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。
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