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LM2776输出错误,是0.18V

Other Parts Discussed in Thread: LM2776

刚开始使用时还好,输入是5V,输出是-4.86V,但使用一段时间后,就变成了0.18V,电路是按照datasheet上来的,负载只有一个放大器。请问是哪里不对?