Steady voltage circuit with adjustable output voltage

Published:2011/4/26 20:35:00 Author:Nicole | Keyword: steady voltage, adjustable output voltage | From:SeekIC

In this circuit, the current I is decided by R2+RP+R1 branch resisitance, the current should be higher than the input currrent of operational amplifier, that is I=1mA. It also depends on the mimimum output voltage UAmin. When the voltage is adjusted to the maximum value, the current I becomes higher too. The resistance R1 should ensure the voltage on R1 higher than 0.5V, to stabilize the work range of operational amplifier. The lowest output voltage is determined by UR1+UR, UR is the integrated regulator constant voltage. The highest output voltage is decided by UE*(-US+UR2). If US=1.5V, UR2=1V, then Umax≈UE=-2.5V.



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