| 摘要 |
PROBLEM TO BE SOLVED: To enable the output of each regulator to raise in a prescribed order without having to increase the number of terminals in a multi-output power supply unit which uses a plurality of regulators to output a plurality of DC voltages. SOLUTION: A multi-output power supply unit comprises a plurality of regulators (regulator), and can output a plurality of output voltages based on an input voltage, each differing in voltage level. In the multi-output power supply unit, a plurality of voltage detection circuits (12A, 12B, and 12C) corresponding to a plurality of regulators (11A, 11B, and 11C) are provided. The plurality of voltage detection circuits are configured in such a way that the one corresponding to a regulator which is to be started first compares the voltage applied to the voltage input terminal with a prescribed reference voltage and, when the input voltage reaches a prescribed voltage, changes the output thereof, while the plurality of regulators are configured so as to start a conversion operation according to changes in the outputs of the respective voltage detection circuits corresponding thereto. COPYRIGHT: (C)2012,JPO&INPIT |
