1、XLSEMIDatasheetRev2.4 #Rev2.4 XL25963A150KHz40VBuckDCtoDCConverterXLSEMIDatasheetRev2.4 #Rev2.4 #XLSEMIDatasheetRev2.4 #Rev2.4 #FeaturesnWide4.5Vto40VInputVoltageRangen3.3V,5V,12V,andadjustableversionsnOutputAdjustablefrom1.23Vto37VnMaximumDutyCycle100%nMinimumDropOut1.5VnFixed150KHzSwitchingFrequen

2、cyn3AConstantOutputCurrentCapabilitynInternalOptimizePowerTransistornHighefficiencynExcellentlineandloadregulationnTTLshutdowncapabilitynON/OFFpinwithhysteresisfunctionnBuiltinthermalshutdownfunctionnBuiltincurrentlimitfunctionnBuiltinsecondcurrentlimitfunctionnAvailableinTO-220,TO-263packagesApplic

3、ationsnLCDMonitorandLCDTVnDigitalPhotoFramenSet-upBoxnADSLModemnTelecom/NetworkingEquipmentGeneralDescriptionTheXL2596isa150KHzfixedfrequencyPWMbuck(step-down)DC/DCconverter,capableofdrivinga3Aloadwithhighefficiency,lowrippleandexcellentlineandloadregulation.Requiringaminimumnumberofexternalcomponen

4、ts,theregulatorissimpletouseandincludeinternalfrequencycompensationandafixed-frequencyoscillator.ThePWMcontrolcircuitisabletoadjustthedutyratiolinearlyfrom0to100%.Anenablefunction,anovercurrentprotectionfunctionisbuiltinside.Whensecondcurrentlimitfunctionhappens,theoperationfrequencywillbereducedfro

5、m150KHzto50KHz.Aninternalcompensationblockisbuiltintominimizeexternalcomponentcount.XLSEMIDatasheetRev2.4 #Rev2.4 #XLSEMIDatasheetRev2.4 #Rev2.4 #Figure1.PackageTypeofXL2596XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596Rev2.4 Rev2.4 #PinConfigu

6、rationsXLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596Rev2.4 #Rev2.4 #XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596Rev2.4 #Rev2.4 #ON.OFrFEEDBACK3NDOUTPUTFigure2.PinConfigurationofXL2596(T

7、opView)CM-OFFFEEDBACKOUTPUTXLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596Rev2.4 #Rev2.4 #XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596Rev2.4 #Rev2.4 #Table1PinDescriptionXLSEMIDatasheet3A

8、150KHz40VBuckDCtoDCConverterXL2596XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596Rev2.4 #Rev2.4 #XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596Rev2.4 #Rev2.4 PinNumber12345PinNameVINOUTPUTGNDFEEDBACKON/OFFDescriptionSupplyVoltageInputPin.XL

9、2596operatesfroma4.5Vto40VDCvoltage.BypassVintoGNDwithasuitablylargecapacitortoeliminatenoiseontheinput.PowerSwitchOutputPin(SW).Outputistheswitchnodethatsuppliespowertotheoutput.GroundPin.Caremustbetakeninlayout.ThispinshouldbeplacedoutsideoftheSchottkyDiodetooutputcapacitorgroundpathtopreventswitc

10、hingcurrentspikesfrominducingvoltagenoiseintoXL2596.FeedbackPin(FB).Throughanexternalresistordividernetwork,Feedbacksensestheoutputvoltageandregulatesit.Thefeedbackthresholdvoltageis1.23V.EnablePin.DriveON/OFFpinlowtoturnonthedevice,driveithightoturnitoff.Floatingisdefaultlow.XLSEMIDatasheet3A150KHz

11、40VBuckDCtoDCConverterXL2596XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596Rev2.4 Rev2.4 #FunctionBlockXLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596Rev2.4 #Rev2.4 #XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596XLSEMIDatasheet3A150KHz4

12、0VBuckDCtoDCConverterXL2596Rev2.4 #Rev2.4 #3.3VReguljtur1,23VReferenceLisGillatorISOKHzFigure3.FunctionBlockDiagramofXL2596COMPIXLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596Rev2.4 #Rev2.4 #XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596XLS

13、EMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596Rev2.4 #Rev2.4 #TypicalApplicationCircuitXLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596Rev2.4 #Rev2.4 #XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596XLSEMIDatasheet3A150KHz40VBuckDCtoDCConver

14、terXL2596Rev2.4 #Rev2.4 Figure4.XL2596TypicalApplicationCircuit12V-5V/3AXLSEMIDatasheetXLSEMIDatasheetRev2.4 Rev2.4 XL25963A150KHz40VBuckDCtoDCConverterOrderingInformationXL2596匚|匚IElEl:LeadFreeCircuitTypeADJ:Adjust3.3:3.3V5.0:5V12:12VVersionPackage一S:TO263-5LT:TO220-5LPackageTemperatureMarkingIDPac

