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LM5117: LM5117

SUDHANSHU TELRADHE
Intellectual 300 points
Part Number: LM5117


Hi,

I am disabling internal VCC regulator of LM5117 IC by setting VCCDIS pin at 1.5 Volt & connecting external 5 Volt supply to VCC pin. Because I want gate driver voltage of LM5117=5 volt. Will this setting work?I am using LM5117 IC for driving eGAN FET EPC2020 GaNFET switch. This switch require Vgs=5V. can I set VCC pin of LM5117 equals to 5V externally to drive GaNFET.

  • 0
    TI__Genius 11040 points
    Hi,

    I will forward your question to the product expert, and we will follow up with you.

    Best Regards,
    Katelyn
  • 0
    TI__Guru* 77252 points

    Hi Sudhanshu,

    I noted the VCC rising threshold is 5.15V max from the EC table in the LM5117 datasheet. My understanding is that this still applies if VCCDIS is disabled.

    Also, given the sensitivity of GaN devices to overvoltage on the gate, I would not recommend driving directly with the LM5117. There is a significant risk that the boot cap overcharges, particularly as the SW voltage can go negative.

    Regards,

    Tim