Re: hexfet mosfet get hot too fast

Hello Terry,


this ones not great, 71% efficiency. it switches at 250kHz....

IIRC the OP wanted to run at 20kHz. I think the 494 can do up to 300kHz but up there the losses due to slow transitions would be really bad.

YDRC, and yes its lossy at 250kHz; the level-shifted gatedrive doesnt help, either. But the loss is in the FET, which has a nice heatsink, and I need the losses anyway.


Hmm, no idea what the acronym YDRC could mean. Sometimes these are like the custom license plates in the US where you can pick your letter/number combo (for a fee, of course...) and then the other drivers have to guess what it means.

Need losses anyway? Are you guys already preparing for winter? ;-)


BTW thanks for the WDF references.


Most welcome.

Regards, Joerg

http://www.analogconsultants.com
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