| 摘要 |
PROBLEM TO BE SOLVED: To provide a DC power unit having a standby mode and an active mode for preventing an output voltage from being temporarily lowered due to the influence of an internal capacitor for phase compensation when switching the standby mode to the active mode. SOLUTION: A power source (2a) for active mode to be controlled by an output transistor (Q1) in which the output of an error amplifier (OP1) having a capacitor (C1) for phase compensation whose one end is connected to the output terminal (12) is received through a first switch (SW1) by the control terminal (16) and a power source (3) for standby mode are switched, and power supply is executed. When the operation of the power source for active mode is stopped, the first switch is put in a non-conductive status, and the potential of the output terminal of the error amplifier is maintained as a value equal to the potential of the output terminal in the regular operation of the power source for active mode by an auxiliary constant voltage source (Eo). COPYRIGHT: (C)2006,JPO&NCIPI
|
