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BQ25792: BQ25792 sys output abnormal

Star Xu
Genius 9645 points
Part Number: BQ25792

Hi 

My customer design the schematic with BQ25792. the sys output abnormal when the battery remove.

the input voltage is 15V,the SYS output waveform as below.



Please give some suggestions with this problem.

Thanks

Star

  • 0
    TI__Guru**** 167196 points

    Hi Star,

    With no battery attached, the recommended minimum capacitance on SYS and BAT and charge enabled, BAT voltage overshoots as the charger chargers up the BAT capacitance.  This results in the converter BATOVP tripping and shutting down momentarily.  To prevent this, the user can disable charge when the battery is removed or add more capacitance on BAT.

    Regards,

    Jeff