I built an H-bridge using P-channel mosfets for the high-side switches. The mosfet's maximum gate-to-source voltage is +/-25vdc.... My design uses pull-up resistors to pull the gate voltage up to the source voltage to turn them off. This works fine at 12v and 18v.... But if I use a +24v power supply, this will create a gate-to-source voltage that is very close the max Vgs for the mosfet.
My question is how to limit the voltage difference between the gate and source to keep it well under 25v even though each gate is pulled up to source. Since the mosfet only needs 10v to turn on, will a 15v zener diode work between the gate and source to keep the Vgs within range? If so, how would I go about connecting it?
thanks,
jd
My question is how to limit the voltage difference between the gate and source to keep it well under 25v even though each gate is pulled up to source. Since the mosfet only needs 10v to turn on, will a 15v zener diode work between the gate and source to keep the Vgs within range? If so, how would I go about connecting it?
thanks,
jd