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TPS73633DBVR输出电压3.7V,纹波电压400mv 怎么解决呢?

用TI的 TPS73633B 时  输入5V纹波正常,但是输出电压到3.7V 并且纹波有400mv (示波器测量)怎么能降低这个纹波呢?