LM5071 Power Over Ethernet PD Controller with …

1 DC - DC Converter PWM Controller Current Mode IEEE af InterfaceUVLOS ignature DetectionClassificationVOUTF eedback+_AUXAC Adapter JackAuxiliary Power EnablePoE (+)PoE (-) Hot SwapIn-rush and Fault Current NOVEMBER2005 REVISEDAPRIL2013LM5071 PowerOverEthernetPDControllerwithAuxilia ryPowerInterfaceCheckforSamples:LM50711 FEATURESPACKAGES2 Compatiblewith12 VACA dapters TSSOP-16 80V,1 , 400mAInternalMOSFETTheLM5071powerinterfa ceportandpulsewidth DetectionResistorDisconnectFunctionmodul ation(PWM)controllerprovidesacomplete ProgrammableClassificationCurrentintegra tedsolutionforPoweredDevices(PD)thatconn ectintoPoweroverEthernet(PoE)systems.

2 ProgrammableUnder-voltageLockoutwithTheL M5071isspecificallydesignedforthePDProgr ammableHysteresisthatmustacceptpowerfrom auxiliarysources ThermalShutdownProtectionsuchasACadapter s. Theauxiliarypowerinterface AuxiliaryPowerEnablePinoftheLM5071activa testhePWMcontrollerwhentheacadapteriscon nectedtopowerthePDwhenPoE CurrentModePulseWidthModulatornetworkpow eris SupportsbothIsolatedandNon-Isolatedan80V ,400mAlineconnectionswitchandApplication sassociatedcontrolfora ErrorAmplifierandReferenceforNon-Isolate dinterfacewitha ProgrammableOscillatorFrequencyswitchmod epowersupply(SMPS)areintegratedinto ProgrammableSoft-StarttheIC.

3 80%MaximumDutyCycleLimiter,SlopeCompensa tion(-80device) 50%MaximumDutyCycleLimiter,NoSlopeCompen sation(-50device)BlockDiagram1 Pleasebeawarethatanimportantnoticeconcer ningavailability,standardwarranty,anduse in 2005 2013, VoltageRegulatorCurrent LimitBandgapRegulatorVIN < 10 VSwitch5 VFB+-UVLOUVLORTNAUX+ /DC LM5071 SNVS409E NOVEMBER2005 2005 2013, NOVEMBER2005 OR ofseverallinesenteringthePD,it is in resistordividerbetweentheAUXvoltageinputtoVEEprogramsthestartuplevelswitha highvalue(>300k ) internalpulldownresistoris presenttopullthepinlowif it is , OR d totheRJ45connectorandPSE s 48 Vsupply,it is (ifused) ,theinternalseriespassregulatoris , accomplishedusinga 2005 2013,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback3 ProductFolderLinks:LM5071LM5071 SNVS409E NOVEMBER2005 (1)(2)VIN, , (3)Wave(4seconds)260 CInfrared(10seconds)240 CVaporPhase(75seconds)219 C(1) ,seeElectricalCharacteristics.

4 TheabsolutemaximumratingofVIN, RTNtoVEEis deratedto( )at-40 C.(2)If Military/Aerospacespecifieddevicesarereq uired,pleasecontacttheTexasInstrumentsSa lesOffice/Distributorsforavailabilityand specifications.(3)Fordetailedinformation onsolderingtheplasticTSSOP package, C to125 C4 SubmitDocumentationFeedbackCopyright 2005 2013, NOVEMBER2005 REVISEDAPRIL2013 ElectricalCharacteristics(1)Specificatio nsin standardtypefaceareforTJ= +25 C :VIN= 48V,VCC= 10V,RT= .SymbolParameterConditionsMinTypMaxUnits PoweredInterfaceIOSO ffsetCurrentVIN< (ON) (OFF) > > (ON)PowerFETR esistanceI = 350mA,VIN= ILEAKSMPSBiasCurrentVEE= 0V,VIN= RTN= IINRUSHI nrushCurrentLimitVEE= 0V,RTN= 0V,RTN= ,350390420mATemp= 0 C to85 CILIMDCC urrentLimitVEE= 0V,RTN= ,Temp= -325390420mA40 C to125 CStartupRegulatorVinMinOperationalVINI nputVoltageAUX= 5V,Vcc= Vin(2) (3)1520mAVCCS upplyVCCUVLO(Rising)VccRegVccReg 300mV100mVVCCUVLO(Falling) (Icc)Cload= ,timeto20nsonsetofOUTtransition(90%) (1)MinandMaxlimitsare100%productionteste dat25 (SQC) AverageOutgoingQualityLevel(AOQL).

5 (2)TheVccregulatorrequiresanexternalsour cewhenevertheVinpinis (3) 2005 2013,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback5 ProductFolderLinks:LM5071LM5071 SNVS409E NOVEMBER2005 (1)(continued)Specificationsin standardtypefaceareforTJ= +25 C :VIN= 48V,VCC= 10V,RT= .SymbolParameterConditionsMinTypMaxUnits LeadingEdgeBlankingTime55nsCSSinkImpedan ce(clocked)2555 Soft-StartSoftstartCurrentSource71013uAO scillator(4)Frequency1175200225 KHz(RT= )Frequency2505580665 KHz(RT= ) ,timetoonsetofOUTtransitionlowMinDutyCyc leCOMP=0V0%MaxDutyCycle(-80 Device)80%MaxDutyCycle(-50 Device)50% ( LM5071 -80 DeviceOnly)toCSOutputSectionOutputHighSa turationIout= 50mA, VOUTO utputLowSaturationIout= 1nF15nsFalltimeCload= CThermalShutdown25 CHysteresisThermalResistance JAJunctiontoAmbientPWPackage125 C/W(4) 2005 2013,TexasInstrumentsIncorporatedProduct FolderLinks.

