lnk302芯片资料

Table1.OutputCurrentTable.Notes:1.Typicaloutputcurrentinanon-isolatedbuckconverter.Outputpowercapabilitydependsonrespectiveoutputvoltage.SeeKeyApplicationsConsiderationsSectionforcompletedescriptionofassumptions,includingfullydiscontinuousconductionmode(DCM)operation.2.Mostlydiscontinuousconductionmode.3.Continuousconductionmode.4.Packages:P:DIP-8B,G:SMD-8B,D:SO-8C.LNK302/304-306LinkSwitch-TNFamilyLowestComponentCount,Energy-EfficientOff-LineSwitcherICFigure1.TypicalBuckConverterApplication(SeeApplicationExamplesSectionforOtherCircuitConfigurations).ProductHighlightsCostEffectiveLinear/CapDropperReplacement•Lowestcostandcomponentcountbuckconvertersolution•Fullyintegratedauto-restartforshort-circuitandopenloopfaultprotection–savesexternalcomponentcosts•LNK302usesasimplifiedcontrollerwithoutauto-restartforverylowsystemcost•66kHzoperationwithaccuratecurrentlimit–allowslowcostoff-the-shelf1mHinductorforupto120mAoutputcurrent•Tighttolerancesandnegligibletemperaturevariation•Highbreakdownvoltageof700Vprovidesexcellentinputsurgewithstand•FrequencyjitteringdramaticallyreducesEMI(~10dB)–minimizesEMIfiltercost•Highthermalshutdowntemperature(+135°Cminimum)MuchHigherPerformanceoverDiscreteBuckandPassiveSolutions•Supportsbuck,buck-boostandflybacktopologies•Systemlevelthermaloverload,outputshort-circuitandopencontrolloopprotection•Excellentlineandloadregulationevenwithtypicalconfiguration•Highbandwidthprovidesfastturn-onwithnoovershoot•Currentlimitoperationrejectslineripple•Universalinputvoltagerange(85VACto265VAC)•Built-incurrentlimitandhystereticthermalprotection•Higherefficiencythanpassivesolutions•Higherpowerfactorthancapacitor-fedsolutions•EntirelymanufacturableinSMDEcoSmart®–ExtremelyEnergyEfficient•Consumestypicallyonly50/80mWinself-poweredbucktopologyat115/230VACinputwithnoload(optofeedback)•Consumestypicallyonly7/12mWinflybacktopologywithexternalbiasat115/230VACinputwithnoload•MeetsCaliforniaEnergyCommission(CEC),EnergyStar,andEUrequirementsApplications•Appliancesandtimers•LEDdriversandindustrialcontrolsDescriptionLinkSwitch-TNisspecificallydesignedtoreplacealllinearandcapacitor-fed(capdropper)non-isolatedpowersuppliesintheunder360mAoutputcurrentrangeatequalsystemcostwhileofferingmuchhigherperformanceandenergyefficiency.®LinkSwitch-TNdevicesintegratea700VpowerMOSFET,oscillator,simpleOn/Offcontrolscheme,ahighvoltageswitchedcurrentsource,frequencyjittering,cycle-by-cyclecurrentlimitandthermalshutdowncircuitryontoamonolithicIC.Thestart-upandoperatingpowerarederiveddirectlyfromthevoltageontheDRAINpin,eliminatingtheneedforabiassupplyandassociatedcircuitryinbuckorflybackconverters.Thefullyintegratedauto-restartcircuitintheLNK304-306safelylimitsoutputpowerduringfaultconditionssuchasshort-circuitoropenloop,reducingcomponentcountandsystem-levelloadprotectioncost.AlocalsupplyprovidedbytheICallowsuseofanon-safetygradedoptocoupleractingasalevelshiftertofurtherenhancelineandloadregulationperformanceinbuckandbuck-boostconverters,ifrequired.December2006OUTPUTCURRENTTABLE1PRODUCT4230VAC±15%85-265VACMDCM2CCM3MDCM2CCM3LNK302P/G/D63mA80mA63mA80mALNK304P/G/D120mA170mA120mA170mALNK305P/G/D175mA280mA175mA280mALNK306P/G/D225mA360mA225mA360mADCOutputWideRangeHVDCInputPI-3492-111903++FBBPSDLinkSwitch-TN2-2Rev.H12/062LNK302/304-306Figure2a.FunctionalBlockDiagram(LNK302).PI-2367-021105CLOCKJITTEROSCILLATOR5.8V4.85VSOURCE(S)SRQDCMAXBYPASS(BP)FAULTPRESENT+-VILIMITLEADINGEDGEBLANKINGTHERMALSHUTDOWN+-DRAIN(D)REGULATOR5.8VBYPASSPINUNDER-VOLTAGECURRENTLIMITCOMPARATORFEEDBACK(FB)Q6.3VRESETAUTO-RESTARTCOUNTER1.65V-VTCLOCKFigure2b.FunctionalBlockDiagram(LNK304-306).PI-3904-020805CLOCKJITTEROSCILLATOR5.8V4.85VSOURCE(S)SRQDCMAXBYPASS(BP)+-VILIMITLEADINGEDGEBLANKINGTHERMALSHUTDOWN+-DRAIN(D)REGULATOR5.8VBYPASSPINUNDER-VOLTAGECURRENTLIMITCOMPARATORFEEDBACK(FB)Q6.3V1.65V-VT2-3LNK302/304-3063Rev.H12/06PinFunctionalDescriptionDRAIN(D)Pin:PowerMOSFETdrainconnection.Providesinternaloperatingcurrentforbothstart-upandsteady-stateoperation.BYPASS(BP)Pin:Connectionpointfora0.1μFexternalbypasscapacitorfortheinternallygenerated5.8Vsupply.FEEDBACK(FB)Pin:Duringnormaloperation,switchingofthepowerMOSFETiscontrolledbythispin.MOSFETswitchingisterminatedwhenacurrentgreaterthan49μAisdeliveredintothispin.SOURCE(S)Pin:ThispinisthepowerMOSFETsourceconnection.ItisalsothegroundreferencefortheBYPASSandFEEDBACKpins.LinkSwitch-TNFunctionalDescriptionLinkSwitch-TNcombinesahighvoltagepowerMOSFETswitchwithapowersupplycontrollerinonedevice.UnlikeconventionalPWM(pulsewidthmodulator)controllers,LinkSwitch-TNusesasimpleON/OFFcontroltoregulatetheoutputvoltage.TheLinkSwitch-TNcontrollerconsistsofanoscillator,feedback(senseandlogic)circuit,5.8Vregulator,BYPASSpinunder-voltagecircuit,over-temperatureprotection,frequencyjittering,currentlimitcircuit,leadingedgeblankinganda700VpowerMOSFET.TheLinkSwitch-TNincorporatesadditionalcircuitryforauto-restart.OscillatorThetypicaloscillatorfrequencyisinternallysettoanaverageof66kHz.Twosignalsaregeneratedfromtheoscillator:themaximumdutycyclesignal(DCMAX)andtheclo