基于LM5117的开关电源设计

ABSTRACTWith the rapid development of electronic technology,electronicsystems,more and more extensive applications,the types of electronicequipment,more and more electronic equipment and people work and livecloser and closer.In recent years,with the power electronic devices(such as IGBT,MOSFET),PWM switching power supply technology anddevelopment of the theory,a new generation of power began to graduallyreplace the traditional power supply circuits.The circuit is small,flexible to control the output characteristics of a good,ripple,loadadjustment rate and so on.Switching power supply in the power adjustment control work in theoff state,with low power consumption,high efficiency,wide voltagerange,low temperature rise,and other outstanding advantages of smallsize,the communication equipment,CNC equipment,Instrumentation,video audio,home appliances so widely used in electronic circuits.High frequency converter switching power supply so many forms ofcommonly used with push-pull converter,full bridge,half bridge,single-ended forward and the form of single-ended flyback.In thisthesis,two-side driver IC -LM5117 PWM pulse output of the controllerdesign car audio power supply in use as a switch MOSFET,can improvethe efficiency of the power transformer,is conducive to impulse noisesuppression,but also can reduce the size of the power transformer.KEY WORDS:IGBT,MOSFET,Push-pull circuit,Half bridge circuit,Single-ended forward