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BQ76972: Short circuit protection delay

TISL
Expert 4105 points
Part Number: BQ76972

Tool/software:

Dear e2e support,

Our BMS is able to drive the high side protection (DSG turnoff) in 10µs.

But what is the overall time needed to react to a short circuit (short detection + internal delay + DSG drive)? are we able to react in less than 100µs?

Regards,

  • +1
    TI__Mastermind 35730 points

    Hello TISL,

    This would depend on settings and which/how many FETs are being used. 

    At the fastest SCD delay setting and depending on how large is the short circuit current is vs. the SCD threshold setting, it could be the following (Excerpt from datasheet):

    Then after that the part would quickly turn the FETs OFF. This would depend on many different factors. But the datasheet provides a fall time associated with a specific condition:

    Overall, it is definitely possible to reach sub-100us turn-off speeds after short-circuit detection. But the exact timings would depend on their specific system.

    Best Regards,

    Luis Hernandez Salomon