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RE: Power Supplies
- To: <ukha_d@xxxxxxx>
- Subject: RE: Power Supplies
- From: "Steve Morgan" <steve@xxxxxxx>
- Date: Tue, 8 Jul 2003 06:21:36 +0100
- Mailing-list: list ukha_d@xxxxxxx; contact
ukha_d-owner@xxxxxxx
- Reply-to: ukha_d@xxxxxxx
> -----Original Message-----
> From: Phil Harris [mailto:phil@xxxxxxx]
>
> > >... it is always OK to use a *REGULATED* PSU in place of an
> > >unregulated
> >
> > Is that strictly speaking true?
>
> Well given that a question has been asked and an answer
> requested then much as I feel it's pointless saying it but
> "Yes, it is true".
>
> Otherwise I wouldn't have bothered saying it.
It was my polite way of saying "Phil, you're talking shite".
Needless to
say, I shouldn't have bothered.
In order to minimise heat dissipation, you choose a supply voltage as
close to that required to provide the required output voltage, taking
into account the voltage drop of the regulator. A 12V unregulated PSU
can be used with a 12V linear regulator to provide a 12V regulated
supply. A 12V regulated PSU used with a 12V linear regulator will
provide an output of less that 12V because of the inherent voltage drop.
Regardless of how conservative you consider manufacturers 'should' be
with their designs, if they say an unregulated supply is required you
should not assume that you can blindy replace it with a regulated one.
Steve
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