Current sensor output modification. PIC or opamp or something else?

[pedja089]

You got most of circuit. I added one more buffer, so input to rest of circuit is low impedance. If you know your sensor output, you can omit first buffer.
Second OPAMP create comparator with hysteresis.
If input voltage excide trip point, output will be hi, so mosfet is turned on, and output voltage is reduced...