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LMG3422R050: Freewheel current

Ernest Yong
Expert 4315 points
Part Number: LMG3422R050

Hi Team,

Would like to clarify a question about the characteristic of GaN.

If we do not have any "body diode" in GaN, how does it handle the freewheel current?

Thanks!

Best Regards,

Ernest

  • +1
    TI__Expert 8960 points

    Hello Ernest,

    This paper may be helpful: www.ti.com/.../snoaa36.pdf

    When a reverse voltage begins to build across the device, the source and drain switch places. In this case, there is now a Vgs voltage with the new source (normal drain), though the gate is being held at 0V relative to the normal source. It is typical to have a reverse voltage of several volts with GaN. For this reason, dead time optimization is critical in order to optimize efficiency.

    Thanks,

    Travis