Switch Power Supply Circuit of Operational Amplifier A741

Published:2011/6/15 10:40:00 Author:Michel | Keyword: Operational Amplifier, Switch Power Supply, Circuit | From:SeekIC

The picture shows a novel design of switch power.The power adopts operational amplifier A741 as comparing control elements, two transistor as adjustable components and the circuit work in switch state.When the output voltage is 2mV lower than benchmark low voltage,in other words,μA741 ② feet is 2mV lower than ③ feet(Because μA741 response sensitivity is 2mV),μAT41 ⑥ feet outputs high PWL,control VT1 and VT2 conduct and load with large current and relevant filter capacitors,C2 and C3 supply power which makes output voltage increases to 12V,that's to say,both μA741 ② and ③ feets' potential are equal.The⑥ feet outputs low voltage (2 V), VT1, VT2 close and it suspends supply electric power.As the time goes by, the output voltage drops grdually and repeats the aboved process,the power keeps in swtich state and the output voltage is 12V all the time.



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