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LM5050-1: How to adjust Vgs?

Yuan_1980
Intellectual 410 points
Part Number: LM5050-1

Hi experts, 

I want to adjust Vgs to 8V, Could you please suggest how to do this？ I tried to modify below R1, but no use.

  • 0
    TI__Genius 16305 points

    Hi

    Gate voltage of MOSFET is controlled by LM5050-1 based on the load current.

    At light load, gate voltage will be close to MOSFET Vth and at high load current, gate voltage will be high.

    This is due to the linear regulation control mechanism. It is not possible to fix the gate voltage to 8V at all conditions.

    If you wish to clamp gate voltage to 8V, you can add a zener clamp from gate to IN pin to clamp it to a known maximum value.

    Regards,

    Kari.