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DRV8711: About drv8711's Low side gate resistor

LI Iwan
Intellectual 270 points
Part Number: DRV8711

Hello,

Because the early version of the drv8711's manual did not have this resistance,So the customer want to know how does the low side gate resistor work to ruduce predriver fault due to noise in the system.

Thanks a lot!

  • 0
    TI__Expert 4435 points
    Hello Li Iwan,
    At very high current and voltage switching the gate for the low side might be prone to see some noise from the other bridge and create a fake fault. Since this is a stepper driver, at the moment one of the bridges is at zero current the other bridge is close to max current so the weak gate might see this false fault. To prevent this the resistor from 47 to 120Ohms is recommended to hold the gate. I hope this helps, thank you.
  • 0 in reply to Luis Riveros
    Intellectual 270 points

    Dear Luis Riveros,

    The attachments are the waveforms of customer grabs,please help to analysis with the waveforms how does the low side gate resistor work?

    Thanks