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LMR16030PDDAR电压不稳定的问题

Other Parts Discussed in Thread: LMR16030, AMC1301

请教一下

1. LMR16030PDDAR输出5V电压,上下波动有正负0.04V这样这样正常吗?

2.用此电压给电流传感器ACS758进行供电并采样。(电流传感器电流通过PWM进行控制。频率为10HZ,全开,与按占空百分比开时,采样电源波动比较大,如下图。

3.放大细节后如图

通道2是电源电压,通道1是电流传感器采样出来电压。波动比较大,没法采样准确,还请教这是什么问题。