MAP3204

MAP3204 MGCHIP | Alldatasheet

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n Confidential DatasheetgVersiong1.5g Febn28 th n2012.n 1 MAP3204g–g4kChannelgLEDgDrivergforgHighgBrightnessgLEDsg g n n n n n n n n n n n n n n n n n n n n n n n n n n n n n n nnn OrderinggInformationg g n g TypicalgApplicationgggg g PartgNumberg Topg Markingg Ambientg TemperaturegRange g Packageg RoHSgStatusg MAP3204SIRHn MAP3204n z40 ℃nton+85℃n 20nleadsnSOICn HalogennFreen MAP3204TERHn MAP3204n z40 ℃nton+85℃n 16nleadsnTSSOPnwithnEzPadn HalogennFreen GeneralgDescriptiong n ThenMAP3204nisnan4zchannelnLEDndrivernoptimizedn fornLEDnbacklightnapplicationntargetingnmidnandnlargen sizen LCDn module.n Itn usesn then boostn MOSFETn externallynandn4zchannelncurrentnsourcesninternallynforn drivingnhighnbrightnessnwhitenLEDsn n InputnvoltagenofnthenMAP3204nisnrangednfromn8Vn~n 36Vnandnmax.nLEDncurrentnisn150mAnpernchannel.nItn cann increasen then outputn voltagen dependingn onn then drainnvoltagenratingnofnboostnMOSFET.n n ItnfeaturesnPWMndimmingncontrolnandninternalnsoftz startn andn hasn protectionsn liken outputn overzvoltage,n Boostnoverzcurrent,nLEDnshort/open,nSBDnopennandn UVLO.n n ThenMAP3204nisnavailableninn16nleadsnEzTSSOPnandn 20nleadsnSOICnpackagenwithnHalogenzfreen(fullynRoHSn compliant).nn n n n n Featuresg n /bdash2n 8Vnton36VnInputnVoltagenRangen /bdash2n Drivenupnton4nChannelsnn /bdash2n 150mAnOutputnCurrentnpernChanneln /bdash2n ProgrammablenBoostnSwitchingnFrequencyn:n 100kHznton500kHzn /bdash2n PWMnDimmingn:nupnton22kHzn /bdash2n CurrentnModenControln /bdash2n BoostnOvernCurrentnProtectionn /bdash2n OutputnOvernVoltagenProtectionn /bdash2n LEDnShort/OpennProtectionn /bdash2n SBDnOpenn/nOutputnShortnProtectionnn /bdash2n UVLOn /bdash2n 16nleadsnEzTSSOPnandn20nleadsnSOICnn n Applicationsg n /bdash2n HighnBrightnessnwhitenLEDnbacklightingnfornmidn andnlargensizenLCDnmodulen /bdash2n GeneralnLEDnlightingnapplicationsn gMAP3204 g ggggggggggg4kchannelgLEDgDriver gforgH ighgBrightnessgLEDs g

n Confidential DatasheetgVersiong1.5g Febn28 th n2012.n 2 MAP3204g–g4kChannelgLEDgDrivergforgHighgBrightnessgLEDsg n PingConfigurationg g nnnnnnnnnnnnnnnnnnnn n n 16nleadsnEzTSSOPnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn20nleadsnSOICn ggg g FunctionalgBlockgDiagramg g Current Generator Headroom Control Vref -PWM Controller 1.28V OSC S R Q 5VnLDO GATE FB1 FB2 FB3 FB4 FSW OVP VDD COMP GND PWMI EN CS LED Open/Short Protection Slope Compensation 10VnLDO VCC ISET 0.1V ThermalnShutdown SBDnOpen/ OutputnShort VLDO 1.2V CurrentnSense Amp

