output mosfet fails if + and - supply shorts

nonprof

Member
2011-06-08 1:33 am
Hello!

I have a question, why the output mosfet IRF640N fails and amp goes to protect, if accidentally shorts the +- of the amp? The second time I short the +/- supply the output mosfets fails again, do it at 3rd time and another mosfet fails.

These are newly installed fets, Did I used a counterfeit mosfet? or the low voltage protection is not functional?

This is amp is china made amp, 850rms mono. It uses 2 NOR Gates.

regards,
Armand
 
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