I need to drive a mosfet in current-sink mode. It's similar to this circuit
but V- will be ground and I'll run the opamp off +8 or +10 or something, whatever drive the fet needs to sink 150 amps.
I'd prefer to not have a negative power supply. At zero requested current, I want the current to be really zero, namely the fet gate at ground. I can futz in a little DC offset to guarantee that the opamp rails low.
Opamps are often not spec'd for what happens when they rail, namely how slow and how ugly they come out of saturation. An internal compensation node can wind up. I'd like to get back in business in ballpark 1 us.
Does anybody have favorite R-R opamps that come out of saturation fast and clean?
I recall one Intersil chopamp that took several seconds to recover.