15、kingTypeSuppliedAsRangeLeadFreeXL2596T-ADJE1TubeTO220-5L-40oC85oCXL2596T-3.3E1TubeXL2596T-5.0E1TubeXL2596T-12E1TubeXL2596S-ADJE1800UnitsonTape&ReelTO263-5L-40oC85oCXL2596S-3.3E1800UnitsonTape&ReelXL2596S-5.0E1800UnitsonTape&ReelXL2596S-12E1800UnitsonTape&ReelXLSEMIPb-freeproducts,asdesignatedwith“El

16、”suffixintheparnumber,areRoHScompliant.3A150KHz40VBuckDCtoDCConverterXL2596AbsoluteMaximumRatings(Notel)ParameterSymbolValueUnitInputVoltageVin-0.3to45VFeedbackPinVoltageVFB-0.3toVinVON/OFFPinVoltageVON/OFF-0.3toVinVOutputSwitchPinVoltageVOutput-0.3toVinVPowerDissipationPDInternallylimitedmWThermalR

17、esistance(TO22O&TO263)(JunctiontoAmbient,NoHeatsink,FreeAir)Rja30c/wOperatingJunctionTemperatureTJ-40to125cStorageTemperatureTstg-65to150cLeadTemperature(Soldering,10sec)Tlead260cESD(HBM)2000VNotel:StressesgreaterthanthoselistedunderMaximumRatingsmaycausepermanentdamagetothedevice.Thisisastressratin

18、gonlyandfunctionaloperationofthedeviceattheseoranyotherconditionsabovethoseindicatedintheoperationisnotimplied.Exposuretoabsolutemaximumratingconditionsforextendedperiodsmayaffectreliability.3A150KHz40VBuckDCtoDCConverterXL2596i_XL2596-3.3ElectricalCharacteristicsT=25C;unlessotherwisespecified.aSymb

19、olParameterTestConditionMin.Typ.Max.UnitXLSEMIDatasheetXLSEMIDatasheetRev2.4 #Rev2.4 #XLSEMIDatasheetXLSEMIDatasheetRev2.4 #Rev2.4 #Systemparameterstestcircuitfigure6VOUTOutputVoltageEfficiencyVin=4.75Vto40VIload=0.2Ato3AVin=12V,Vout=3.3VIout=3A3.1683.33.43273-%XL2596-5.0ElectricalCharacteristicsT=2

20、5C;unlessotherwisespecified.aSymbolParameterTestConditionMin.Typ.Max.UnitSystemparameterstestcircuitfigure7Vin=7Vto40VIload=0.2Ato3AVin=12V,Vout=5VIout=3AVOUTOutputVoltageEfficiency4.855.2V80%XL2596-12ElectricalCharacteristicsT=25C;unlessotherwisespecified.aSymbolParameterTestConditionMin.Typ.Max.Un

21、itSystemparameterstestcircuitfigure8Vin=15Vto40VIload=0.2Ato3AVin=25V,Vout=12VIout=3AVOUTOutputVoltage11.521212.48VEfficiency90-%XL2596-ADJElectricalCharacteristicsT=25C;unlessotherwisespecified.aSymbolParameterTestConditionMin.Typ.Max.UnitSystemparameterstestcircuitfigure9VOUTEfficiencyOutputVoltag

22、eVin=4.5Vto40VIload=0.2Ato3AVin=12V,Vout=3VIout=3A1.1931.231.26773-%XLSEMIDatasheetXLSEMIDatasheetRev2.4 #Rev2.4 3A150KHz40VBuckDCtoDCConverterXL2596ElectricalCharacteristics(DCParameters)Vin=12Vforthe3.3V,5V,andAdjustableversionsandVin=24Vforthe12Vversion,GND=0V,Vin&GNDparallelconnecta220uf/50Vcapa

23、citor;Iout=500mA,T=25C;theothersfloatingaunlessotherwisespecified.ParametersSymbolTestConditionMin.Typ.Max.UnitInputoperationvoltageVin4.540VShutdownSupplyCurrentISTBYVON/OFF=5V80200uAQuiescentSupplyCurrentIqVON/OFF=0V,VFB=Vin210mAOscillatorFrequencyFosc127150173KhzSwitchCurrentLimitILVFB=03.64.86.9

24、AON/OFFPinThresholdVHigh(RegulatorOFF)1.4VON/OFFLow(RegulatorON)0.8ON/OFFPinInputIHVON/OFF=2.5V(OFF)515uALeakageCurrentILVON/OFF=0.5V(ON)0.25uAOutputSaturationVoltageVCEVFB=0VI=3Aout1.31.5VMax.DutyCycleDMAXVFB=0V100%XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596XLSEMIDatasheet3A150KHz40VBuckDCt

25、oDCConverterXL2596Rev2.4 Rev2.4 #TestCircuitandLayoutguidelinesOCATETHEPROGRAMMINGR“KEEPFEEDBACKWIRDVW7?_TLXLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596Rev2.4 #Rev2.4 #XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596XLSEMIDatasheet3A150KHz4

