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Old 27th April 2008, 09:08 PM   #1
pftrvlr is offline pftrvlr  United States
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Default How this 317 PS works?

I am building a DAC kit, and this LM317 circuit is new to me. What are the pros? I guess it can provide more output current? But we are talking about low current DAC.

Also the open circuit output is 5.90v instead of 5.0v.
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Old 27th April 2008, 11:49 PM   #2
TheMG is offline TheMG  Canada
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Maybe this is designed for better ripple rejection and regulation.

This design only provides higher current if the regulator package or heat sinking is insufficient for a single regulator to dissipate the full voltage drop.
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Old 28th April 2008, 12:21 AM   #3
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The technique is called a tracking preregulator. It has nothing to do with extra current. Read about it in the datasheet:

http://cache.national.com/ds/LM/LM117.pdf
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