In the pass zen circuit a 10V or 20V zener diode (depending on what version) is shown across the gate terminal of the output fet. I beleive this is for over-voltage protection of the gate terminal. Why is it not necessary/desirable to have the same sought of protection on the CCS fet. I ask this question after I lost a CCS fet. I'm not sure what happened, maybe I wasn't careful enough with static precautions while I was modifying the circuit.
Also would it be advantageous to include a fuse in each positive supply rail before the CCS to give some form of short circuit protection? Would I size the fuse by tonging the supply rail under normal operating conditions? Any other comments/suggestions?
Cheers
Dan
Also would it be advantageous to include a fuse in each positive supply rail before the CCS to give some form of short circuit protection? Would I size the fuse by tonging the supply rail under normal operating conditions? Any other comments/suggestions?
Cheers
Dan