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555 serial switch regulated power supply circuit

2015-02-05 03:35  
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555 serial switch regulated power supply circuit
Compared to the usual 555 pulse width modulator, this circuit connects resistance R3 between C1 and 2, 6 feet, it can decrease C1's voltage amplitude. The output voltage sample and amplification circuit are composed of VT2, R5, R6, R7, RP1, RP2, the feedback voltage can be changed by adjusting RP1 and RP2, then the duty ratio of switch square wave and output DC voltage also can be changed. VT1 adopts P groove VMOS tube MTM10P5, the rated current is about 10A. The energy storage induction is about 1mH. D is Fly-wheel diode.