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XTR111: 输出线性度不够

Part Number: XTR111

我设计的XTR111电路,在低输入时线性度很差,VIN为0-10v输入,Rset为5K,对应输出0-20ma,但结果是输入在0-2v时线性度极差。例如输入1.25v信号时,输出只有不到1ma,此时测量Is电压为22v左右,EF输出高电平,Vset也约为1.25V.