n Confidential DatasheetgVersiong1.5g Febn28 th n2012.n 3 MAP3204g–g4kChannelgLEDgDrivergforgHighgBrightnessgLEDsg g PingDescriptiong n Nameg 16leadsgEk TSSOPg 20leadsgSOIC g Descriptiong VCCn 16g 1g Powernsupplyninput.nNeednexternalninputncapacitor.n GNDn 4,g13g 5,g17g Groundn VDDn 1g 2g Internaln10VnRegulatornOutput.nConnectnton2.2uFncapacitorn FSWn 2g 3g Boosternswitchingnfrequencynadjustmentnpinn(Noten1)n COMPn 3g 4g Internalnerrornamplifierncompensationnpinn(Noten2)n ISETn 5g 6g Max.nLEDncurrentnadjustmentnpinn(Note3)n ENn 7g 8g Enablenpin.nActivenHigh.n PWMIn 6g 7g PWMnsignalninputnforndimmingn(Noten4)n FB1n 11g 12g LEDncurrentnsinknfornCh1n FB2n 10g 11g LEDncurrentnsinknfornCh2n FB3n 9g 10g LEDncurrentnsinknfornCh3n FB4n 8g 9g LEDncurrentnsinknfornCh4n OVPn 12g 15g Overnvoltagensensenpinn(Noten5)n CSn 14g 19g Boostncurrentnsensenpinn(Noten6)n GATEn 15g 20g GatendrivernoutputnfornexternalnpowernMOSFETn VLDOn kg 16g Internaln5VnRegulatornOutput.nConnectnton2.2uFncapacitorn NCn kg 13,g14,g18g Connectntongroundnfornheatzsinkingnpurposen zn ExposednPAD g kg Connectntongroundnbynmultiplenviasnfornheatzsinkingnpurposen (Noten7)n n Noteg1:nConnectnexternalnresistorntonsetnthenoscillatornfrequencynfromn100kHznton500kHz.n Noteg2:nConnectnexternalncapacitornandnresistorntonCOMPnpin.nReferntonantypicalnapplicationndiagram.n Noteg3 :nThenresistornvaluenonnISETnpinnwillncontrolnthenfullnscalenlevelnofnsinkncurrentnonnFBznpins.nDonnotnleaventhisnpinnopen.n Noteg4:nThisnexternalnPWMnsignalnisnusednfornbrightnessncontrol.n Noteg5:nConnectncenternnodenofnresistivenvoltagendividernfromnoutputntonground.nReferntonantypicalnapplicationndiagram.n Noteg6:nConnectnexternalnresistorntonPGNDntonsensenthenexternalnpowernMOSFETndrainncurrent.n Noteg7:nNotnconnectedninternally.n

n Confidential DatasheetgVersiong1.5g Febn28 th n2012.n 4 MAP3204g–g4kChannelgLEDgDrivergforgHighgBrightnessgLEDsg n AbsolutegMaximumgRatings (Noteg1) n n n Symbolg Parameterg Ming Maxg Unitg VCC n SupplynVoltagen z0.3n 36n Vn VGATE n GatenDrivernOutputn z0.3n 14n Vn VVDD n VDDnPinn z0.3n 14n Vn VEN ,nV CS ,nV PWMI ,nV COMP ,nV OVP ,nV FSWn VISET n InputnVoltagenSignalnLevelnonnEN,nCS,nPWMI,nCOMP,nOVP,n FSW,nISETn z0.3n 7n Vn VFB1~4 n LEDnCurrentnSinknPinn z0.3n 65n Vn IFB1~4 n LEDnCurrentnSinknPinn n 200n mAn TPAD n SolderingnLead/nPadnTemperaturen10secnn n 300n °Cn TJn JunctionnTemperaturen z40n +150n °Cn TSn StoragenTemperaturen z65n +150n °Cn ESDn HBMnonnAllnPinsn(Noten2)n z2000n +2000n VnMMnonnAllnPinsn(Noten3)n z200n +200n n Noteg1 :nStressesnbeyondnthenabovenlistednmaximumnratingsnmayndamagenthendevicenpermanently.nOperatingnaboventhenrecommendedn conditionsnfornextendedntimenmaynstressnthendevicenandnaffectndevicenreliability.nAlsonthendevicenmaynnotnoperatennormallynaboventhen recommendednoperatingnconditions.nThesenarenstressnratingsnonly.n Noteg2 :nESDntestednpernJESD22Az114.n Noteg3 :nESDntestednpernJESD22Az115.n n n nnn RecommendedgOperatinggConditionsg(Noteg1) g n Parameterg Ming Maxg Unitg VCC n