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DRV8334: Benefits of changing IDRVP relative to IDRVN

Jonathan Fritsch
Prodigy 130 points
Part Number: DRV8334

Tool/software:

Hello,


I'm wondering why for a given design I might want to have a different IDRVP and IDRVN, given both directly tie into di/dt and how much EMI my inverter will create as VDS changes from FET turn-on/turn-off, and what benefits there might be in using this capability.

  • +1
    TI__Genius 12231 points

    Hi Jonathan, 

    Thank you for your question. 

    There are a few major reasons having this level of control is useful, but arguably the most important reason is that there may be circuit dynamics resulting from FET choice, PCB layout, and other power-stage components that may affect the drivers capability to pull-up or pull-down a powerstage FET, and having this independence of IDRVP/N allows for optimization.

    Having this ability to tune your gate-drive current independently allows for the user to minimize ringing and EMI in cases where the pull-up and pull-down strengths currents can be closer in value together, or in situations where having a minimized pull-up current while needing additional pull-down current is necessary.   This differs from most of our other DRV devices where source and sink current are linked and sink current is typically 2x source current. 

    I hope this information is helpful in understanding the benefit of independent control.

    Best Regards,

    -Joshua