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'[PICLIST] [OT][BUY]power supply design'
2001\01\16@224854 by Jane Ifurung

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We are doing a project where we are using single 12V
power supply. We wanted to run +/-5V, +/-12V, and +3V
on our single board to be derived from the single +12V
power supply. Is there a single voltage regulator that
can do this? Can you please give me some sites where I
can get valuable information on designing power
supplies and the EMI or EMC consideration?

Thanks and more power to you all.

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2001\01\16@230332 by David VanHorn

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At 07:43 PM 1/16/01 -0800, Jane Ifurung wrote:
>We are doing a project where we are using single 12V
>power supply. We wanted to run +/-5V, +/-12V, and +3V
>on our single board to be derived from the single +12V
>power supply. Is there a single voltage regulator that
>can do this? Can you please give me some sites where I
>can get valuable information on designing power
>supplies and the EMI or EMC consideration?

A flyback switcher can do this for you.
You only get one regulated output, without external post-regulation.
EMI/EMC isn't a problem if designed/built right.

How much power do you need on each output?

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2001\01\17@004543 by Dan Michaels

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Jane Ifurung wrote:
>We are doing a project where we are using single 12V
>power supply. We wanted to run +/-5V, +/-12V, and +3V
>on our single board to be derived from the single +12V
>power supply. Is there a single voltage regulator that
>can do this?


If you check their site, TI may have a chip that provides
several of these voltages - look especially for parts intended
for portable devices, like cell phones.

I have a project where I did this the "hard" way -[ie, maximum
linear approach preferred by me], but certainly other piclisters
have been more clever:

12vdc@500mA -+--> 7805 [5v@300mA]
wallwart     +--> 78L12 -+--> 78L06 [+6v@20mA]
                        +--> 7662 [-12v@40mA] --> 79L06 [-6v@20mA]

The 78L06 and 79L06 provide power for opamps and sine generators.
All the values were chosen to provide just enough overhead to keep
all the regulators doing their jobs. With bipolar opamps, +/-6v
power allows the upper rail to just make +5v to feed into the
A/D of a PIC.

hope this helps,
- Dan Michaels
Oricom Technologies
http://www.oricomtech.com
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2001\01\17@011853 by McMeikan, Andrew

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If your after a high power design, look over mine at http://opendesign.cx
easy to do and about 80% efficient, have not got a 3v rail, but you can add
that in pretty easily the way I have done it.

       cya,    Andrew...

> {Original Message removed}

2001\01\17@094110 by M. Adam Davis

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Check out linear tech's site (http://www.linear-tech.com/ ), and look for
laptop power supplies.  They have several designs built around switching
power supply chips which output those voltages.  Usually they require a
custom, or special transformer though...  although I suspect it might be
common enough that coilcraft and others might have stock parts which
fit...

-Adam

Jane Ifurung wrote:
{Quote hidden}

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