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原理图，输入VIN=3.5V，输出本来是VDD=5V的，但是现在没有输出，而且芯片的第6引脚(VBAT)对地基本上是短路了，阻抗约10欧姆。所以怀疑是上电就直接烧芯片。固定的5V输出的，后来我们把反馈的R2和R3去掉后，还是出现同样的情况，烧芯片
