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I want to drive a 300v IGBT half bridge that uses two n channel IGBT's. The problem is I need to a bootstrap when driving the IGBT that pulls the load to high, however the IGBT's max gate-emitter voltage is 20 volts, not 300. I guess I could use a high value resistor, but I was wondering if I could instead connect my bootstrap capacitor to a lower voltage than vcc? I don't see why it wouldn't work, but I haven't found anything on the internet about it.

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    \$\begingroup\$ Yes, hook your bootstrap cap from some voltage lower than 20V to the switch node. \$\endgroup\$ – John D Aug 31 '18 at 0:23

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