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BQ76942: Precharge FET turn off delay

Fabio Gou
Expert 4375 points
Part Number: BQ76942

When predischarge mode is exited and DSG is turned on after configured timeout.

I want to know when the DSG is turned on, after how much time PREDISCHARGE FET will be closed?

The customer said it is always near 250ms in their experiments.

Could you pls help to double confirm the turn off delay from the FW team?

  • 0
    TI__Expert 4085 points

    Dear Fabio,

    Yes, that is correct. 250ms is the correct amount of time. A large number of the internal functions like turning the FETs on function on 250ms cycles. Most of time though, the number isn't critical as even if PDSG stays on for an extended time, most of the current will be flowing through DSG so there won't be much power wasted. Hope this helps!

    Best,

    Asher Nederveld