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DRV8300: The impact of serial resistance on the SHx pin of the pre drive chip？

wang shaohua
Prodigy 10 points
Part Number: DRV8300

Tool/software:

Hello, experts！

  We have a project here that uses TI's DRV8300 pre drive chip. Now, the hardware engineer insists on stringing resistors on the SHx pin (as shown in the picture), saying that this can eliminate the Miller platform of the gate drive voltage waveform. However, no one has done this before. I would like to ask if it is feasible and if there are any risks?

  • 0
    TI__Mastermind 23546 points

    Hey Wang,

    I will aim to provide feedback next week.

    Best,

    Akshay

  • 0 in reply to Akshay Rajeev Menon
    TI__Mastermind 23546 points

    Hey Wang, 

    The SHX resistor will act as a current limiting resistor in the turn off off the MOSFET since it is in the return path for the sink current. Usually we see this resistor being placed near the diode. Would you be able to explain what extra benefit placing this resistor on the SHx path offers?

    I am not sure how this would "eliminate miller plateau" as this essentially is a way to slow down the discharge of the FET. Also The miller region is where the MOSFET slews and has big voltage change, so by not entering miller plateau you don't turn on the FET fully which will not be effective for practical application.

    Would you be able to clarify the goal a little bit more as I am not fully following this?

    Best,

    Akshay