6 LM5071 -60 -40 -20020406080 100 120 BG (V)TEMPERATURE (oC)-40-20020406080100120 TEMPERATURE (oC)390392394396398400402404406 FREQUENCY (kHz)-40 -20 0 20 40 60 80 100 120 TEMPERATURE (oC) HYSTERESIS CURRENT (PA)-40 -20 0 20 40 60 80 100 120 TEMPERATURE (oC)SOFTSTART CURRENT (PA) (oC)360365370375380385390395400 DEFAULT CURRENT LIMIT (mA)05 10 15 20 25 30 35 40 45 50RT RESISTANCE (k:)OSCILLATOR FREQUENCY (kHz) NOVEMBER2005 2005 2013,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback7 ProductFolderLinks: LM5071 -60 -40 -20 0 20 40 60 80 100 120 VTH (V)TEMPERATURE (oC)0510152025123456789 VCC (V)ICC (mA)01020304050607080 INPUT VOLTAGE (V) CURRENT (mA)0LM5071 SNVS409E NOVEMBER2005 (continued) 2005 2013,TexasInstrumentsIncorporatedProduct FolderLinks:LM50715 VINAUXVEERCLASSRTNARTNOUTOUTVCCRSIGT hermal LimitUVLO+_ENVBG+_+_+_EN+_VINUVLORTN+-VI N+_Hysteresis60V2V2V-+ OK1V Figure NOVEMBER2005 2005 2013,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback9 ProductFolderLinks.

7 LM5071 CSLOGICOUTDRIVERPWM100k50kCLK SSVCC2kCLK +LEB80% MAXDUTY LIMIT (-80)50% MAXDUTY LIMIT (-50) PARSQQ+-+ +-10 PASSS lopeCompensationGenerator-50 Device HasNo SlopeCompensationCURRENTLIMITLM5071 SNVS409E NOVEMBER2005 2005 2013, NOVEMBER2005 REVISEDAPRIL2013 DETAILEDOPERATINGDESCRIPTIONTheLM5071pow erinterfaceportandpulsewidthmodulation(P WM)controllerprovidesa completeintegratedsolutionforPoweredDevi ces(PD)thatconnectintoPoweroverEthernet( PoE) ,classification,thermallimit,programmabl eundervoltagelockout, (SMPS)controlportionoftheICincludespower goodsensing,VCCregulatorunder-voltageloc kout,cycle-by-cyclecurrentlimit,erroramp lifier,slopecompensation,soft-start, 1 MHzcapableoscillatorprogrammedbya singledriveoutput, , (-80suffixonly).

8 ModesofOperationTheLM5071 PDinterfaceis designedtoprovidea , (Signature) , , , turnedoffoncetheclassificationrangevolta geis exceeded, ,thedeviceisina standbystate, ,theinternalpowerMOSFETis enabledtodelivera , potentialpowereddevicecandidate,thePSE(P owerSourcingEquipment)willapplya diodebarrelnetworkis , thenperformed;if thedetectedimpedanceis , thePSEwillconsidera theimpedanceislessthan15k orgreaterthan33k a inparallelwiththeexternalUVLO resistordivider, (causedbytheexternaldiodes)ormorethan10u Aofoffsetcurrent(biascurrent). ,thesignatureresistoris disabledbytheLM5071controlleroncetheinpu tvoltageis abovethedetectionrange(> 11V).

9 Copyright 2005 2013,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback11 ProductFolderLinks:LM5071LM5071 SNVS409E NOVEMBER2005 ,thePSEwillpresenta ,classificationisoptional,andthePSEwilld efaulttoclass0 if a validclassificationcurrentis PDclassificationis notdesired( ,Class0), classificationmodeuntilVINis (MIN)(MAX) UndervoltageLockout(UVLO) programmablelineUnderVoltageLockOut(UVLO ) ; theUVLO thresholdis notmet, exceeded,thecurrentsourceis ,thecurrentsourceis turnedoff, , remoteenable/ (UVLO release) especiallyusefulforauxiliaryinput(walltr ansformer) ( )andaninputimpedanceofapproximately350k.

10 Theinputresistorprovidesadefinedpulldown impedanceif thepinis 2005 2013,TexasInstrumentsIncorporatedProduct FolderLinks: LM5071 VINRCLASSAUXVEEVCCOUTRTFBCSCOMPSSRTNARTN +PoE+AUX- PF100 k:-PoE+VOUT100 NOVEMBER2005 , ,thepowerMOSFETis , (VIN) ,thecontrolleroutputis ,a , ( ) faultconditionwhentheconverterauxiliaryw indingis inactive, theVCCauxiliarywindingis usedwitha lowvoltageauxiliarysupply(walltransforme r), ,notethatwhenusinga verylowvoltageauxiliarysupply(<14V),a 2005 2013,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback13 ProductFolderLinks: LM5071 VINRCLASSAUXVEEVCCOUTRTFBCSCOMPSSRTNARTN +PoE+AUX- PF-PoE+VOUT100 k:100 k: LM5071 SNVS409E NOVEMBER2005 s non-invertingreferenceis settoa , implementedonthesecondarysideoftheconver terandtheinternalerroramplifieris 5 VreferenceandCOMP canbeusedasthepull-upforanoptocouplerin CurrentSenseTheLM5071providesa , smallRCfilter,locatedneartheCSpinoftheco ntroller, , (CSandARTN).