| 摘要 |
PROBLEM TO BE SOLVED: To provide a constant current/constant voltage circuit which has a structure simpler and less expensive compared with conventional ones and can perform constant current/constant voltage control for power supply output, and to provide a charger using it. SOLUTION: The constant current/constant voltage circuit 12, without directly inputting a detected voltage IRs of a sense resistance Rs to an operational amplifier OP1, inputs a partial voltage Ve of a standard voltage Va, which changes corresponding to an output current I, to the operational amplifier OP1. In addition, without directly providing the output of the operational amplifier OP1 to an output transistor 124, the constant current/constant voltage circuit 12 changes a partial voltage Vc of the standard voltage Va, which is to be inputted to an error detection circuit 123 corresponding to the output of the operational amplifier OP1. COPYRIGHT: (C)2003,JPO
|
