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'[OT]How to make high side switch'
1999\11\12@040900 by Jinx

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There are any number of ways to control 12V by 5V.

For example use the PIC to drive an npn TR to ground the base of a
pnp power TR whose base is normally held high by a  resistor (the
pnp's emitter is also connected directly to 12V), the 12V coming out
of the pnp collector into the reg.

Or an optocoupler, driving the LED side with the PIC, the TR side
driving either a power TR, FET or reg directly

Or a 5V-12V level shifter, eg ICL7667 to drive a power FET

Or even an RS232-type or bus level shifter (you may have one lying
around)

etc etc etc

A lot depends on what current you'll be expecting to put through the reg

Jinx

1999\11\12@045127 by McMeikan, Andrew

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Don't forget you can get 5 volt regs with logic shutdown control such as
LM2925

       cya,    Andrew...

> {Original Message removed}

1999\11\12@181543 by Russell McMahon

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>Don't forget you can get 5 volt regs with logic shutdown control such as
>LM2925


These are useful BUT note that they draw current in shutdown which may be
significant in battery powered applications (10's of uA AFAIR).

Also note the MINIMUM 10 microFarad output capacitor spec (see recent thread
on regulator output caps).

RM

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