SN6505x Low-Noise 1-A Transformer Drivers for Isolated ...

1 SN6505 GNDENVCCCLKD1D2654123 EnableExt Clock10 F10 FVOUTVCCC opyright 2016, Texas Instruments IncorporatedProductFolderOrderNowTechnic alDocumentsTools &SoftwareSupport &CommunityAn IMPORTANTNOTICEat the end of this datasheetaddressesavailability,warranty, changes,use in safety-criticalapplications,intellectual propertymattersand ,SN6505 BSLLSEP9H SEPTEMBER2015 REVISEDJULY2019SN6505xLow-Noise1-A TransformerDriversfor IsolatedPowerSupplies11 Features1 Push-pulldriverfor transformers to V Highoutputdrive:1 A at 5 V supply Low max at V supply Ultra-lowEMI Spreadspectrumclocking Precisioninternaloscillatoroptions:160 kHz(SN6505A)and 420 kHz (SN6505B) Synchronizationof multipledeviceswith externalclockinput Slew-ratecontrol A Current-limit Low shutdowncurrent:<1 A Thermalshutdown Widetemperaturerange.

2 55 C to 125 C Small6-PinSOT23(DBV)package Soft-startto reduceIn-rushcurrent2 Applications Isolatedpowersupplyfor CAN,RS-485,RS-422,RS-232,SPI, I2C, low-powerLAN Low-noiseisolatedUSBsupplies Processcontrol Telecomsupplies Radiosupplies Distributedsupplies Medicalinstruments Precisioninstruments Low-noisefilamentsupplies3 DescriptionTheSN6505xis a Low-Noise ,low-EMIpush-pulltransformerdri ver,specificallydesignedfor smallformfactor, driveslow-profile,center-tappedtransform ersfroma to5 V DC EMIareachievedby slewratecontrolof the outputswitchvoltageandthroughSpreadSpect rumClocking(SSC).TheSN6505xconsistsof an oscillatorfollowedby a gatedrivecircuitthatprovidesthecomplemen taryoutputsignalsto 1-A Power-MOSFET switchesto switchingclockcanalso be providedexternallyfor accurateplacementofswitcherharmonics,or A currentlimiting,under-voltagelockout,the rmalshutdown, a soft-startfeaturethat preventshighinrushcurrentduringpowerup a 160 kHz internaloscillatorfor applicationsthatneedto minimizeemissionswhereasSN6505 Bhas a 420 kHz internaloscillatorsfor SN6505xis availableina small6-pinSOT23 characterizedfor a temperaturerangefrom 55 C to 125 (1)PARTNUMBERPACKAGEBODYSIZE(NOM)SN6505 ASOT23(6 Pin) (1)

3 For all availablepackages,see the orderableaddendumatthe end of the ,SN6505 BSLLSEP9H SEPTEMBER2015 :SN6505 ASN6505 BSubmitDocumentationFeedbackCopyright 2015 2019,TexasInstrumentsIncorporatedTableof Contents1 Pin Configurationand , , Applicationand Deviceand Mechanical,Packaging,and RevisionHistoryChangesfromRevisionG (November2018)to RevisionHPage Table3 AddedEPC3668G-LFtransformerto Table3 AddedDA2303-ALtransformerto Table3 AddedDA2304-ALtransformerto Table3 (September2016)to RevisionGPage Madeeditorialcorrectionsand modificationsthroughoutthe AddedSoft-Startdescriptionin Changed3 V to in the descriptionof ChangedSchottkydiodeRB168M-40to RB168MM-40in Changedfminto 138 kHz for SN6505 Aand 363 kHz for SN6505 Bin V-t ProductCalculationsectionand Changedload current,VDO-max, VO-max, RDS-maxand ID-maxvaluesand updatedEquation11 in ChangedLDOfrom'No' to 'Yes' for transformerORDERNO.

