| 摘要 |
PROBLEM TO BE SOLVED: To prevent deterioration of efficiency from a small load region to a large load region to thereby prevent the effect of ripples. SOLUTION: In a DC/DC converter 100, a plurality of inductors 103 and 103-1 to 103-n are arranged in parallel. An SW control circuit 106 on/off-controls SWs 107-1 to 107-n and adjusts an inductance based on a difference between an input current and an output current of a resistor 104. A PWM control circuit 101 adjusts an oscillation frequency based on the difference between the input current and output current of the resistor 104. COPYRIGHT: (C)2010,JPO&INPIT
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