On Thu, 27 May 1999 00:26:34 GMT, you wrote:
>I looked into using MOSFETs once, the problem I had was how to control
>them in the analog mode. They really want to act like a switch. And
>the level at which they are in analog mode is very narrow and varies
>all over the place even between the same parts off the same batch.
They also seem to _really_ like to overheat and self-destruct when run
in the analog mode if you're trying to switch significant amounts of
current with them... (At least that's what we found out in the lab where I
work; we were trying to control a 40W (1A @ 40VDC) heater element with
one.)
>It makes you wonder if you could not use them in a PWM mode. That
>would be very efficient heat wise, but I'm sure the PWM frequency
>would have to be very high. But I know they've built audio amplifiers
>this way!
A deflection coil would be an inductive load, though... wouldn't
ringing be a problem?
----------------------------------------------------------------------
"An Academic speculated whether a bather is beautiful if there is none
in the forest to admire her. He hid in the bushes to find out, which
vitiated his premise but made him happy.
Moral: Empiricism is more fun than speculation." -- Sam Weber
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solarfox@DON'TMESSWITHtexas.net (Gary Akins jr.)
http://lonestar.texas.net/~solarfox
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Received on Wed May 26 20:25:31 1999
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