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DRV8870: overcurrent deglitch time

Amber Si
Prodigy 630 points
Part Number: DRV8870

Hi team,

How to understand OC deglitch time 1.5us in datasheet? It means when current is over 3.7A, but device will not trigger OCP immediately, and FET can stand >3.7A current for ~1.5us with FET never being broken down?

Best regards,

Amber

  • 0
    TI__Expert 5980 points

    Hi Amber, 

    Yes, the OCP will trigger at some value between 3.7 A and 6.4 A if that current stays above the threshold for the overcurrent deglitch time. 

    If the output current exceeds the OCP threshold, IOCP, for longer than tOCP, all FETs in the H-bridge are disabled for a duration of tRETRY. After that, the H-bridge is re-enabled according to the state of the INx pins. If the overcurrent fault is still present, the cycle repeats; otherwise normal device operation resumes.

    Best,

    David