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TPS5450: 技术问题

Part Number: TPS5450


用TPS5450设计了一个电源,输入24V,输出电位器可调节,有如下问题

1,发现空载条件下,波纹有点大,如图,输出8.8V,示波器500mv/div,10us。

2,发现PH脚的波形不是方波,如图,这是啥波形有什么影响?