SupplynInputnVoltagen 8n 36n Vn IFB1~4n LEDnCurrentnSinknPinn 50n 150n mAn VFB1~4 n LEDnCurrentnSinknPinn n 65n Vn TAn AmbientnTemperaturen(Noten2)n z40n +85n °Cn n Noteg1 :nNormalnoperationnofnthendevicenisnnotnguaranteednifnoperatingnthendevicenovernoutsidenrangenofnrecommendednconditions.n Noteg2:nThenambientntemperaturenmaynhaventonbenderatednifnusedninnhighnpowerndissipationnandnpoornthermalnresistancenconditions.n n n PackagegThermalgResistanceg(Noteg1) g n Parameterg θJAg θJCg Unitg MAP3204SIRHn 20nLeadsnSOICn 54n 26n ℃/Wn MAP3204TERHn 16nLeadsnEzTSSOPn 46n 8n ℃/Wn n Noteg1 :nMeasurednonnJESD51z7,nMultizlayernPCBn n

n Confidential DatasheetgVersiong1.5g Febn28 th n2012.n 5 MAP3204g–g4kChannelgLEDgDrivergforgHighgBrightnessgLEDsg g ElectricalgCharacteristicsg n Unlessnnoted,nVIN n=n12V,nCIN n=n1.0 µF,nandntypicalnvaluesnarentestednatnT An=n25 °C.n Boldface nvaluesnindicatenz40 °Cnton+85 °CnofnT A.n n3n Parameterg TestgConditiong Ming Typg Maxg Unitg GeneralgInputgOutputg VCC n InputnVoltagenRangen n 8.0g g 36g Vn IQn QuiescentnCurrentn DrivingnFBsnatnminimumnsettingnw ithnnonloadn n 3n n mAn IGND n GroundnPinnCurrentninn Shutdownn VCCn=n12V,nV EN n=n0Vn NonLoadnCurrentnonnFBsn n 40n n µAn VEN n LogicnInputnLevelnonn ENnpinn VEN_L n:nLogicnLown n n 0.8n Vn VEN_H n:nLogicnHighn 2.0n n n REN_PULLDOWN n PullzdownnresistornonnENnpinn n n 500n n kΩn VUVLO n UnderzVoltagenLockzOutn ThresholdnVoltagenonnVDDnpinn ReleasenUVLOn n 6.0n 7.5n Vn LockoutnUVLOn 4.0n 5.5n n Oscillator n fSW n InternalnOscillatorn Frequency g RFSW =250k Ωn 180g 200g 220g kHzn RFSW =100k Ωn 450g 500g 550g Dmax n MaximumnDutynCyclen n 85n 90n n %n Referenceg VVDD n 10VnLDOnVoltagen V CC n>n12V,nNonloadncurrentn 9g 10g 11.5g Vn VLDO n 5VnLDOnVoltagen V CC n>n8V,nNonloadncurrentn 4.5g 5g 5.5g Vn BoostgMOSFETgDriver n VGATE n GatenDrivenVoltagen V IN n>n12Vn 9n 10n 11.5n Vn ISINK n GatenSourcenCurrentn n 20n n n mAn ISource n GatenSinknCurrentn n 20n n n mAn tRISE n GatenOutputnRisingnTimen 1nFnloadncapacitancen n 100n 500n nsn tFALL n GatenOutputnFallingnTimen 1nFnloadncapacitancen n 100 n 500n nsn Protectiong TSDn ThermalnShutdownn Temperaturen ShutdownnTemperaturen n 150n n °CnHysteresis,n ΔTSD n n 25n n VOVP n OverzVoltagenThresholdn LevelnonnOVPnpinn RisingnOverzVoltagenLimitnonnOVPnpinn 1.23n 1.28n 1.33 n Vn Hysteresis,n ΔVOVP n 0.05n n 0.12n VLEDSHORT n LEDnShortnProtectionn Thresholdn FB1n~nFB4n n 5.5n n Vn VSBDOPEN n SBDnOpennProtectionn ThresholdnonnOVPnpinn n n 0.1n n Vn tSCP n LEDnShortnProtectionnTimen f SW =500kHzn(Noten2)n n 8.192n n msn VCS n BoostnOvernCurrentn ProtectionnThresholdn GatenDutyzCycle=90%n 0.306n 0.360n 0.414n Vn VLEDOPEN n LEDnOpennProtectionn Thresholdn ILED =50mAn n 0.05n n Vn ILED =150mAn n 0.15n n Vn LEDgCurrentgSinkgRegulatorg VFB1~4 n MinimumnFB1~FB4nvoltagenforn