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INA226读取电流值随负载电压变化

Other Parts Discussed in Thread: INA226

最近做了一块INA226的采样板,在使用它采样系统电流的时候,出现采样电流随系统电压变化的情况。例如系统电压为15V,恒流300mA 采样得到电流为210mA,系统电压为5V,依然恒流300mA,采样得到的电流为 265mA。测试发现电压越接近零采样越准确,不知道是什么原因?

原理图如下,采用10mR的四线检流电阻