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TPS561201输出纹波问题

Other Parts Discussed in Thread: TPS561201, TPS561208

您好!

我按照规格书中推荐的原理图搭建电路后实际测试,发现纹波非常大。主要是由于芯片一直工作在“打嗝”模式,SW管脚间歇启动。想问一下,可能是哪里的问题?

输入12V;输出3.3V,30mA。

波形如下图:其中黄线为输出3.3V,绿线为SW管脚波形