Not like it hasn't been done before, but I decided it's about time I have some on hand.
'Dem printed boards sure look nice for a change.
Features:
- Unidirectional
- 8A current carrying capacity (on resistance < 70mohm)
- 40V open circuit capacity
- Fault current: opens in under 10us
- Moderate overload: opens up to 1ms+ later (adjustable)
- Current limit: adjustable
- Thermally protected (~100C at R4)
- Manual set/reset (pushbuttons)
- Battery operated (180uA current draw; was supposed to be under 50uA, I need to look into that -- but still, several months on a typical 9V battery)
With some mods, it could also be tweaked for continuous current limiting (thermally protected), foldback or otherwise; automatic retry (tick-tick-tick-tick...), and various interfaces (electronic set/reset, logic level indication, battery eliminator -- isolated supply), etc. And, needless to say, scalable to whatever voltage/current rating might be needed.
Tim