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DCDC电源,5v输入,3.3v输出6安培,,工作频率300k或600k,效率只有86.5%,为什么?

DCDC电源,5v输入,3.3v输出6安培,,工作频率300k或600k,效率只有86.5%,为什么?

是按照案例做的,mos已经选大了(3毫欧姆),同步整流,贴片电感选用dc电阻1.5毫欧姆,dc电流20A。

温度测试,电感温度升的最快(也最烫),接着是mos,然后是电容。