R2 Co=(+RF=125-169y (2)输入电压取值范围 UImin =Lomax +Ulmin a 20V Omin+012max≈4125V(1 ) REF 1.25 16.9V 1 2 O  + U = ～ R R U （2）输入电压取值范围 41.25V 20V Imax Omin 1 2max Imin Omax 1 2min = +  = +  U U U U U U