thenoperationntonsinkn150mAn ISET =150mAn n 0.8n g Vn IFB n CurrentnAccuracyn I LED =100mAn n n ±± ±±3g %n Kmn CurrentnMatchingn(Noten1)n I LED =100mAn n n ±± ±±2.5g %n IFB_max n CurrentnSinknmaxnCurrentn n n 150g n mAn PWMgInterfaceg fPWM n PWMndimmingnfrequencyn n 0.1n n 22n kHzn VPWMI n LogicnInputnLevelnonn PWMInpinn VPWMI_L n:nLogicnLown n n 0.8n Vn VPWMI_H n:nLogicnHighn 2.2n n n IPWM n LeakagenCurrentnonnPWMIn pinn VPWM =1Vn n 2n n µAn tPWMON_MIN n MinimumnOnzDutyn f PWM =1kHzn n 10n n usn n . (Note 1) (Note 2) 40961 ×= fswtscp100[%] minmax minmax ×+ −±= II IIKm

n Confidential DatasheetgVersiong1.5g Febn28 th n2012.n 6 MAP3204g–g4kChannelgLEDgDrivergforgHighgBrightnessgLEDsg g ApplicationgInformationg g CURRENTgMODEgBOOSTgSWITCHINGg CONTROLLERgOPERATIONg n ThenMAP3204nemploysncurrentnmodencontrolnboostn architecturenthatnhasnanfastncurrentnsensenloopnandnan slown voltagen feedbackn loop.n Suchn architecturen achievesnanfastntransientnresponsenthatnisnessentialnforn thenLEDnbacklightnapplication.n n DYNAMICgHEADROOMgCONTROLg n Then MAP3204n featuresn an proprietaryn Dynamicn Headroomn Controln circuitn thatn detectsn then lowestn voltagen fromn anyn ofn then FB1zFB4n pins.n Thisn lowestn channelnvoltagenisnusednasnthenfeedbacknsignalnfornthen boostncontroller.nSincenallnLEDnstacksnarenconnectedninn parallelntonthensamenoutputnvoltage,nthenothernFBnpinsn willnhavenanhighernvoltage,nbutnthenregulatedncurrentn sourcencircuitnonneachnchannelnwillnensurenthatneachn channelnhasnthensamencurrent.n n INTERNALg5V/10VgREGULATORgg n ThenMAP3204nhasnbuiltzinn5VnLDOnregulatorntonsupplyn internalnanalognandnlogicnblocks.nThenLDOnisnpowerednupn whennthenENnpinnisnLogicnHigh.nn An10VnLDOnisnusedntondrivenexternalnMOSFETnconnectedn tonthenGATEnpin.nAn2.2uFnbypassncapacitornisnrequirednforn stablenoperationnofnthenLDO.n n DIMMINGgSCHEME n n WhennPWMInsignalnstaysnatnlownleveln(<0.8V)nfornan longntime,nthenMAP3204nturnsnoffnthenboostncircuitry,n butn internaln circuitn isn enabledn son then MAP3204n increasesnthenoutputnvoltagenpromptly.nn Thenminimumndimmingnonndutynisn1%natn1kHzn=n10us.n n PARALLELgOPERATION g g EvennthenMAP3204nhasn4Chnandn150mAnLEDncurrentn capabilityn pern channel,n 2Chn andn 300mAn applicationn cannbensupportednbyntyingn2FBsninton1ch,nsonthenLEDn currentncapabilityncannbenincreasednton300mA.nn n BOOSTgSWITCHINGgFREQUENCYg gADJUSTMENTg n ThenswitchingnfrequencynofnthenMAP3204nshouldnben programmedn betweenn 100kHzn andn 500kHzn byn ann externalnresistornconnectednbetweennthenFSWnpinnandn ground.nDonnotnleaventhisnpinnopen.nThenapproximaten operatingnboostnswitchingnfrequencyncannbencalculatedn bynfollowingnequation.n n n n n n n LEDgCURRENTgADJUSTMENTg n Then fulln scalen LEDn driven currentn ofn then MAP3204n shouldnbenprogrammednupnton150mAnbynannexternaln