4 750313638and 750313626in Table3 ..25 (August2016)to RevisionFPage Changedtext From:"connectedas possible" To: "connectedas closeas possible" inPowerSupplyRecommendations283SN6505A, SEPTEMBER2015 REVISEDJULY2019 ProductFolderLinks:SN6505 ASN6505 BSubmitDocumentationFeedbackCopyright 2015 2019,TexasInstrumentsIncorporatedChanges fromRevisionD (August2016)to RevisionEPage ChangedTable3, and addedNote1 ..25 ChangesfromRevisionC (August2016)to RevisionDPage TypicalCharacteristics,SN6505A, addedFigure1 and Figure2 backinto the TypicalCharacteristics,SN6505A, addedFigure9 to Figure33 backinto the TypicalCharacteristics,SN6505B, addedFigure11 and Figure12 backinto the TypicalCharacteristics,SN6505B, addedFigure31 and Figure32 backinto the (February2016)to RevisionCPage ChangedtheTypicalCharacteristics, AddedtheTypicalCharacteristics, (October2015)to RevisionBPage ChangedtheThermalInformationtableFrom:16 Pin DW (SOIC)To: 6 Pin DBV(SOT-23).

5 5 ChangesfromOriginal(September2015)to RevisionAPage ,SN6505 BSLLSEP9H SEPTEMBER2015 :SN6505 ASN6505 BSubmitDocumentationFeedbackCopyright 2015 2019,TexasInstrumentsIncorporated5 Pin Configurationand FunctionsDBVP ackageSOT-23(6 Pin)Top ViewPin the first the outerterminalsof thecentertap throughthesepins,theirexternaltracesshou ldbe kept is the devicesupplypin. It shouldbe bypassedwith a F or greater,low , an internalundervoltagelockoutcircuittrips and the the outerterminalsofthe centertap throughthesepins,theirexternaltracesshou ldbe kept connectedto the sourceof the powerMOSFET switchesvia an throughit, the GNDterminalsmustbe connectedto a EN pin turnsthe deviceon or off.

6 Groundingor leavingthis pin floatingdisablesall unusedthis pin shouldbe tied directlyto pin is usedto run the devicewith is pulleddownto validclockis not detectedon this pin, the deviceshiftsautomaticallyto , SEPTEMBER2015 REVISEDJULY2019 ProductFolderLinks:SN6505 ASN6505 BSubmitDocumentationFeedbackCopyright 2015 2019,TexasInstrumentsIncorporated(1)Stre ssesbeyondthoselistedunderAbsoluteMaximu mRatingscausepermanentdamageto the stressratingsonlyand functionaloperationof the deviceat theseor any otherconditionsbeyondthoseindicatedunder RecommendedOperatingConditionsis not absolute-maximum-ratedconditionsfor extendedperiodsaffectsdevicereliability.

7 (2)All voltagevaluesexceptdifferentialI/O bus voltagesare with respectto the localgroundterminal(GND)and are peakvoltagevalues.(3)Maximumvoltageof (unlessotherwisenoted)(1). All typicalvaluesare at TA= 25 C, VCC= 5 (2)VCC , CLK + (3)OutputswitchvoltageD1, D216 VPeakoutputswitchcurrentI(D1)Pk, I(D2) ,TJ-55150 CStoragetemperaturerange,Tstg 65150 C(1)JEDEC documentJEP155statesthat 500-VHBM allowssafe manufacturingwith a standardESDcontrolprocess.(2)JEDEC documentJEP157statesthat 250-VCDM allowssafe manufacturingwith a (ESD)ElectrostaticdischargeHumanbodymode l(HBM),per ANSI/ESDA/JEDECJS-001,all pins(1) 6000 VChargeddevicemodel(CDM),per JEDEC specificationJESD22-C101,all pins(2) , ID2 Outputswitchcurrent- < VCC< V < VCC< V1 TAAmbienttemperature 55125 C(1)For moreinformationabouttraditionaland new thermalmetrics,see (1)SN6505 UNITDBV(SOT-23)6 PINSR C/WR JC(top)Junction-to-case(top) C/WR C/W C/W C/WR JC(bottom)Junction-to-case(bottom)therma lresistanceN/A C/W6SN6505A,SN6505 BSLLSEP9H SEPTEMBER2015.

