Electronics > Projects, Designs, and Technical Stuff

Modern day 723 and 78xx for new design

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mariush:
No, most 317 regulators are advertised as 1.5A regulators and they have a "typical" current limit at around 2-2.2A ... maybe you can use an extra transistor to get 3A but just with the regulator alone, 3A ain't happening.

iMo:
The 317 recommended max Iout is 1.5A. For 3A you need an extra pass transistor over it (plus some basic overcurrent protection), or to run 2x317 in parallel (with some care}, or to use the LM338 (5A version).

David Hess:
Nothing has replaced the 723 and it is still in production.  The 317 is a general improved replacement for the 78xx series.  Improvements over the 317 and 78xx series include the LT1086 which is available in fixed and variable versions.

There have been other improved 78xx and 317 parts over the years but none caught on as much as the LT1086 and similar 3-pin parts.

Wolfgang:
People have tried to replace the 723 with better chips like the SG3532,  ...
they had thermal protection, lower voltage references, better current limiting, ...
but they could not match the 10c per chip, so nobody bought them and the vanished from the market.

battmyrne216:
nice example from an elenco power supply that used the 723. Edit: actually this schematic only uses the lm317. but the elenco I had happened to use the 723. Ive found its version schematic before but now im gonna have to find it.

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