resistornconnectednbetweennthenISETnpinnandnground.n Donnotnleaventhisnpinnopen.nThenLEDncurrentncannben setnbynfollowingntable.n n ILED [mA] RISET [kΩ] Used 4-CH Used 3-CH Used 2-CH Used 1-CH 50 216 RISET (4-CH) ⅹ1.025 RISET (4-CH) ⅹ1.05 RISET (4-CH) ⅹ1.08 60 184 70 159 80 139 90 123 100 111 110 100 120 92 130 85 140 79 150 73 n Duen ton internaln GNDn impedance,n then LEDn currentnnn increasesnwithnincreasenofnthennumbernofnopennchannel.nIfn theren aren openn channels,n specificn weightn shouldn ben multipliednton4zchannelnRISETnwithnthennumbernofnopenn channel.n Forn example,n then RISETn valuen isn 111kΩn forn 100mAnLEDncurrentnforn4zchannelnapplication,nbutninncasen ofn3zchannelnapplication,nthenRISETnshouldnbenchosennbyn Itn isn neededn finen tuningn forn thesen RISETn valuesn consideringndeviationnofnresistorsnandnetc.n n OVERgVOLTAGEgPROTECTIONg n Tonprotectnthenboostnconverternwhennthenloadnisnopen,n orn then outputn voltagen becomesn excessiven forn anyn reason,n then MAP3204n featuresn an dedicatedn overvoltagenfeedbackninput.nThenOVPnpinnisnconnectedn tonthencenterntapnofnanresistivenvoltagezdividernfromnthen highnvoltagenoutputn(seenthentypicalnapplication). nWhenn thenOVPnpinnvoltagenexceedsntypicaln1.28V,nancomparatorn turnsnoffnthenexternalnpowernMOSFET.nThisnswitchnisnrez enablednafternthenOVPnpinnvoltagendropsnhysteresis(∆OVP)n belown then protectionn threshold.n Thisn overn voltagen protectionnfeaturenensuresnthenboostnconverternfailzsafen operationnwhennthenLEDnchannelsnarendisconnectednfromn thenoutput.nn ItnisnrecommendednthatnthenOVPnvoltagenbensetnton1.2n timesnofnoutputnvoltage.nThenOVPnlevelncannbencalculatedn withnthenfollowingnequation.n n n n n nn n OVPL OVPLOVPHOVPOUT R RRV +×= 28. 1_ 50][ Ω= kRMHzf FSW sw

n Confidential DatasheetgVersiong1.5g Febn28 th n2012.n 7 MAP3204g–g4kChannelgLEDgDrivergforgHighgBrightnessgLEDsg n BOOSTgOVERkCURRENTgPROTECTIONg n Then MAP3204n featuresn OverzCurrentn Protectionn (OCP)nbynsensingnCSnpinnvoltage.nThisnCSnpinnisn usednforninductorncurrentnsensingnforncurrentnmoden controlnasnwell.nn TheninternalnOCPnsensingnvoltagendecreasesnwithn increasen ofn gaten dutyzcyclen duen ton internaln slopen compensationnwhichnensuresnstablenCCMnoperation.n Followingngraphnshowsnthenrelationshipnbetweenn DIODEg OPENg /g OUTPUTg SHORTkCIRCUITg PROTECTION n n Whenn OVPn pinn voltagen isn lessn thann 0.1V,n then MAP3204n turnsn offn then externaln MOSFET.n Thisn protectsnthendrivernfromndamagenifnthenoutputnschottkyn dioden isn open(defectiven orn poorn soldern contact),n orn outputnvoltagenisnshortntonground. gatendutyncyclenandninternalnOCPnsensingnvoltagen g g g g g g g g g g g g g g g g g Inn ordern ton avoidn touchingn then currentn limitn duringn normaln operation,n then voltagen