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Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
EEYORE wrote ...
These look to be great for a drsstc. I may have a go at some... Matt
Remember, mosfets tend to be bad for drsstc's, do to the resistance. With those mosfets at room temp, you have about 120mohm on resistance. With a primary current of 400 amps, that would drop 48 volts across the mosfet. That adds up to 19kw of heat per pulse which is about 400 watts average dissipation, at 2% duty cycle. It does not sound right, but apparently it is. The mosfet itself cannot dissipate the heat that fast to the tab/heatsink, so it dies from overheating.
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
It is cheap and under the limit of paying import tax to Denmark, so I gave it a shot.
I am not at all impressed of 25 MOSFETs stuck together with electrical tape in a bubble envelope letter, there is no care for static protection from the seller.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Just be wary of cheap semiconductors nowadays on EBAY. Although IXYS usually doesn't fall under this case, many counterfeit semiconductors are hitting the market, especially those shipping over from China.
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IXFK 48N50Q Hoss mosfets on ebay
