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Old 25th Mar 2021, 5:25 pm   #4
ortek_service
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Join Date: May 2018
Location: Northampton, Northamptonshire, UK.
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Default Re: Weir HSS100/4 PSU blowup

5N06 etc. seems to me a very familiar style of voltage / current rating with some Power MOSFET makes. So MPT could just be a manufacturer prefix.

And searching on just that in mouser, find a lot:
https://www.mouser.co.uk/Semiconduct...d=5N06&FS=True

https://www.mouser.co.uk/Semiconduct...g?keyword=5N06

But not sure what package original ones is in - can't find much on that part in Google - to narrow down a bit.

I'm also wondering why there'd be a MOSFET in the chopper transistor's emitter circuit - normally that goes straight to the -V HT DC or sometimes via a current-sense resistor.
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