acrossn then currentn sensingnresistornRcsnshouldnbenlessnthann80%nofnthen worstncasencurrentnlimitnvoltage.n g g g g LEDgOPENgPROTECTION n n InncasenthenvoltagenonnLEDncurrentnsinknpinsn(FB1~4)n arenbelownLEDnopennprotectionnthresholdnvoltagenduenton LEDnopen,nthenoutputnvoltagenisnboostednupntonOVPnlevel.n ThenMAP3204nautomaticallynignoresnthencorrespondingn channelnandnremainingnstring(s)nwillncontinuenoperation.n ThenoperationnisnresumednrecyclingnthenENnpinnorn applyingnancompletenpowerzonzreset(POR).n Ifnallnthenstringsnarenopen,nthenoutputnvoltagenremainsn betweennOVP_highnandnOVP_lownlevel.n g LEDgSHORTgPROTECTION n n IfnthenvoltagenatnanynofnthenFB1z4npinsnexceedsnan thresholdn ofn approximatelyn 5.5Vn duen ton LEDn shortn duringnnormalnoperation,nthenMAP3204nturnsnoffnthenn correspondingn stringn aftern LEDn shortn protectionn time(tscp)n andn then remainingn string(s)n willn continuen operation.nThenoperationnisnresumednrecyclingnthenENn pinnornapplyingnancompletenpowerzonzreset(POR).n g g TURNkOFFgSEQUENCEg g g n Ton avoidn abnormaln GATEn turnzonn atn turnzoff,n PWMIn shouldnbenturnedzoffninnadvancenofnENnoff.nn g g g g g g g g g g g g g g g g g g g g g g g g g g g g g g g Vcsn(mV) PEAKL CS CS I VR 8 . 0×=

n Confidential DatasheetgVersiong1.5g Febn28 th n2012.n 8 MAP3204g–g4kChannelgLEDgDrivergforgHighgBrightnessgLEDsg g OPERATIONgTIMINGgCHARTg g g n Afternthenenablenturnsnon,ntheninternaln5VnLDOnisnpowerednupnandntheninternalnoscillatornstartsnoscillation.nIfnthenPWMIn signalnremainsnlownatntheninitialnstate,nthengatendrivenoutputntonthenexternalnMOSFETnalsonremainsnlow,nsonthenboostn controllerndosennotnstepnupnthenoutputnvoltage.nAsnsoonnasnthenPWMInsignalnturnsnonnovernthannatnleastn1%ndutyncyclenatn fPWMI=1kHz,nthencontrollernperformsnsoftzstartnandncontinuesnregulationnthroughoutnthenPWMInonnduty.nInnthenmeantimen eachnFB’snarenturnednonnsimultaneouslynandnthenconstantncurrentnflowsnthenLEDs.nThentimingnbetweennPWMInandnFBnisn approximatelynsame.n ThenMAP3204nboostsnthenoutputnvoltagenonlyninnconditionnthatnVccnisnappliednandnENnandnPWMInisnturnedzon.nAndnitnisn guaranteednthatntherenisnnonabnormalnoperationnwithnregardntonturnzonnsequence.nButninncasenthatnVcc(Vin)nisnappliedn lastlynafternENnandnPWMInisnturnedzon,nthenstartzupncurrentnisnincreasednbecausenthenoutputnvoltagenisnboostednfromn0Vnton OVPnlevel.n IfnthenPWMInsignalnremainsnlownstatenovernthann16.4msnatn500kHznboostnswitchingnfrequencynduringnnormalnoperation,n thencontrollernregardsnitnasndimzzeroncondition.nBecausenofndischargenofnoutputncapacitornthroughnthenOVPnsensingn resistorsnduringnthendimzzerontime,nthenoutputnvoltagengettingndeclined.nSonthencontrollernperformsnsoftzstartntonboostnthen outputnvoltagenuntilnitnreachesnthenoverzvoltagezprotectionnlevelnwithnregardingnthendimmingndutyncyclenasn100%.nFornthisn reason,nsomenextranswitchingncannbenseennwhennthenonndutynofnPWMInsignalnisnlessnthanntheninternalnboostnonnperiod.n n n n n n n n n n n n n n n n n n n

