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DRV8432 - Question on Overcurrent Protection

John Cole
Intellectual 340 points

I am configuring the DRV832 in a design for differential operations on two motors.  For each of these motors, I want to limit the total current to 6A (neither motor should be limited to 6A).  I'm assuming I can set the OC resistor to between 43-47k and this will limit either motor from going over the 6A threshold.  Is that a correct assumption?

Does OC protection at a certain amperage apply to both full-bridges individually or does it apply to the entire motor controller unit?

Thanks for the help TI Team!

  • TI__Prodigy 315 points

    Hi John,

    The current limiting and overcurrent protection functions on the DRV8432 are independent for each half-bridge.

    In the application you've described your assumption is correct - choosing the resistor between 43-47K would current - limit the output of each bridge to 6A. However, since the limiting circuitry is independent for each bridge, a total of 12A is possible through the device (6A through each motor) if, for instance, both motors were to stall at the same time.

    Hope this helps, let us know if you have any other questions!

    Best regards,
    Casey