Gene Heskett wrote: > > Humm, is there an IC that will function as the switch driver, and whose > output could be controlled with a PWM mode? Something that would start at > 15% duty and taper to 100% when the applied voltage had dropped to say 20 > volts. Then the Q is how fast can these be switched, I get the impression > I'm still looking at hexfets I can steal out of dead computer PSU's. These > things speed (lack thereof) will cause their own SOA self destruction I > expect. > > I use the IR2113 and similar chips to drive FETs. You'd need some op amps and/or comparators to generate the PWM. Lack of speed? The IRFB31N20D was so fast it caused problems with the dV/dT (and dI/dT) affecting the rest of the circuitry. Easily 100 ns turn-on/turn-off times, even with resistors in the gate circuit.
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