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关于DCDC芯片lmz12001输入,输入电压有下冲?

Other Parts Discussed in Thread: LMZ12001, LMZ12003

 

 

 

 

 

说明:输入约为15V,电路输出为5V 负载400MA,调试时增大了芯片输入电容,但下冲没有改善 。直流上加载了交流数字信号传数据,但信号周期性被下拉400mv左右,影响了后面解析数据信号。请帮忙分析下原因,谢谢!: