This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LM5113: Negative Output Bias with the LM5113

Part Number: LM5113

One good solution to mitigate ring/oscillation with GaN FETs is using a negative gate bias (-3V) for turn-off. You have devices that accomplish this (LM5110), however, I strongly desire the half-bridge driving capability of the LM5113

Is it possible to configure the LM5113 to drive with a negative gate bias? For example, could I simply just lower the ground potential of the gate driver 3V relative to the half-bridge ground, essentially treating the "GND" pin on the LM5113 as a "VEE"

Appreciate the support!

16 Replies

  • In reply to Alberto Doronzo:

    Alberto,

    Were you able to determine a feasible solution to the problem above?

    Regards,
    Joel
  • In reply to Joel Barker:

    Hi Joel,

    I can confirm that the part will behave properly if you build a circuit as previously described.

    We are in the process of updating the model to reflect this behavior.

    Best regards,

    Alberto

  • In reply to Alberto Doronzo:

    Great! Please let me know when the model has been updated. Are you able to verify that the LM5113 behavior in a lab?
  • In reply to Joel Barker:

    Hi Joel,

    yes I have confirmed the correct behavior in the lab, and I will notify you when we post the updated model.

    Best,
    Alberto
  • In reply to Alberto Doronzo:

    Thanks Alberto. Which components did you use when verifying in the lab? Any chance you have specific part numbers?

  • In reply to Joel Barker:

    Hi Joel,

    I have used a power supply and a large through-hole diode and I do not have specific part numbers, but any small generic LDO and schottky diode (with appropriate voltage rating) would work properly.

    Best regards,
    Alberto

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.