Rev. 1.20 1 June 26, 2015 Rev. 1.00 PB June 26, 2015

HT7L4661Active PFC Non-isolation Buck LED

Lighting Driver With Dimming Function

Feature Non-isolationbucktopology

WideACinputrangefrom85VACto265VAC HighPowerFactorof>0.9withoutadditionalcircuitry

Internal650VhighvoltageJFETforquickstartup

Provides5VLDOoutput

Accurateconstantcurrent( 0.4V 5 mAError Amplifier

VFB Voltage Feedback Input Threshold Tj=25C 194 200 206 mVCurrent Sense ComparatortLEB Leading Edge Blanking Time 400 ns

VOCPOver Current Protection Threshold 0.9 VOver Current Release Threshold 0.2 V

VCL Current Limit Threshold 1.3 VZero Current DetectorVZCDH Upper Clamp Voltage IZCD=300A 3 VVZCDL Lower Clamp Voltage IZCD=-2.5mA -0.2 VVZCDA Positive-Going Edge 1.5 VVZCDT Negative-Going Edge 1 VIOVP ZCD pin OVP current level 285 300 315 AtB_OVP OVP Detection Blanking Time 1 sStartertSTART Start Timer Period 40 stOFF Minimum Off Time 4 sOver Temperature Protection

OTPOver Temperature Lockout 150 COver Temperature Resume 110 C

Gater DrivertR Rise Time Co=1nF, 10%~90% 100 nstF Fall Time Co=1nF, 10%~90% 70 nsVCLAMP Gate Clamp Voltage VCC=25V 19.5 VDimmingVDIM Linear Dimming Range 0.4 3 VVsat Saturation Threshold Voltage 3 VVled(off) LED Current off Threshold Voltage 0.4 V

Note:TheseParameters,althoughguaranteed,arenot100%testedinproduction.

Rev. 1.20 5 June 26, 2015

HT7L4661

Typical Performance Characteristics

20

25

30

35

40

45

50

55

60

-40 -20 0 20 40 60 80 100 120

Star

t-up

Cur

rent

(A)

Temperature ()

500525550575600625650675700725750775800

-40 -20 0 20 40 60 80 100 120

Ope

ratin

g C

urre

nt (

A)

Temperature ()

Figure 1. Start-Up current vs. temperature Figure 2. Operation current vs. temperature

16.016.116.216.316.416.516.616.716.816.917.0

-40 -20 0 20 40 60 80 100 120

UVL

O_o

n (V

)

Temperature ()

7.57.67.77.87.98.08.18.28.38.48.5

-40 -20 0 20 40 60 80 100 120

UVL

O_o

ff (V

)

Temperature ()

Figure 3. UVLO_on vs. temperature Figure 4. UVLO_off vs. temperature

17.017.117.217.317.417.517.617.717.817.918.0

-40 -20 0 20 40 60 80 100 120

UVL

O(s

t)_on

(V)

Temperature ()

9.09.29.49.69.8

10.010.210.410.610.811.0

-40 -20 0 20 40 60 80 100 120

UVL

O(s

t)_of

f (V)

Temperature ()

Figure 5. UVLO(st)_on vs. temperature Figure 6. UVLO(st)_off vs. temperature

Rev. 1.20 6 June 26, 2015

HT7L4661

4.80

4.85

4.90

4.95

5.00

5.05

5.10

5.15

5.20

-40 -20 0 20 40 60 80 100 120

Stan

dby

Mod

e LD

O V

olta

ge (V

)

Temperature ()

4.80

4.85

4.90

4.95

5.00

5.05

5.10

5.15

5.20

-40 -20 0 20 40 60 80 100 120

Ope

ratin

g M

ode

LDO

Vol

tage

(V)

Temperature ()

Figure 7. LDO Voltage (Standby Mode) vs. Temperature

Figure 8. LDO Voltage (Operating Mode) vs. Temperature

194195196197198199200201202203204205206

-40 -20 0 20 40 60 80 100 120

VFB

(mV)

Temperature ()

Figure 9. VFB vs. Temperature

Rev. 1.20 7 June 26, 2015

HT7L4661

Functional DescriptionTheHT7L4661isauniversalAC/DCLEDdriverde-signedforLEDlightingapplications.ThedevicecanachievehighPowerFactorvalueswithoutresortingtoadditionalexternalcircuityandcanalsogeneratehigh accuracyLEDdrive currentswithvery fewexternalcomponents.Separategroundsareprovided;oneisafloatinggroundfortheHT7L4661whiletheotheroneisforground.ItisimportanttonotethatthetwogroundscannotbedirectlyconnectedtogethertoavoidICdamageandsystemmalfunction.

