Switching mode power supply and driving method thereof

摘要: The present invention relates to a switch mode power supply and driving method for reducing switching loss audible noise in the burst mode. includes main switch, supply, an output unit, controller. transformer having primary coil connected supplies secondary of according operation switch. unit is outputs supplied transformer. controller receives feedback signal corresponding voltage sense current flowing sync difference at controls on/off determines whether start by using signal, maintains forcibly off period so that reference frequency may be less than predetermined value.