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TL431 + BJT to regulate SMPS with Vout = 36V?

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Hi. If voltage supply goes high enough, current from various sources will be higher than current that flows through R2, and in that case, the regulator might get more then 36V between kathode and anode. So it's not protected from overvoltage - if the voltage goes high enough.

Also remember that current cannot go in negative direction into a transistors emitter (hence the arrow). So one can easilly be fooled of this and think its proof enough. But it isn't.
 
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