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'723 Adjustable Voltage Regulator'
1996\09\16@154732 by Philip Lalone

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       Anybody have any experience with 723 adjustable voltage
regulators?  I just want to know the basics on how to get it working.

                                               Thanks,
                                               Philip Lalone
                                               Alpha-X Development

1996\09\16@163456 by Kalle Pihlajasaari

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Hi Philip,

>         Anybody have any experience with 723 adjustable voltage
> regulators?  I just want to know the basics on how to get it working.

A few bits of information.

Don't try to regulate an output below 3 V without an external
op-amp and transistor it won't work right.

I have used them as relay drivers with hysterisys (sp) working
in cutoff and saturation, a single chip battery charger for standby
batteries.  Have also used them to get 3 volt fixed from 12V car
but would never use one now unless I had to have the current
limitig feature.  A LM 317 is a 1.25 V regulator that you can float
the reference pin with a potential divider to give you a better
result than the 723 with hight current.

Also the 723 has some instability running into non-linear
loads like LEDs if they have a 'knee' that changes
the resistance significantly near the regulated voltage.
A simple LED and resistor caused the 3V regulator to go
spurrious and overheat with no other load attached, I have observed
a similar thing with 3 pin regulators as well if you forget the
caps on the input and output.

Cheers
--
Kalle Pihlajasaari     spam_OUTkalleTakeThisOuTspamdata.co.za
Interface Products     Box 15775, Doornfontein, 2028, South Africa
+27 (11) 402-7750      Fax: +27 (11) 402-7751

1996\09\16@173801 by Martin J. Maney

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On Mon, 16 Sep 1996, Philip Lalone wrote:

>         Anybody have any experience with 723 adjustable voltage
> regulators?  I just want to know the basics on how to get it working.

If all you need is a basic regulator, forget the 723 and use a modern
three-pin fixed or adjustable such as the 78xx or 317 family parts.  If
you really need to use the 723 - maybe you've inherited a boatload of
them? - you really want to get the datasheet, as these are old chips with
relatively messy requirements and limitations.

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