I'm trying to do something similar to this I think. Maybe you have some advice.

I'm running a DO-268 mosfet package and I want to let it run at whatever my linear signal tells it to, so long as it doesn't go above 4.75A. I've got a .100mohm 1% balance resistor (8mosfets in parallel) and I want to let the signal go up to, but not above the 4.75A and use that .100mohm resistors voltage be the indicator. I've got a diff amp that lets me know WHEN it has crossed, but I am stumped on how to make it back the drive off so it just holds the maximum 4.75A drive voltage.

You have any ideas? I'd like something pretty responsive, so I don't have errant over current driving popping mosfets or fuses.

Mod:created your own new thread.

Link to old thread.
https://forum.allaboutcircuits.com/...er-w-opamp-flip-flop-mosfet.30383/post-187994

 

Sorry. 0.1 ohm, not 0.100m ohm. And it's a TO-268. I misreferenced it because ita Dpak.

 

Using mosfets for a sense resistor is not going to be even close to stable, without a whole lot of complexity.
A suitable shunt resistor, 0.1000 ohms, 1%tolerance and 20 watts will be vastly more stable and take up much less space. AND it will last for at least 20 years.
For the regulated current mode, copy the design of a "fold-back current limit" power supply protection scheme. Your concept of that function is reasonable and has been achieved reliably many times. So there are a lot of implementations of that mode around.