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DRV8412: Short transient spikes and Absolute Max Ratings

Assad Bahari
Prodigy 90 points
Part Number: DRV8412

Hello everyone,

I have a question regarding the DRV8412. While being used in a specific design, very short transient spikes (10 ns) appear on the OUT_X node. The absolute max ratings table in the datasheet says that it should not go less than -0.3 V but in this design around -1.98 V is being measured. Is the DRV8412 able to handle such short transient voltage spikes or would it definitely damage the DRV8412 with this voltage? As it is beyond what the max ratings table recommends.

Thank you.

  • 0
    TI__Guru** 114905 points

    Hi Assad,

    Can you provide a scope capture of the voltage spikes measured at the OUT_x node with respect to the GND pin of the DRV8412?

  • 0 in reply to Rick Duncan
    TI__Prodigy 90 points

    Hello Rick,

    The customer has provided me with this picture:

    Here you can also see the voltage spike that they mention. I hope this helps.

  • 0 in reply to Assad Bahari
    TI__Guru** 114905 points

    Hi Assad,

    Thank you for the scope capture. I am sorry. I asked for the wrong capture.

    Can you provide a scope capture of the voltage spikes measured at the OUT_x node with respect to the GND_x pin of the DRV8412? If OUT_1 is measured, then it should be referenced to GND_1.

    Also, is there a sense resistor between the GND_x pin and GND. If so, what is the value?

    A voltage of -1.9V does not make sense, but a voltage of ~-1V at OUT_x with respect to GND_x does. This is the forward diode voltage when the current is flowing through the body diode. This is acceptable.