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Old 25th Mar 2021, 5:43 pm   #5
TonyDuell
Dekatron
 
Join Date: Jun 2015
Location: Biggin Hill, London, UK.
Posts: 5,188
Default Re: Weir HSS100/4 PSU blowup

It's a normal TO220 package. Metal tab, it's clipped to a heatsink with the appropriate insulator.

It's mt in front of me at the moment, but I think it's a Motorola part.

It appears to be part of the regulation circuitry. The chopper may well be self-oscillating, the mosfet enables/disables it.
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