Abstract
This paper introduced a single-terminaled flyback switching power supply with wide input voltage, low output voltage, large current and high efficiency, which is designed based on UC3843 that is a PWM chip. Adopts MOSFET synchronous rectification technology, and designs over-current and over-voltage protection circuit by photoisolator TLP521-1 and adjustable precision shunt regulator TL431. The experimental results show that the power supply has the advantages of good voltage-stabilization effect, simple structure, high regulation rate of load, and high efficiency, so it has perfect production application value.
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