the power-supply circuit-fixed of adjustable and DC part 14

Published:2011/5/29 20:14:00 Author:Ariel Wang | Keyword: adjustable, DC, circuit-fixed | From:SeekIC

The working principle of circuit This DC power-supply circuit-fixed is made up by the circuit of dropped-down and commutated voltage,steady output circuit and constant current output circuit.See chart 5-18 below. After the 220V AC voltage is dropped down through T，commutatedthrough VDl-VD4.It is connected to the third foot (the edge of input) of IC directly,as the input voltage of regulator.It is connected to VL through Rl.And then it light VL up. When the plug XPisnot plugged into the socket XS,the 15VAC voltage on the second winding of T is commutated through VDl-VD4，filtered through Cl and numberous regulation.Then it outputssteady DC voltage through the second foot of IC. You can adjust the resistence of RP,in order to make the output DC voltage contiously adjustable between 1.25-12V.



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