| 摘要 |
PROBLEM TO BE SOLVED: To provide a switching power supply device which can suppress a variation of output power. SOLUTION: The switching power supply device comprises an induction element and a switching element connected to the induction element, feeds energy accumulated in the induction element to a load following a switching signal which turns on and off the switching element, and makes an induction element current flowing in the induction element reach zero once before the turn-on of the switching element due to the turn-off of the switching element. The switching power supply device is also characterized by comprising an on-time setting means which sets a target value of an on-time after the switching of a cycle of the switching signal to a time which is set by multiplying the on-time by√a before the switching of the cycle of the switching signal, in the case that the cycle of the switching signal is switched to a multiple of a (a is a positive number). COPYRIGHT: (C)2010,JPO&INPIT
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