Shahriar Posted October 13, 2006 Report Share Posted October 13, 2006 HiLook at the this OLD ATX power supply.Can somebody explain how the 3.3V regulatosr built around TL431 IC works. It looks like aShunt regulator but very strange. I know How TL431 works but can't understand this circuit. i.e. if Q13 Current changes, how does this affect 3.3V rail. (look at R71)http://www.4shared.com/file/4564161/afd71557/atxps.htmlThanXShahriar Quote Link to comment Share on other sites More sharing options...
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