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How this regulator works?

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Look at the this OLD ATX power supply.
Can somebody explain how the 3.3V regulatosr built around TL431 IC works. It looks like a
Shunt 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)



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