Richtek Technology Corporation

Shin-Li Lin

Ta-Yung Yang

Shih-Jen Yang

Chao-Chi Chen

Yi-Min Shiu

He-Yi Shu

Yu-Chieh Hsieh

Chih-Ching Lee

A flyback power converter includes a power transformer, a first lossless voltage conversion circuit, a first low-dropout linear regulator and a secondary side power supply circuit. The first low-dropout linear regulator (LDO) generates a first operation voltage as power supply for being supplied to a sub-operation circuit. The secondary side power supply circuit includes a second lossless voltage conversion circuit and a second LDO. The second LDO generates a second operation voltage. The first operation voltage and the second operation voltage are shunted to a common node. When a first lossless conversion voltage is greater than a first threshold voltage, the second LDO is enabled to generate the second operation voltage to replace the first operation voltage as power supply supplied to the sub-operation circuit; wherein the second lossless conversion voltage is lower than the first lossless switching voltage.

Flyback power converter and secondary side power supply circuit and control method thereof

Growing community of inventors

Hsinchu, Taiwan

Shin-Li Lin