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LM3414输出电流精度

按规格书的原理图设计的电路,RIADJ为3.3KΩ,精度为1%,DIM设置的频率为72KHz,设置最大占空比为80%,开关频率为1M,但做出来的板子,输出电流差异很大,最大能达到40mA,这是什么问题造成的呢?