Hi All,
Ok, I'm new here...
I need to sink about 800 joules of energy using a clamp/(maybe crowbar) overvoltage setup to protect FETS. The FETS are 30V(D-S) and I need to clamp anything above 27Volts. I've got my eye on a varistor from littelfuse, but I really think the best device to clamp the pulse (1 second pulse!) is a crowbar using a zener and voltage divider on n/p channel FET to ground..
The math indicates that I need to sink at least 200-300 amps for 1 second and I need to protect the FET from unknown ESD/TVS as well.
But I might go for a hybrid zener/tvs diode/varistor solution...
Anyone done this before?
Ok, I'm new here...
I need to sink about 800 joules of energy using a clamp/(maybe crowbar) overvoltage setup to protect FETS. The FETS are 30V(D-S) and I need to clamp anything above 27Volts. I've got my eye on a varistor from littelfuse, but I really think the best device to clamp the pulse (1 second pulse!) is a crowbar using a zener and voltage divider on n/p channel FET to ground..
The math indicates that I need to sink at least 200-300 amps for 1 second and I need to protect the FET from unknown ESD/TVS as well.
But I might go for a hybrid zener/tvs diode/varistor solution...
Anyone done this before?
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