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TPS54201芯片使用时,电流实测与设计不符



PWM输入1.8v,设计350mA,根据公式选择限流电阻选择0.286欧,但是上负载实测340mA(万用表串联测试,电子负载测试显示都是这样),请问是什么原因?FB实测正常100MV,但是(LED-)112mv;按理说FB就是LED-,为何会有压差?