Vce (sat) is 3.2 volts at 240 amps.
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9 years ago
Transistor substitution
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9 years ago
So what's that, about 750 watts of waste?
Jamie
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9 years ago
If you are switching 1700 volts at 240 amps, that's about 408000 watts. What percentage is 750 out of 408K?
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9 years ago
** With a Vce sat of 3.2V at 240amps, is way better than a high voltage mosfet.
Try to find a 1700V mosfet with an on resistance of 13 milliohms.
IGBTs have taken over in multi kW SMPS and motor drives because of this.
.... Phil
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9 years ago
what?
Do the math..
Jamie
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9 years ago
Grin, Most of the time if I use a transistor it's go an opamp wrapped around it. I've used the 3904/06 pairs too, but at one time I had issues with the 3904's doing some HF oscillation/ ringing.. I added Ferrite beads some more base R, waved a dead chicken over the circuit and it worked. I found the 2n4401 worked just as well, and didn't need the dead chicken. :^)
George H.