What happens with a zener diode if it receives a transient? Is current at a voltage below the zener's rating that continues to flow, and then the zener conducts current to ground, to reduce the voltage, or will it be a loss of power situation whilst it's conducting?
When it's conducting, is it a 0-ohm short, or is there some resistance such that it will get warm, but recover after the transient is over?
I'm using an automotive application and so if I receive a transient greater then 16V, it'll fry some ICs.
I'm thinking i'll put a 15V zener on input power to ground, but just want to make sure what behaviour will occur during breif transients.
I imagine there wouldn't be total loss of power during the transient ?
I'm also not looking to have limited current available in the circuit as a side effect of adding the zener - what I think will happen: I can go along happily consuming current, and after the voltage exceeds 15V, the zener will take care of it.
What I don't want to happen: I draw 4A at 15V, and the zener limited by it's 5W rating breaks.