200V N-channel FET 200V with nsec speed?

Hello Tom,

There is already some inductance ;-)

I did already suggest push-pull which would remedy a lot of problems. Hopefully the engineers there will warm up to that idea because it makes life easier.

Those are generally too low in breakdown voltage. The option is, of course, push-pull with a step-up transformer. For that scenario we'd already have the right FETs.

Hello Robert,

Or employ a fast clamp that charges up a capacitor, then use the cap as a "kicker".

Hello Henry, Hello Tom,

The 5v/nsec max dv/dt is a concern. Unfortunately they state dv/dt only for the two extremes. But it might be worth contacting them about more information here. I am afraid that transistors like the IXZ210N50L will blow the BOM budget though.

A large package would not be an obstacle here. A three-digit price tag might...

Reminds me of a ceramic cap that turned into bubbly green glass. The one next to it exploded and I could not find a speck of that one anymore. The supply current didn't even flinch during this episode and the amp kept on humming as if nothing had happened.

Hello Robert,

It has poor tdoff and tf (>>10nsec), plus we'd need to parallel about ten of them which drives the capacitances to uncomfortable levels. Infineon does have some newer nice devices but I am a bit hesitant with that manufacturer after they weren't able to get samples of their BSP297 to us. Despite the fact that I told them we'd pay whatever it takes to get them across the ocean and almost two hours on the phone :-(

"Joerg" schrieb im Newsbeitrag news:CwH6h.15655$ snipped-for-privacy@newssvr27.news.prodigy.net...

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I tested ceramic caps in this application but they were just to small in capacitance - ended up with 30s inparallel and the unavoidable pcb inductance problem. And to loud as a loudspeaker. Annoying clicks if the pump switched on (piezo-effect).

- Henry

Look at ST Micro STN1N20 or STQ1NC45R-AP.

Hello Robert,

Thanks. Whatever they mean with crossover time is a bit long but we'll order some.

This one is a bit slow but as Win hinted one has to take that data with a grain of salt. So, we'll order some of these as well.

I've been casting about for fast MOSFETs too (though I can live with

Steve

Hello Steve,

That's just the problem. They do not seem to understand how electronic parts are marketed. By now I believe it would take some high-level management changes over there to correct that problem. Then their sales will probably increase, big time. They need some execs who pound the pavement and regularly do spot-check visits on clients large and small. Just to feel the pulse. That's what we did in our med biz and the CEO expected it from us.