| 摘要 |
PROBLEM TO BE SOLVED: To enable suppressing variation in output voltage without causing scale-up or cost increase of a switching power supply unit. SOLUTION: The switching power supply unit is provided with an error amplifier 7 for amplifying an error between a DC output and a first reference voltage, and a carrier signal generator 8, wherein a comparator 9 turns on/off the switching elements 1, 2 on the basis of a result of comparison between the output of the error amplifier and the carrier signal to obtain a constant DC output. The switching power supply unit is provided with a comparator 15 and the switching elements are forcibly switched on at a timing at which the output of the error amplifier 7 exceeds a second reference voltage Vt so that a loss time in switching is eliminated and the variation in output voltage is suppressed. COPYRIGHT: (C)2009,JPO&INPIT
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