New recently A elective course design of university title: design A DC - DC switching power supply, demanded the lithium ion battery voltage of 3.7 V to + 5 V/1 A, 12 V/0.3 A output and efficiency of no less than 80% of the circuit, the power supply ripple is less than 100 mv, make electronic design A theme for the first time, hope to have the bosses to show A design idea

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