More precise constant voltage and constant current circuit composed of output voltage sag compensation function

Published:2011/7/20 0:41:00 Author:Fiona | Keyword: sag compensation function, constant voltage, constant current | From:SeekIC

The current mode working state:constant current control mode compares with the voltage drop of current sampling resistor R7 through setting the optocoupler LED's voltage drop.When the output current is not up to the constant current set point,the voltage drop of R7 reduces and it can be ignored;when the output current reaches the constant current point, C3 voltage drop of R7 increases,this increasing voltage converts the voltage into current and adds to the optocoupler's LED through the resistor R6 to make the current flowing through the LED increase, through the circuit's feedback GND control function,the output current is constant.



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