| 摘要 |
PROBLEM TO BE SOLVED: To provide a switching power supply device with higher efficiency, without increasing circuit scale.SOLUTION: A switching power supply device, for converting an input voltage to a predetermined output voltage, includes a first switching element, a first driver circuit for driving the first switching element, a first rectifier element, an intermediate node between the first switching element and the first rectifier element, a first inductor, and an auxiliary resonance circuit. The auxiliary resonance circuit includes a second switching element connected to the intermediate node, a second rectifier element, and a second inductor. The switching power supply device includes a second driver circuit for switching the second switching element, a control circuit for generating a control signal which turns on the first switching element and the second switching element for a predetermined on period, and outputting the signal, and a bootstrap circuit for supplying power to the first driver circuit and the second driver circuit.SELECTED DRAWING: Figure 1 |