8 SN6505 ASN6505 BSubmitDocumentationFeedbackCopyright 2015 2019, recommendedoperatingconditions, typicalvaluesare at TA= 25 C, VCC= 5 (Vcc)SupplyCurrent( V < VCC< )(SN6505A)RL= 50 ( V < VCC< )(SN6505B)RL= 50 EN and CLKpinEN / CLK= VCC1020 AIDISVCC currentfor EN = AILKG(D1)ILKG(D2)LeakageCurrenton D1,D2for EN=0 Voltageof D1,D2= AVCC+(UVLO) (UVLO) (UVLO1) (ON)EN, CLKpin logichigh (OFF)EN, CLKpin logiclow (HYS)EN, CLKpin , D2 averageswitchingFrequency(SN6505A)RL= 50 to VCC; Referto Figure36138160203 KhzD1, D2 averageswitchingFrequency(SN6505B)RL= 50 to VCC; Referto (EXT)Externalclockfrequencyon CLKpin(SN6505A)100600kHzExternalclockfre quencyon CLKpin(SN6505B)1001600kHzOUTPUTSTAGEDMMA verageON time mismatchbetweenD1and D2RL= 50 0%R(ON)Outputswitchon resistanceVCC= V, ID1,ID2= 1 VCC= V, ID1,ID2= 1 VCC= , ID1,ID2= V(SLEW)Voltageslewrateson D1 and D2 forSN6505 ARL= 50 to VCC; Referto Figure3648V/ sI(SLEW)Currentslewratesat D1 and D2 forSN6505 ARL= 5 throughtransformer;Referto Figure3711A/ sV(SLEWHF)Voltageslewrateson D1 and D2 forSN6505 BRL= 50 to VCC; Referto Figure36152V/ sI(SLEWHF)Currentslewratesat D1 and D2 forSN6505 BRL= 5 throughtransformer.

9 Referto Figure3741A/ sILIMC urrentclamplimit ( V < VCC< ) ( < VCC< V) +TSDturn on temperature154168181 CTSD-TSDturn off temperature135150166 CTSD-TSDhysteresis1317 C7SN6505A, SEPTEMBER2015 REVISEDJULY2019 ProductFolderLinks:SN6505 ASN6505 BSubmitDocumentationFeedbackCopyright 2015 2019, internalclockin caseof invalidexternalclock1025 sOUTPUTSTAGEtBBMB reak-before-maketime(SN6505A)Measuredas voltagewith RL= 50 to VCC,Referto Figure36115nsBreak-before-maketime(SN650 5B)Measuredas voltagewith RL= 50 to VCC,Referto Figure3690nsSOFT-STARTtSSSoft-starttime1 0%to 90%transitiontime on VOUTW ithtransformerCLOAD= 40 FRL= 5 delayFrompowerup to 90%transitiontime onVOUTW ithtransformerCLOAD= 40 FRL= 5 Current (mA)Output Voltage (V) Current (mA)Efficiency (%)0100200300400500600700800900100001020 30405060708090100D031 Load Current (mA)Output Voltage (V) Current (mA)

10 Efficiency (%)0100200300400500600700800900100011000 102030405060708090100D029 Load Current (mA)Efficiency (%)2512522532542552562572582592501020304 05060708090100D006 VCC = VVCC = 5 VLoad Current (mA)Output Voltage (V)25125225325425525625725825925123456 VCC = VVCC = 5 V8SN6505A,SN6505 BSLLSEP9H SEPTEMBER2015 :SN6505 ASN6505 BSubmitDocumentationFeedbackCopyright 2015 2019, ,SN6505 ASN6505A+ Wurth750315240 Figure1. OutputVoltagevs LoadCurrentSN6505A+ Wurth750315240 Figure2. Efficiencyvs LoadCurrentSN6505A+ Wurth750316031 VCC= VFigure3. OutputVoltagevs LoadCurrentSN6505A+ Wurth750316031 VCC= VFigure4. Efficiencyvs LoadCurrentSN6505A+ Wurth750316032 VCC= VFigure5.