High Voltage Start-upDuetoitsinternalhigh-voltagestartupcircuit,whenanACvoltage isapplied to thepowersystem, thedeviceprovidesahighcurrenttochargetheexternalVcccapacitor tospeedup thesystemstartup time.Tosavepowerconsumption,after theVccvoltagehasexceededthe turn-onvoltageandentersnormaloperation,thehigh-voltagestartupcircuitisshutdown.

VCC Under Voltage Lockout UVLOThedeviceincludesaUVLOfeaturewhichincludesa6.8Vhysteresisvalue.ThePWMcontroller turnsonwhenVCCishigherthan16VandturnsoffwhenVCCislowerthan8.4V.Thehysteresischaracteristicsguaranteethatthedevicecanbepoweredbyaninputcapacitorduringstart-up.When theoutputvoltageincreasestoacertainvalueafterstart-up,VCCwillbechargedbyanoutputthroughanauxiliarywindingoraZenerDiode.VZ=VLED-VCC.

Low Dropout Regulator LDO

Alowdropout regulator (LDO) is included in thedeviceandprovidesastable5Voutputvoltageforotherdevices.When thedimvoltage is lower than0.4V,theLDOobtainsitspowerfromthehighvoltagestart-upcircuitandthedrivecurrentofLDOis1mA.Duringnormaloperation,VCCwillbechargedbyanoutput throughanauxiliarywindingoraZenerDi- throughanauxiliarywindingoraZenerDi-throughanauxiliarywindingoraZenerDi-anauxiliarywindingoraZenerDi-auxiliarywindingoraZenerDi-aZenerDi-ZenerDi-ode.Thus,thedrivingcurrentofLDOcanincreaseto5mA.

Boundary Conduction Mode BCMThepowerMOSFETisturnedonbyinductorcurrentzero-crossingdetector.Thecurrentzero-crossingcanbedetectedbyaZCDvoltage.Whentheinductorcur-aZCDvoltage.Whentheinductorcur-ZCDvoltage.Whentheinductorcur-.Whentheinductorcur-Whentheinductorcur-theinductorcur-inductorcur-rent isat thezerocrossingpoint, thevoltageontheZCDpinwilldroprapidly.Thedevice thendetectsthe fallingedgeand turnson thePowerMOSFET.Theboundaryconductionmodeprovideslowturn-onswitchinglossesandhighconversionefficiency.

Zero Current Detection ZCDTheZCDvoltageisdesignedtooperatebetween0Vand3Vfornormaloperation. If thevoltageon theZCDpinincreaseshigher than1.5V, theZCDcom-increaseshigher than1.5V, theZCDcom-higher than1.5V, theZCDcom-paratorwaitsuntil thevoltagefallsbelow1V.Whentheinductorcurrentisat thezerocrossingpoint, thevoltageontheZCDpinwilldroprapidly.Thedevicewill thendetect the1VfallingedgeandturnonthePowerMOSFET.The0.5Vofhysteresisavoidsanyfalsetriggeringactionsduetonoise.

Constant Current ControlThedevicewillsensetheoverallinductorcurrentandformaclosed-loopwithaninternalerroramplifiertoobtainhighconstantcurrentaccuracy.TheCSvoltageandthe0.2VreferencevoltageformtheinputstoaGmamplifierwhoseoutputisintegratedusinganexternalCOMPcapacitor.TheONtimeoftheMOSFETiscon-OMPcapacitor.TheONtimeoftheMOSFETiscon-capacitor.TheONtimeoftheMOSFETiscon-ONtimeoftheMOSFETiscon-timeoftheMOSFETiscon-theMOSFETiscon-MOSFETiscon-trolledbytheCOMPvoltagetoadjusttheLEDcurrent.

Leading-Edge Blanking LEB on CSEachtimetheexternalpowerMOSFETisswitchedon,aturn-onspikewill inevitablyoccuratthesenseresistor.Toavoidfaultytriggering,a400nsleading-edgeblank time is generated.As this function isprovidedconventionalRCfilteringisthereforeunnec-onventionalRCfilteringisthereforeunnec-isthereforeunnec-unnec-essary.Duringthisblankingperiod,thecurrent-limitcomparator isdisabledandcanthereforenotswitchoffthegatedriver.

