| 摘要 |
<P>PROBLEM TO BE SOLVED: To control power consumption by performing an intermittent operation during a light load, to control to the minimum a fluctuation of an output voltage in the case that a load current increases rapidly from a light load state, and to reduce rigging. Ž<P>SOLUTION: Comparators 105 and 104 to compare a feedback signal Vfb insulating an output brought from an error amplifier 123 by a photocoupler 108 with first and second set voltages V1 and V2 are provided, a relation between the first set voltage and the second set voltage is settled as V1>V2, an output of a driving pulse brought from a driving circuit 101 is stopped when the Vfb falls below the V1, and an output of an operation voltage brought from a first power supply circuit 103 is stopped when the Vfb falls below the V2. The power consumption during the light load is controlled and the rigging of the output voltage is reduced thereby. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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