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Keywords: flyback switching power supply; LM5021; current-limiting circuit; transformer Abstract. The paper introduces the process of designing an efficient flyback switching power supply on basis of LM5021 chip. It describes the process as the following 3 steps:1) designing a current-limiting circuit; 2) calculating the parameters of the transformer for the switching power supply and designing a feedback circuit as well as putting forward a new idea in accordance with the efficient self-driving circuit; 3) conducting prototyping test to prove the validity and realizability of the design.

Design of Efficient Flyback Switching Power Supply Based on LM5021