画了一个PCB usb输入5v,测试out只有0.9v。什么原因呢?
并且测试ILIM,ISET和TS输出都是有方波信号输出。
TS接的是10k电阻到地,测试输出是750mv,但是上面有50hz的一个0-750mv,2ms的窄脉冲
现在把使能EN1,EN2接地,选用100ma usb 模式是可以有out4.4v输出的。
只要en2接高选用充电电流可调模式就不行
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