piclist 2003\02\12\164222a >
Thread: Negative voltage load disconnect.
www.piclist.com/techref/power.htm?key=voltage
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face BY : Ned Konz email (remove spam text)



On Wednesday 12 February 2003 11:48 am, you wrote:

> Question, anyone out there know how possibly to turn off the
> positive rail with an N-channel mosfet instead? This would be much
> better as typically N-channel have a much lower Ron.

Yes, but you'll need a gate supply that's above the positive rail.
There are "high side drivers" that have a boost supply to do this.
Unless the Rds is too high for you (and there's some very good PMOS
FETs out there now), I wouldn't bother with the hassle of adding one
of these.

--
Ned Konz
http://bike-nomad.com
GPG key ID: BEEA7EFE

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