单端反激式开关电源-主电路设计

(PWM)ICMOSFETTOP244Y12V2.5A,TL431PC817TOP244Y,TOP244YABSTRACTSwitchingpowersupplyistheuseofmodernelectronictechnology,controlswitchingtransistorturn-onandturn-offtimeratiooftheoutputvoltagetomaintainastablepowersupply,switchingpowersupplygenerallybythepulsewidthmodulation(PWM)control,ICandMOSFETform.Thedesignofalargenumberofpredecessorsintheswitchingpowersupplydesignbasedontheflybackcircuittotheframework,usingTOP244Yconstitutea12V,2.5Aswitchingpowersupplymodule,throughtherectifierbridgeoutputtohigh-frequencytransformerprimaryside,thesecondarysidebythetimelevelrectifieroutput.TL431bysamplingtheoutputvoltageregulatorwithaninternalreferencevoltagecomparison,afteralinearopticalcouplerPC817changeTOP244Ydutycycle,sothecircuitcanbeDCregulatedoutput.KeywordSwitchingPowerSupplyPWMControlhighfrequencytransformerTOP244Y....................................................................................................................................31.PWM........................................................................4211PWM....................................................................................................51.1.1..............................................................................................5112PWM............................................................................612.....................................................................................................8121........................................................................8122........................................................................913.............................................................................................914...................................................................................102TOPSwitch-GX...................................................................................................1121TOPSwitch-GX......................................................................................1222TOPSwitch-GX..................................................................12221TOPSwitch-GX.................................................................12222TOPSwitch-GX.................................................................143..............................................................................1531...........................................................................16311..............................................................................16312..............................................................................17313..............................................................1932...............................................................................................203.3..........................................................................................224-.............................................................................2441...................................................................2542...............................................................265..........................................................................................................2751.......................................................................................2852...................................................................................................32....................................................................................................................................33....................................................................................................................................34............................................................................................................................34....................................................................................................................................353PWM4TOPSwitch-GXTOP244YTOPSwitch-GX75W290W132KHz132KHz30KHzPWMEE25100.38mm1.PWM511PWM1.1.1,,,,,,,,,,,,,,:1,,,,,IGBT,,,,IGBT,,,,,2DC/DC,DC/DC,DC/DC,MOSFET,DC/DC,STEP-DOWNBOOST,BUCK-BOOSTSEPIC,INVERTOR,STEP-DOWN,PWM,PFM,PC+12V+5V+3.3V-12V+5V,2.5V1.8V1.5V1VAC/DC,,DC/DC3,,,,,,PWMDSP;,,,,,,,,78,34,112PWM1-1,:,,,,PWM1-14:1:,2:3:;4:,PulseWidthModulation,PWMPulseFrequencyModulation,PFMPWMPFM,PulseWidthModulation,PWM,,,,;,,,PWM[1]1-2121211-31-3QPWMNpT1D1NsNsD1D1LoCo,CrRrDrRCD91-31223123EMI4131-4VT1VT42u2u2uVT2VT32u-2u2u101-4141-5du/dtdi/dtdu/dtdu/dtdi/dtdi/dt[6]111-5di/dtRCD2TOPSwitch-GX1221TOPSwitch-GXSwitchingModePowerSupply-SMPS,(PowerIntegrations-PI)90,PITOPSwitch-FXTOPSwitch-GX,250W,TOPSwitch-GX:TOP242PTOP244PTOP242GTOP244GTOP242YTOP250Y33,:(1)FX75W250W;(2)(L)(X),TOPSwitch-FXM,;3,,;4;5,;6,132kHz30kHz66kHz15kHz,,[8]22TOPSwitch-GX221TOPSwitch-GXTOPSwitch-GX2-1,1UCIC2TOPSwitchMOSFET34/5.7V,IfbRe5MOSFETReRC6MOSFET-700V7itUlim,MOSFET8135709/10SS1110ms1213141V1V[4]142-1TOPSwitch-GX222TOPSwitch-GXTOPSwitch-GX2-2CLXSFD4/(PWM)/2-2TOPSwitch-GXTOP-220-7CYTOPSwitch-GXD:MOSFETF:,S132kHz,C66kHz15S:MOSFETX:L:/C:TOPSwitch-GXTOP244Y2-3TOPSwitc