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DRV8432: Overcurrent detection

Timothy Luca
Intellectual 790 points

Part Number: DRV8432

The overcurrent threshold is set by a resistor, but the table lists values for current output to 11.6Amps. However, the device says it can handle a peak of 15A. What if you need it to supply 13A very briefly - say for 100 milliseconds (Occurs once every minute). How long does it need to exceed the 11.6A threshold before it trips? Will this damage the device?

  • 0
    TI__Guru** 114905 points
    Hi Timothy,

    Typically the overcurrent trips in less than 1 us.

    Are you running the bridge in parallel mode? If you are, the 11.6A is really 23.2A.

    If you need more current, the DRV8701 or DRV8704 with external FETs may work depending on your voltage requirements. The FETs can be matched to your needs.
  • 0 in reply to Rick Duncan
    Intellectual 790 points

    Thanks very much for your response. We'd like to run with 48V, so your suggestion of the DRV8704 with external FETs would work. In our application, we are running a 3 phase BLDC. The current that exceeds 11.6A for <10 milliseconds - could we put a capacitor across the resistor that sets the threshold? Let's say that works - i.e. it prevents the tripping of the fault - will this be detrimental to the lifetime of the DRV8432?

    Thanks,
    Tim