n Confidential DatasheetgVersiong1.5g Febn28 th n2012.n 9 MAP3204g–g4kChannelgLEDgDrivergforgHighgBrightnessgLEDsg n EXTERNALgCOMPONENTSgSELECTIONg n gInductor Theninductornvaluenshouldnbendecidednbeforensystemn design.nBecausenthenselectionnofntheninductornaffectsn thenoperatingnmodenofnCCM(ContinuousnConductionn Mode)nornDCM(DiscontinuousnConductionnMode).nInn CCMnoperation,ninductornsizenshouldnbenbigger,nevenn thoughnthenripplencurrentnandnpeakncurrentnofninductorn cannbensmall.nInnDCMnoperation,nevennripplencurrentn andnpeakncurrentnofninductornshouldnbenlargenwhilenthen inductornsizencannbensmaller.n Then inductorn DCn currentn orn inputn currentn cann ben calculatednasnfollowingnequations.n n n n n n ηn–nEfficiencynofnthenboostnconvertern n Thennthendutynrationis,n n n n n VDn –n Forwardn voltagen dropn ofn then outputn rectifyingn dioden n WhennthenboostnconverternrunsninnDCMn(nLn<nLcritical),n itntakesnthenadvantagesnofnsmallninductancenandnquickn transientnresponse.nTheninductornpeakncurrentnis,n n n n n n Then convertern willn workn inn CCMn ifn Ln >n Lcritical,n generallyn then convertern hasn highern efficiencyn undern CCMnandntheninductornpeakncurrentnis,n n n n n nn Input Capacitor n Innboostnconverter,ninputncurrentnflowsncontinuouslyn inton then inductor;n ACn ripplen componentn isn onlyn proportionalntonthenratenofntheninductorncharging,nthus,n smallernvalueninputncapacitorsnmaynbenused.nEnsuren thenvoltagenratingnofntheninputncapacitornisnsuitablenton handlenthenfullnsupplynrange.n An capacitorn withn lown ESRn shouldn ben chosenn ton minimizen heatingn effectsn andn improven systemn efficiency.n n n n n n Output Capacitor n Thenoutputncapacitornactsntonsmoothnthenoutputnvoltagen andnsuppliesnloadncurrentndirectlynduringnthenconductionn phasen ofn then powern switch.n Outputn ripplen voltagen consistsnofnthendischargenofnthenoutputncapacitornduringn thenFETntonnperiodnandnthenvoltagendropnduentonloadn currentnflowingnthroughnthenESRnofnthenoutputncapacitor.n Thenripplenvoltagenisnshownninnfollowingnequation.n n n n n n Assumenanceramicncapacitornisnused.nThenminimumn capacitancenneedednfornangivennripplencannbenestimatedn bynfollowingnequation.n n n n n n Output Rectifying Diode n nn SchottkyndiodesnarenthenidealnchoicenfornMAP3204n duen ton theirn lown forwardn voltagen dropn andn fastn switchingn speed.n Maken suren thatn then dioden hasn an voltagen ratingn greatern thatn then possiblen maximumn outputnvoltage.nThendiodenconductsncurrentnonlynwhenn thenpowernswitchnisnturnednoff.n Loop Compensation g n nThen MAP3204n controlsn