| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that, since a conventional switching regulator must be equipped with a timer circuit, the increase in a circuit scale is inevitable, and troublesome adjustment of frequency is necessary. SOLUTION: This power supply includes a first transistor for generating output voltage from input voltage, an inductor and a capacitor for smoothing the output voltage, and a second transistor which has on-resistance larger than that of the first transistor, in which the capacitor is charged prior to the start of generation of the output voltage by the first transistor to allow the charged voltage of the capacitor to achieve the initial charging voltage less than the output voltage. The first transistor starts to generate the output voltage, when the charging voltage of the capacitor reaches the initial charging voltage. COPYRIGHT: (C)2006,JPO&NCIPI
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