The op-amp μA741 switch power supply circuit

Published:2011/7/24 3:53:00 Author:Seven | Keyword: op-amp, switch power supply | From:SeekIC

The power supply adopts with the op-amp μA741 as the comparator control element, 2 triodes as the regulating elements, the circuit is working the the open state. When the output voltage is 2mV lower than the Vref, i.e the 2-pin is 2mV lower than 3-pin(as the sensibility ofμA741 is 2mV), 6-pin of μA741 is outputting a high LEV, VT1 and VT2 are conducting, large current load and relevant capacitors of C2 and C3 compensate the power, soon the output voltage rises to 12V, i.e 2-pin and 3-pin of μA741 have the same LEV.



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