inn currentn mode.n Currentn moden easilyn achievesn compensationn byn consistingn simplensinglenpolenfromndoublenpolenthatnLCnfilernmakesn atn voltagen mode.n Inn general,n crossovern frequencyn isn selectedn fromn 1/3n ~n 1/6n rangen ofn then switchingn frequency.nIfnfcnisnlarge,ntherenisnpossibilitynofnoscillationn tonoccur,nalthoughntimenresponsengetsnbetter.n Onnthenothernhand,nifnfcnisnsmall,ntimenresponsenwillnben bad,nwhilenitnhasnimprovednstability,nwhichnmayncausen overnshootnornundernshootninnabnormalncondition.n g Layout Consideration g g AngatendrivensignalnoutputnfromnGATEnpinnbecomesn noisensource,nwhichnmayncausenmalfunctionnofnICnduenton crossntalknifnplacednbynthensidenofnannanalognline.nItnisn recommendedn ton avoidn placingn then outputn linen especiallynbynthensidenofnCS,nISET,nFSW,nOVP,nCOMPn asnfarnasnpossible. g IN OUTOUT IN V IVI DOUT DINOUT VV VVVD + +−= Lf DVI SW IN DCMpeakL ×=__ Lf DVII SW IN INCCMpeakL ×+= 2 ESRIfC DIV OUT SWOUT OUT OUT ×+× ×=∆ OUTSWOUT OUTOUTIN OUT VfV IVVC ∆×× ×−= )(

n Confidential DatasheetgVersiong1.5g Febn28 th n2012.n 10 n MAP3204g–g4kChannelgLEDgDrivergforgHighgBrightnessgLEDsg PhysicalgDimensions n n n nnnnn n n n n n n Symboln Dimensionn Minn Normn Maxn An n n 2.65n A1n 0.05n n 0.30n A2n 2.05n n 2.40n bn 0.31n n 0.51n cn 0.20n n 0.33n Dn 12.54n n 13.00n En 10.00n n 10.65n E1n 7.30n n 7.70n en 1.27nBSCn Ln 0.40n n 1.27n L1n 1.40nREFn өn 0°n n 8°n n n n n n n 20gLeadsgSOIC g (Topgview)g

n Confidential DatasheetgVersiong1.5g Febn28 th n2012.n 11 MAP3204g–g4kChannelgLEDgDrivergforgHighgBrightnessgLEDsg nn n n n n n 16gLeadsgTSSOPg (Topgview)g Symboln Dimensionn Minn Normn Maxn An n n 1.20n A1n 0.00n n 0.15n A2n 0.80n n 1.05n bn 0.19n n 0.30n Cn 0.09n n 0.20n Dn 4.90n n 5.10n D1n 2.20n n n En 6.40nBSCn E1n 4.30n n 4.50n E2n 2.20n n n en 0.65nBSCn Ln 0.45n n 0.75n L1n 1.00nREFn L2n 0.25nREFn ө1n 0°n n 8°n n MagnaChipgSemiconductorgLtd.ndoesn’tnnotnrecommendnthenusenofnitsnproductsninnhostilenenvironments,nincluding,nwithoutnlimitation,n aircraft,nnuclearnpowerngeneration,nmedicalnappliances,nandndevicesnornsystemsninnwhichnmalfunctionnofnanynproductncannreasonablyn benexpectedntonresultninnanpersonalninjury.nSeller’sncustomersnusingnornsellingnSeller’snproductsnfornuseninnsuchnapplicationsndonsonatn theirnownnrisknandnagreentonfullyndefendnandnindemnifynSeller.n MagnaChip nreservesnthenrightntonchangenthenspecificationsnandncircuitrynwithoutnnoticenatnanyntime.n MagnaChip ndoesnnotnconsidern responsibilitynfornusenofnanyncircuitrynothernthanncircuitrynentirelynincludedninnan MagnaChip nproduct. n n isnanregisteredntrademarknofnMagnaChipnSemiconductornLtd.nn MagnaChipgSemiconductorgLtd.g 891,nDaechizDong,nKangnamzGu,nSeoul,n135z738nKorean Teln:n82z2z6903z3451n/nFaxn:n82z2z6903z3668n~9n www.magnachip.com n