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LMG1210: Half bridge with negative bias

Takeshi Sasaki
Expert 4480 points
Part Number: LMG1210

Hi team,

Could you give me comment on following customer questions?

Q1. Could you share reference designs of half bridge with negative bias? The drain of the high side GaN is connected to GND, and the source of the low side GaN is connected to -200V.

Q2. To confirm, when VSS is biased as -200V, each input pins (DHL, DLH, EN, PWM, VIN) are biased referred to the -200V. Is it correct understanding?

Best regards,

Takeshi Sasaki

  • +1
    TI__Expert 4070 points

    Takeshi-san,

    Thank you for reaching out!

    I think your questions should be answered in this post.

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    1)  We do, but only for our isolated gate drivers... which does not apply here due those parts having separate, isolated GNDs.  If you treat -200V as your GND and do all the math from that as your reference, you should be good.  As the above linked E2E post says, you will have to keep the HB-HS voltage in mind.

    2)  Yes, the IC input pins are referenced to VSS, therefore all the voltage specs must be met with the VSS voltage as reference (essentially treating it as GND)

    -------

    I hope this answers your question.  If so, please press the green button, or feel free to follow up with another question!

    Thanks,

    Aaron Grgurich