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DRV8870: Does DRV8870 have a parameter for the back electromotive force?

user3830479
Expert 1090 points
Part Number: DRV8870

Dear all:

      We consider using DRV8870 for smart toilet motor control, Does DRV8870 have a parameter for the back electromotive force?

  If someone forcibly turns the motor from positive to negative, can the IC be protected?

  • 0
    TI__Guru 56650 points

    User3830479,

    DRV8870 cannot report the back EMF. If someone forcibly turns the motor from positive to negative, a snubber or a voltage clamp circuit should be added to the input to protect the IC.

  • 0 in reply to Wang5577
    Expert 1090 points

    Dear wang Li:

        Thanks!  Can you help provide a snubber or a voltage clamp circuit for us?   It is for output or input?  I think it add in output PIN？

  • 0 in reply to user3830479
    TI__Guru 56650 points

    The back EFM can charge input capacitor voltage up through the switching FET's body. So, the system only needs one clamp circuit at input. If you put it at output, you may need two clamp circuit.

    Please search "tvs diode" and select a correct clamp voltage and current rating. And then, put it on your input.

  • 0 in reply to user3830479
    TI__Guru 56650 points

    The back EMF can charge the input capacitor voltage up through the switching FET's body. So, the system only needs one clamp circuit at input. If you put it at output, you may need two clamp circuits.

    Please search "tvs diode" and select a correct clamp voltage and current rating diode. And then, put it on your input.