| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a power supply circuit device capable of suppressing power consumption of a resistor that measures the current value to a load. <P>SOLUTION: A resistor R2 is provided, parallel to a resistor R1 for generating a feedback signal that represents the output current value of a load 7. A voltage-selecting circuit 68 is provided in a control circuit device 6 for selecting the reference potential that is inputted in an inversion input terminal of an error amplifier 64. Thus, when the power of a DC power source 1 drops, the reference potential inputted in the error amplifier 64 and the resistance value of the resistor for detecting the output current value of the load 7 are changed to reduce power consumption, for holding long lifetime of the DC power source. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
