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zvs driver transistor

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LAN_403

alf

Fri Jul 08 2011, 12:05PM

Registered Member #3925 Joined: Fri Jun 03 2011, 10:50AM
Location:
Posts: 121

hey,

i figure that at the most, the mosfets in the zvs driver would only dissippate around 20watts each. -

power=I2R - 15x15x0.1 = 22.5 watts

and a mosfet such as the irf640n, has a power dissippation rating for over 100 watts.
the only problem with this critter is that the RDS(on) is a lil too high to be very efficient...

what mosfets do you think would be a good choice for the zvs driver?
ideally ones that are cheaper than the irfp series mosfets. and that work well etc...

thanks. Alf.

Dr. ISOTOP

Fri Jul 08 2011, 04:51PM

Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652

The dissipation rating is for the transistor clamped to a *very* good (e.g. water-cooled) heatsink so that the heatsink remains at 25C and the junction is at 150C.
IXYS makes FETs with super-low R_ds,on's.

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