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BQ25730: Motor drive issues

Andrew Newcomb
Prodigy 20 points
Part Number: BQ25730


Tool/software:

I am attempting to drive a motor with VSYS.  The motor inrush on startup is about 6A.  When VBAT is depleted or not connected, VSYS droops significantly and takes out my motor drive circuitry.  In addition to the recommended capacitance on VSYS, I have 2x 1mF aluminum electrolytics.  I have attempted maxing out IIN_HOST with no success.  Am I running into a limitation of the BQ25730?

  • 0
    TI__Mastermind 35435 points

    Hi, Andrew, 

    The input current limit is clamped by the IINHOST() register or the ILIM resistor divider, whichever is smaller. 

    To disable the input current limit, you can set EN_IDPM=0 in chargeoption0() register. 

    Regards,

    Tiger