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DRV8320: if Vm power is lost with inputs still at 5 Vdc will the DRV still be OK?

David Wilson3
Prodigy 20 points
Part Number: DRV8320

My circuit board has two power supplies. One for the DRV8320 of 36 Vdc and another 5 Vdc regulated supply. I wish to know if the DRV chip can handle a power loss at Vm from our 36 Vdc while the PICT processor interfacing with the DRV chip is still alive. That is, will the DRV chip be OK if VM power is lost and the DRV inputs are still powered? I want to use this dual power supply system so that if Vm power fails, the PICT processor can still perform diagnostics. Dave Wilson

  • 0
    TI__Guru 65320 points

    David,

    It is not recommended to send any signals to the DRV if the main power is removed. What I would do is monitor the nFAULT pin using your MCU and use this as a gating input for the MCU sending signals to the DRV. This way if there is a fault or the DRV is shut down your MCU will know and stop sending signals to the DRV.

    Regards,

    -Adam

  • 0 in reply to Adam Sidelsky
    Prodigy 20 points

    Thanks Adam. We thought there might be a problem. We may try to keep the DRV alive with regulated 5 Vdc to Vm when 36 Vdc is lost. THank you for your help. Cordially, Dave