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charge pump LM2662问题咨询

Other Parts Discussed in Thread: LM2662

我们用了TI的LM2662做+5V转-5V,电路图如下:

实测中发现LM2662的+5V输入被影响了,

下图为示波器交流档测的LM2662的输入

下图为示波器交流档测的LM2662的输出

请问是设计问题,还是LM2662实际使用就是这个效果?