
    TI__Mastermind 34450 points

    Hello Cherry,

    UV protection should keep the CHG FET on, allowing charge to go through. Can they see if the CHG FET or DSG FET is on? See Table 9-5 in the datasheet for fault condition description.

    I find it strange that the battery pack voltage would get that low. Which part number are they using? None of the BQ77915 offer UV protection at 16-V (See Section 6 of the datasheet).

    Best Regards,

    Luis Hernandez Salomon