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DRV8302 produces fault and gets hot

Dirk Paulus
Prodigy 20 points
Other Parts Discussed in Thread: DRV8302, CSD18535KCS

Hi everyone,

I am using the drv8302 mosfet driver with CSD18535KCS Mosfets. The circiut works really well for serveral days. But now for the second time the drv8302
switches to fault when I enable the PWM, then the driver gets really hot. First time i replaced the driver and erverything was ok but now I have the same problem.
The supply voltage was 30V and the problems occurs always for currents higher 10A.  

I have no idea of the reasen why the drv8302 is damaged and would be really happy for some ideas of the reason.

Two pictures of the schematics are added

Best regards Dirk 

  • 0
    TI__Guru** 114905 points
    Hi Dirk,

    Thank you for providing the schematics. The schematic looks good, but there is one question. What is the total of the bulk capacitors C107 and C108?

    When running at ~8A, have you looked for voltage spikes on PVDD? Inadequate bulk capacitance could allow large voltage spikes.

    Which fault is asserted (FAULT, OCTW, or both)?
  • 0 in reply to Rick Duncan
    Prodigy 20 points

    Hi Rick,


    thank you for your reply. Each capacitor has a value of 1000µC. Only the Fault pin asserted.

    In the meantime I reconized that the voltage source produced an undervoltage because of the current limitation.

    Is it possible, that his can damage the chip?

    Best regards

    Dirk

  • 0 in reply to Dirk Paulus
    TI__Guru** 114905 points
    Hi Dirk,

    An undervoltage condition should not damage the device directly. It could indirectly if the event causes PVDD to exceed the absolute maximum voltage.

    Is it possible to create the same event at a lower voltage and monitor the PVDD voltage when this occurs? If you see a large voltage spike that could indicate the undervoltage was a contributing factor.