I have a problem I need to solve.
The input voltage is 18V to 32V and I need my circuit to be protected during overvoltage situations. I have TVS diodes to protect from transient surges, but I also need to protect my circuit from 5 minutes of 60VDC.
How can I accomplish this? The 60VDC blows away most, if not all, TVS diodes that are in the proper specification range.
I was thinking of using some sort of high side switch that shuts off if my voltage exceeds a certain level, but how would I approach that?
To make things worse, this circuit needs to work up to 125C.
Any insight or ideas would be greatly appreciated! Thank you.
edit: 200mA of current is the current draw of the circuit.