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DRV8871: Using 24V and 12V DC motors

Part Number: DRV8871

Hi

I have tested motor driver(DRV8871).

And it was working good when connecting 12V DC motor.

But when I changed 24V motor(Vm:24V) It isn't working.

Please let me know check point.

It is working when supply 24Vdc source for motor without DRV8871.

  • Hi Mason,

    It may be that you are experiencing an overcurrent event. Please look at the outputs using a scope.

    The outputs should turn on for a few microseconds then turn off (Hi-Z) for approximately 3ms (tretry). If this is being seen, look for a capacitor in parallel with the motor winding. The capacitor could be placed inside the motor housing.

    If there is no capacitor, what is the RREF resistor value?
    What is the inductance and resistance of the motor?
  • Thank you for your support.
    Your comments is very helpful.