| 摘要 |
PROBLEM TO BE SOLVED: To obtain the normal change rate of a second output in a light load state by a method, wherein a delay circuit which generates a delay signal is provided and an auxiliary switch which is built in a mutual adjustment output circuit, which is turned off by receiving the delay signal and which separates at least a part of a ringing inside the mutual adjustment output circuit, is provided. SOLUTION: A voltage change controller 225 is provided with a delay circuit 230, which is connected to a modulator (PWM) 220 and which generates a delay signal based on a main-switch control signal. In addition, it is provided with an auxiliary switch S2 which is built in a mutual adjustment output circuit 215, which is turned off by receiving the delay signal and which separates at least a part of a ringing inside the mutual adjustment output circuit 215. The delay circuit 230 contains a signal inverter, which generates a complementary signal with respect to the main-switch control signal. The auxiliary switch S2 can be formed of an n-channel field-effect transistor FET. In addition, the auxiliary switch S2 is connected between a diode D2 and a capacitor C2 in the mutual adjustment output circuit 215.
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