I'm glad we got that cleared up. The concept is valid. The accuracy might have to be polished with a voltage reference to stabilize the current limit command.
So you could have built and tested the real circuit in less than an hour? You must be fast.I tried to run a simulation of a jfet amplifier stage with op-amp controlled DC feedback to compensate for the natural variance in jfet IDSS ranges. I had to build it one component at a time or the simulator couldn't figure it out. After more than an hour of adding one or 2 components at a time, it finally worked. I thought a simulator should work better than that.
I understand your position that you can simulate faster than I can build hardware. I can make a drawing in MSPaint faster than most people. However, I had already designed this circuit, tested it, built it, shipped it to the customer, and waited 10 years to see if it would fail. I was just checking to see if LTSpice could simulate a known good circuit instead of sitting there like a lump. Apparently LTSpice has difficulty with feedback loops, or beginners have difficulty with LTSpice, and that seems to be the problem this OP encountered.So you could have built and tested the real circuit in less than an hour? You must be fast.
I suppose I'm beating a dead horse here, but the idea of SPICE is to detect errors in the circuit before you build it, not afterwards....................................
Learning SPICE brings in a whole new set of opportunities to make a mistake.
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