I have the following MOSFET driver circuits for high side P-Channel MOSFETS. The circuit works for supply voltages up to 20 volts. It gives some satisfactory results for it's range, but I would like for it to work up to 80 volts. Assuming I have selected a P-Channel MOSFET that can withstand the voltage, what considerations should be made to the driver? What ratings should I select for the transistors?
I want the circuit to only draw current when the gate is actually being charged and discharged. My current setup draws current when the gate is held low (on) indefinitely, which I would like to address, but am not quite sure how. The input for AH is 5v btw.