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TL431C Application Circuits

2017-09-06 14:09  
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In this circuit, a TL431 shunt regulator is used to sense the output voltage. The TL431 drives the LED of a 4N28 optocoupler, which provides feedback to the MAX641 while maintaining isolation between the + 12-V input and the +15-V output (which is fully regulated with respect to both line and load changes).