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DRV8432 peak output current question

Steve Dunn1
Intellectual 395 points

All,

in datasheet page 2 for the DRV8432 for absolute maximum ratings it states 20amp for transient peak output current for latch shut down per pin and 16amp for transient peak output current pulse width limited by internal over current protection circuit.

my question is: for how much time or how wide is this pulse width that is mentioned? and why i not see it on my scope or dvm? is it in nano, micro, milli or full seconds?

also in recommended operating conditions on same page it states that the Io_pulse = pulsed peak current per output pin limited by thermal is 15amp.

again my quesiton is for approx how long can i expect this 15amps on output pin?

-Steve

  • 0
    TI__Expert 8885 points

    Steve,

    16Amp ratign is for cycle by cycle limit case and IOCT time is 250nsec, (spec on sheet-7)  that means current pulse width can be250nsec for cycle-by-cycle limit case. If during this time current goes beyond 20Amp, device will hit latch protection.

    Both of above rating are absolute max, whereas recommended rating mentioned as 15Amp. However, depending upon the thermal impedance of heat-sink, device may hit over-temperature  protection berfore reaching these over-current limits, let's say at 10 or 12Amp for example, that's why it is mentioned as limited by thermal.

    Best Regards

    Milan-Motor Application Team