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LMG1020: LGM1020 EVM EPC2019 GND connection question

Wayne Wang20
Expert 4390 points
Part Number: LMG1020

Hi team,

My customer is evaluating our LMG1020. In the EVM schematic we noticed that the GND and PGND is connected as below picture in EPC2019. So I just want to check with you why the GND and PGND has to connect in this way. Do you have any document that could give a brief introduction on the benefit of this kind of connection? Thanks.

Best regards,

Wayne

  • 0
    TI__Genius 12990 points

    Hi Wayne,

    Thanks for reaching out on this one.

    Check out section2 from the following IGBT app note (however it still applies to GAN):

    it explains how a kelvin connection can help with common source inductance experienced at the source of the FET and the return of the gate loop.

    The kelvin connection taps off the source for the gate driver leaving the power train current through the channel substrate.

    does this make sense, let me know if you have any more questions.

    thanks,

  • 0 in reply to Jeffrey Mueller
    TI__Genius 12990 points
    Hi Wayne,

    Just checkin to see if you had any more questions about kelvin or GND connection.
    If this answer helped you, click the green button :)

    thanks,