26、0VBuckDCtoDCConverterXL2596Rev2.4 #Rev2.4 #Figure5.StandardTestCircuitsandLayoutGuidesSelectR1tobeapproximatelyIK,usea1%resistorforbeststability.ClandCFFareoptional;inordertoincreasestabilityandreducetheinputpowerlinenoise,CINandC1mustbeplacedneartoPIN1andPIN3;Foroutputvoltagesgreaterthanapproximate

27、ly10V,anadditionalcapacitorCFFisrequired.Thecompensationcapacitoristypicallybetween100pfand33nf,andiswiredinparallelwiththeoutputvoltagesettingresistor,R2.Itprovidesadditionalstabilityforhighoutputvoltage,lowinput-outputvoltages,and/orverylowESRoutputcapacitors,suchassolidtantalumcapacitors.CFF=1/(3

28、1*1000*R2);Thiscapacitortypecanbeceramic,plastic,silvermica,etc.(BecauseoftheunstablecharacteristicsofceramiccapacitorsmadewithZ5Umaterial,theyarenotrecommended.)XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596Rev2.4 #Rev2.4 XLSEMIDatasheet3A150K

29、Hz40VBuckDCtoDCConverterXL2596XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596Rev2.4 Rev2.4 #XL2596SeriesBuckRegulatorDesignProcedure(FixedOutput)ConditionsInductor(L1)OutputCapacitor(COUT)ThroughHoleElectrolyticOutputLoadMaxInputInductancePanasonicNichiconVoltageCurrentVoltage(V)(uh)HFQSeriesPLS

30、eries(V)(A)(uf/V)(uf/V)3.33522470/25560/16722560/35560/351022680/35680/354033560/35470/352622470/25470/351033330/35330/354047330/35270/5053822470/25560/161022560/25560/251533330/35330/354047330/35270/352922470/25560/162068180/35180/354068180/35180/351231522470/25470/251833330/25330/253068180/25180/2

31、54068180/35180/2521533330/25330/252068180/25180/254015082/2582/25SurfaceMountTantalumAVXTPSSpragueSeries595DSeries(uf/V)(uf/V)330/6.3390/6.3330/6.3390/6.3330/6.3390/6.3330/6.3390/6.3330/6.3390/6.3330/6.3390/6.3220/10330/10220/10330/10220/10330/10220/10330/10220/10330/10220/10330/10100/10270/10100/10

32、270/10100/16180/16100/16180/16100/16120/20100/16120/20100/16180/16100/16120/2068/2068/25XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596Rev2.4 #Rev2.4 XL2596SeriesBuckRegulatorDesignProcedure(AdjustableOutput)OutputThroughHoleOutputElectrolyticVo

33、ltagePanasonicNichiconFeedforward(V)HFQSeriesPLSeriesCapacitor(uf/V)(uf/V)2820/35820/3533nf4560/35470/3510nf6470/25470/353.3nf9330/25330/251.5nf12330/25330/251nf15220/25220/35680pf24220/35150/35560pf28100/50100/50390pfAVXTPSSpragueFeedforwardSeries595DSeriesCapacitor(uf/V)(uf/V)330/6.3470/433nf330/6

34、.3390/6.310nf220/10330/103.3nf100/16180/161.5nf100/16180/161nf68/20120/20680pf33/2533/25220pf10/3515/50220pfSurfaceMountOutputCapacitorXLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596Rev2.4 #Rev2.4 #XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL

35、2596XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596Rev2.4 #Rev2.4 #SchottkyDiodeSelectionTableCurrent1ASurfaceMountThroughHoleVVR(Thesameassystemmaximuminputvoltage)60V20V1N581730V1N581840V1N581950VV1N58201N58211N5822VMBR320MBR330MBR340MBR350MBR360VSK32SK33SK34SK35SK363AV30WQ0330WQ0430WQ05V31DQ0

36、331DQ0431DQ05VSR302SR303SR304SR305SR306V1N58231N58241N5825VSR502SR503SR504SR505SR5065AVSB520SB530SB540SB550SB560V50WQ0350WQ0450WQ05XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596Rev2.4 Rev2.4 #XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596X

37、LSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL2596Rev2.4 #Rev2.4 #TypicalSystemApplicationfor3.3VVersionFigure6.XL2596-3.3SystemParametersTestCircuitTypicalSystemApplicationfor5VVersionFigure7.XL2596-5.0SystemParametersTestCircuitXLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL25963A150KHz40VBuckDCto

38、DCConverterXL2596Rev2.4 #Rev2.4 TypicalSystemApplicationfor12VVersionXLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL25963A150KHz40VBuckDCtoDCConverterXL2596Rev2.4 #Rev2.4 #XLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL25963A150KHz40VBuckDCtoDCConverterXL2596Rev2.4 #Rev2.4 #Figure8.XL2596-12SystemParametersTestCircuitXLSEMIDatasheet3A150KHz40VBuckDCtoDCConverterXL25963A150KHz40VBuckDCtoDCConverterXL2596Rev2.4 #Rev2.4 #XLSEMIDa