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电源芯片输出纹波不一样

Other Parts Discussed in Thread: TPS54331

我用TPS54331这款芯片做了一个+ - 8V的电源,但是在输出的时候正电压的纹波比较好。 但是负电压那边的电压纹波比正电压的大的多 这个是为什么呀?

这个是我负电压的原理图。

麻烦知道的工程师能给我说一下 谢谢了