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1、SwitchingTypeLEDDriverQX9910GeneralDescriptionQX9910isahighlyefficient,stableandreliablehigh-brightnessLEDlightscontrolledconstantcurrentdriverIC,built-inhigh-precisioncomparators,off-timecontrolcircuit,thecurrentdriveandothercircuits,especiallyforhigh-power,highbrightnessLEDlightmorethanstringconst
2、antcurrentdriver.QX9910fixedoff-timecontrolmode,theoperatingfrequencyupto2.5MHz,allowstheexternalinductorandfiltercapacitor,thevolumedecreaseefficiency,off-timeminimumtime,throughanexternalresistorandcapacitorset,theoperatingfrequencycanbechangedaccordingtouserrequirements.PWMsignalattheEN-endedandc
3、anadjustthebrightnessofLEDlights.Byadjustingtheexternalresistance,highbrightnessLEDlampcancontrolthedrivecurrenttoachievethedesiredLEDbrightnessconstantbrightness,highbrightnessLEDlightstreamingfromafewmilliampsofcurrentto1Ampchange.FeaturesProgrammableLEDdrivecurrentprogrammedrangeofafewmilliampsto
4、1amp.Highefficiency:betterthan90%Wideinputvoltagerange：2.5V400VHighfrequencyAdjustableoperatingfrequency:10KHz-2.5MHzStrongLEDlightfunctiondrive:LEDlightstringfromonetohundredsofhighbrightnessLEDlampsPWMadjustablebrightness：ByEN-side,adjusttheLEDbrightnessApplications220VACpowersupplyLEDlights;RGBLE
5、Dlightsbigscreen;220VACpower1.EDlamp;LEDbacklightingflatpaneldisplays;LEDtrafficwarninglights;Constantcurrentchargercontrol;Universalconstantcurrentsource.PinrssT78TOvssT78VDDEN2S0P8-TTOFFEN2MSOP8TT0FFNC巨QX9910S6CSNC3QX9910M6CSGDiTDRVGDTdrPinarrangementPinNo.PinNameDescription1VSSGround2ENChipEnable
6、3NCNoconnection4GNDVbltagefeedback5DRVDriver6CSCurrentsensing7TOFFOfftimeselection8VDDPowersply(2V6.5V)MaximumratedparametervaluesTyPeSymbolDescnptionVahIeUnitVoltageVmaxMaximumvoltageon*DDpins8VVnmviuaxVoltagerangeonEN.CSandFBPinS-0.3-VDD+03VThermalTmIn-maxOperationteneraturerange-20-85TstorageStor
7、agetemperaturerange-40-165ESDVESDESDvoltageforhumanbodymodel2000VElectricalCharacteristicsParameterSymbolTestConditionMinTyPMaxUnitPowersupplyVDD2.56.5VCSpinfeedbackvoltageVcs240250260mVOperationcurrentIDD0.51mAOfftime(WithoUtROFFandCOFF)Toffo620nsStandbycurrentEDDQ1uAENpiuhighlevelvoltageVENH2.0VEN
8、piulowlevelvoltageVENL0.8VDRRisingTimeTwSE5OOpFcaponDRVPln50nsDRFaUingTimeTfLL5OOpFcaponDRVpin50nsTypicalApplicationCircuitMainApplicationCityExchange220VpowersupplyLEDlightingapplicationsGreatmeritofhighbrightnessLEDlamps,thecaseforthesamebrightness,savingapproximately80%morethanincandescent,widely
9、ACpowerlightingapplications,agreatalternativetoboththepowergradually,fever,shortlifeincandescenttrend.QX9910particularlysuitablefor110V220VACpowerforlighting,typicalapplicationshowninFigure1,220VACrectifiedthroughtherectifierbridge,willreceiveabout310VDCvoltage.AsQX9910VDDpowersupplyis5.1V,sothrough
10、aresistorandaregulatortotheICpowersupply.IntheMOSFETcontrolvoltageishigh,MOSFETpowerswitchturnson,inductorLstoresenergywhenthecontrolvoltageislow,MOSFEToff,inductorreleasesenergythroughtheSchottkydiodecircuittolightupLEDlightsstring.Circuitparameters:1.LEDaveragecurrentInFigure1,workingincontinuousm
11、ode,LEDcurrentIL,theaverageshowninFigure2.IlmaxisLEDlampbythemaximumcurrent.2.DeterminetheoperatingfrequencyFrequencybytheTOFFpinconnectedtotheROSCandCOSCset,ROSCreceivedaVDDterminal,ROSCresistancethesmallerthehigherthefrequency,COSClarger,lowerfrequency.Theleveloftheoperatingfrequencyisdeterminedba
12、sedonactualusage.Thehigheroperatingfrequency,theinductorcanbesmaller,thelowerthecostoftheinductor.1.EDlight-drivendutycycleD=Vout/Vin.FortheMOSFET,on-timeTON,TOFFofftimefortheMOSFET,(restingstage).Telogeniscalculatedasfollows:Toff Roff + 100K (Coff + 10 pF)IfpinisnotconnectedresistorsandcapacitorsTO
13、FFis:Toff=0.51100KQT0pF=5107s1I-DCircuitoperatingfrequencyiscalculatedasfollows:尸=TToffIfTOFFfeetto1OOOPcapacitance,TOFF=51ms,D=0.1,Fisthecircuitoperatingfrequencyisabout20KHz.3 .ChoiceofinductorLInductanceLoftheselectionprincipleistoensurethatflowthroughtheinductorcurrentchangeismuchlessthanthemaxi
14、mumcurrentthroughtheinductorvalue.Innormaloperation,theinductorisinastateofchargeanddischarge,whentheinputvoltageandoutputvoltageofthepressureishigh,increasethevalueoftheinductor,whenthepressure-hour,youcanuseasmallerinductor.Inordertoreducefluctuationsincurrentflowingthroughtheinductor,thecircuitshouldoperateincontinuousmode.Incontinuousmode,ILminimum.Intherestingstage,flowthroughtheLEDlightsILcalculatedasfollows:aVOUT_1.AlL=TFF1.InordertoflowthroughtheLEDlampcurrentfluctuationislessthanILinductancerVOUTTshouldsatisfy:LToff7zGeneralvaluetomorethanafewhundredmicro-HangHangcents,dependingonthe
