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Original question:

UCC21521: Isolated Gatedriver needed for new inverter design

UCC21542: UCC21542DWKR - Bootstrap Capacitor for switching STGP10H60DF IGBT at 60Hz

Navami Srinivas Prabhu
Prodigy 10 points
Part Number: UCC21542


Tool/software:

Hi, I need an isolated gate driver that drives the gate of this IGBT - STGP10H60DF at 60Hz switching frequency. How big should the bootstrap capacitor of UCC21542DWKR be for this case? I think it is very large (>50uF), so is there a workaround for this problem, since I would like to minimize the capacitance of both Cboot and the VDDB decoupling capacitor? Please advise. Thanks!

  • 0
    TI__Expert 3055 points

    Hello,

    You can use these equations to calculate the necessary minimum Cboot for your application. Please note that this is an absolute minimum, so make sure not to use a capacitor below the calculated value.

    Best regards,

    Will