Russell McMahon wrote:
>
> >This is a garden variety Rdson for good make MOSFETs (like, BUK... from
> >Philips). I have used one in a 100W SMPSU at 27A pk and it needed a very
> >small heatsink (under the circumstances). Check out some datsheets for
> >recent power MOSFETs... Sometimes I wonder seriously how these low Rdson's
> >are achieved. By using standard MOSFET calculations the required doping
> >densities appear to be obscenely large. Scary, in fact.
>
> Zillions of small MOSFETs in parallel.

Wow! That's even scarier! I'm yet to come across an
electronics repairer who has anything good to say
about MOSFETs. :o)
-Roman

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