Constant current source using operational amplifier TAA861

Published:2011/12/5 0:54:00 Author:May | Keyword: Constant current source, operational amplifier | From:SeekIC

The output current of this circuit is determined by the following formula:IA=(Uref β)/R β+1 AIn the formula: Uref is reference voltage generated by voltage regulator tube, β is magnification coefficient of power tube. If β is big enough, IA≈Uref/R AThe technical data of this circuit:input voltage: UE=10~20Voutput current: IA=100mAlargest output current (R=805Ω): IAmax≈750mAcurrent adjustable rate (when △UE=1V, UE=15V, IA=100mA): F= △IA/IA=2×10-4load adjustable rate (when Ua=0~10V, UE=15V, IA=100mA): F=△IA/IA=1.6×10-3output current temperature factor: α<5×10-4V/K



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