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I have a 20 amp supply that I want to salvage . It blew up and two of the Mosfets really blew out
They are D209L 602F?T?C? The last letter is one of the three I think.
Its a fast switching transistor
Can I replace them with IRFB17N60 Mosfets
Probably not. MOSFETs have different drive characteristics to NPN transistors. The MOSFET will want ~10V gate voltage to be properly on, while the NPN will want ~1A base current (and only ~1V).
Assuming the drive voltage will actually go to 10V (with the NPN removed), you'll probably need a strong pull-down resistor to turn the MOSFET off when the output is no longer being driven. If the drive voltage can exceed 30V, then you'll want some protection in the form of e.g. a 24V zener.
If you can provide a schematic then you can get a more definitive answer.
Basically the input rectifier, capacitors, switching transistors, output diodes and output capacitors may be faulty as well; so you can either test them all [preferably out of circuit] (capacitors: ESR, value, leakage resistance; diodes: forward and reverse voltage drop), or pray that it's just the transistors that are bung. Praying is not guaranteed to work unfortunately.
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