| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply device that quickly and accurately detects the turn-off of a secondary-side synchronous rectifier FET and more properly turns on a primary-side main switching element according to the detected turn-off of the secondary-side synchronous rectifier FET.SOLUTION: A power supply device, which is provided with a main switching element on a primary side of the transformer and a synchronous rectifier FET on a secondary side, includes: a voltage detection unit that detects a gate-source voltage of the synchronous rectifier FET on the secondary side; and a main switching element driving unit that drives the main switching element on the primary side according to the gate-source voltage of the synchronous rectifier FET on the secondary side which is detected by the voltage detection unit. |
