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LM5051: is there recommended external driver circuit to increase gate charge current?

Max Han
Intellectual 2260 points
Part Number: LM5051

Hi 

in LM5051 datasheet, gate charge current is only 0.28mA ~ 0.95mA.

customer think it is not enough because this is a resistor added between Gate and Source of MOSFET in customer's circuit.

customer want to check with us that is there recommended external driver circuit to increase gate charge current?

thanks.

  • 0
    TI__Genius 16305 points
    Hi Max Han,

    Let me check on having an external circuit to increase the gate drive current.

    Can you let me know by how much customer wants to increase the gate drive current?


    Regards,
    Kari.
  • 0 in reply to Karikalan Selvaraj
    TI__Intellectual 2260 points
    Hi Kari,
    customer has no exact data for this current.
    in customer's circuit, 5 MOSFETs are parallelling, so LM5051 is used to drive 5 MOSFETs.
    i think the min current should be 50mA or larger?
  • 0 in reply to Max Han
    TI__Genius 16305 points
    Hi Max Han,

    Increasing the gate drive to close 50mA will require a lot of external components, it would be better to have a completely discrete solution for with comparators and amplifiers, circuit similar to internal block diagram of LM5051 needs to be externally made.

    But, for driving multiple MOSFET in parallel, we recommend to drive two MOSETs with one LM5051 and next two MOSFETs with another LM5051 and scale it up accordingly.

    Let us know your thoughts here or comments on this approach.

    Regards,
    Kari.