输入引脚接5V电压没有问题，但是得不到想要的3V电压，输入端使用的是2.2uf电容，输出用的是1uf电容，syn引脚上拉和悬空都试过，结果一样，都是空载时输出5.5，接负载（单片机最小系统）时4.3V，离需要的3.3还差好多
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