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DC-DC电源管理芯片vsense基准电压量出来不对



 

这是我的电路图,我的输入电压是12V,Vout=(R5+R8)*0.8V/R8 这款芯片的VSENSE基准电压量输出来不对,正常的事0.8V我的板子一块输出的是0.75V一块输出的是 0.65V,请问这是怎么回事啊?