| 摘要 |
A power supply unit includes a transformer converting an input voltage into a predetermined output voltage, a transistor controlling a current flowing through a primary winding of the transformer, an output voltage detecting circuit detecting an output voltage of the power supply unit and outputting a detection signal corresponding to-a level of the output voltage, a control circuit controlling the output voltage by switching on and off the transistor in accordance with the detection signal, and an operation control circuit controlling an operation of the control circuit in accordance with the output voltage
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