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Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
I've been playing with some of these lately. They are really powerful, and they don't even need a heatsink at a continuous 50 amp 24V DC load. They don't like the inductive kickback of a flyback very well though... Anyway, you can get them here in packs of 12.
Apparently fairchild has a whole line of "ultrafets".
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I used the Ultrafets years ago to build an inverter, for converting 24V DC to 240V AC. They worked great, but they're an almost 10 year old design, and MOSFET technology has probably improved quite a bit since. But who cares if they're cheap on Ebay
As was mentioned, not the best choice for driving a flyback. The flyback has to be allowed to make that inductive kick on the primary: it's necessary to generate the high voltage on the secondary. If you use a 100V MOSFET then all the energy that should have gone into your arcs will just be dissipated in the MOSFET and burn it out.
Another way to drive a flyback is using a bridge-type driver and getting the high voltage by resonance. That would work better with these MOSFETs.
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Pretty powerful mosfets
