Need help in analysing this LM317 ckt

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cameo_2007

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There is something wrong with your attachment, when I click them I get "Invalid Attachment specified. If you followed a valid link, please notify the administrator"

Alex
 

Any clue on what is that helping for, as the chip also has a 1.25V reference.
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The circuit possibly intends a better load regulation than achievable with a single LM317. It's however not obvious, that the feedback loop is stable at all.
 

generally an extra feed back by using a configurable reference like TL431 is added to achieve a lower output voltage by introducing a different feedback than generally done by feeding the output directly through a voltage divider(or to cheat the eror amplifier of the LDO:wink......here the purpose should be a better load regulation.....
 

cameo : i found onw with a similiar configuration.....refer page number 8 with a different linear regulator.....they have explained the function but maynot be relevent for this application but as a reference....
**broken link removed**
 

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