If you have a certain required rep rate for switching back and forth
for a class D "digital amp", like a PWM, and a known current to switch,
then you could get at a min size of FET, then since you need to drive it and
aren't familiar with chaining CMOS up and up in size from small with SPICE
simulations to get the sizing just right for speedy switching, I suggest
shopping for FET gate driver IC's. That could simplify your task down a lot,
for a price...and it would still be good to simulate the combination of the two.
John G
DJ Delorie wrote:
The thing to remember is that the gate on a mosfet (or any fet, I
suppose) is a CAPACITOR. You have to charge it to a sufficient
voltage to bias the mosfet; the charge time depends on the resistance
or current limits of the driving circuit. You also have to bleed off
the charge to shut it off again.
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