Gate Driver ClampTheDRVpin is connected to thegateofexternalMOSFET tocontrol itsON/OFFfunction.Topro-tocontrol itsON/OFFfunction.Topro-.Topro-Topro-Topro-tect theexternalpowerMOSFETfrombeingover-stressed,thegatedriveroutputisclampedto17V.

Over Voltage Protection OVP on VCCInorder topreventPWMcontroller damage, thedeviceincludesanOVPfunctionforVCC.ShouldtheVCCvoltagebehigherthantheOVPthresholdvolt-behigherthantheOVPthresholdvolt-higherthantheOVPthresholdvolt-ageof29V, thePWMcontrollerwillstopoperationimmediately.WhentheVCCvoltagedecreasesbelowtheUVLOofflevel,thecontrollerwillreset.

Rev. 1.20 8 June 26, 2015

HT7L4661

LED Open Protection ZCD OVPTheLEDvoltageisreflectedontheZCDpinthrougha resistorRZCD.When the current through theRZCDresistorishigherthan300A,thenZCDOVPprotectionwill takeplace and thePWMcontrol- and thePWMcontrol-thePWMcontrol-lerwillstopoperation immediately.WhentheVCCvoltagedecreasesbelowtheUVLOofflevel,thecon-decreasesbelowtheUVLOofflevel,thecon-theUVLOofflevel,thecon-UVLOofflevel,thecon-trollerwillreset.

VOVP-ZCDcanbesetusingthefollowingequation:

ZCDOVPZCDHZCDOVP RIVV +=TheVZCDH is theupperclampvoltageof3Von theZCDpin.TheIOVPrepresents theOVPcurrent levelon theZCDpinwhichis300A.RZCDstandsfortheresistorconnectedbetweentheZCDpinandtheLEDpositiveterminal.

Over Current Protection OCPThedeviceincludesanovercurrentprotectionfunc-deviceincludesanovercurrentprotectionfunc-includesanovercurrentprotectionfunc-tionontheCSpin.Aninternalcircuitdetectsthecur-theCSpin.Aninternalcircuitdetectsthecur-CSpin.Aninternalcircuitdetectsthecur-rentlevelandwhenthecurrentislargerthantheovercurrentprotectionthresholdlevel,VOCP/RCS, thegateoutputwillremainatalowlevel.

LED Short Protection SCPTheoutputvoltagedropswhenanumberofLEDsinastringareshortedresultinginavoltagedropatVCC.Once theVCCdropsbelow8.4V, thedevicewillstopoperating.Undersuchsituations,thestart-upoperationwillrechargetheVCCpinthroughthestart-upresistorandthedevicewillentertheUVLOhiccupmode.

Thermal ProtectionAthermalprotectionfeatureisincludedtoprotectthedevicefromexcessiveheatdamage.Whenthejunc-fromexcessiveheatdamage.Whenthejunc-tion temperatureexceedsa thresholdof150C, thethermalprotectionfunctionwillturnofftheDRVter-functionwillturnofftheDRVter-willturnofftheDRVter-minal immediately.WhentheVCCdecreasesbelowtheUVLOofflevel,thecontrollerwillreset.

Dimming FunctionOntheDIMpin,whenthevoltageonthispinislowerthan0.4V, thedeviceoutputdrivingoperationwillbe shutdownand theLEDcurrentwill reduce tozeroforthiscondition.Whenthevoltageisbetween0.4Vand3V,thedevicewillbeoperatinginitslineardimmingrangeandtheLEDcurrentwillbecontrolledaccordingtothepinvoltage.Whilethepinvoltageishigherthan3V,thedevicewilloperateinitsnormaloperatingcondition.

Linear Dimming Range

Standby Mode Range

Saturation Range

Iout

0.4 3

13.3

100

Vdim(V)

Iout

(%)

Rev. 1.20 9 June 26, 2015

HT7L4661

Package Information

Notethat thepackageinformationprovidedhereisforconsultationpurposesonly.Asthis informationmaybeupdatedatregularintervalsusersareremindedtoconsulttheHoltekwebsiteforthelatestversionofthepackageinformation.

Additionalsupplementaryinformationwithregardtopackagingislistedbelow.Clickontherelevantsectiontobetransferredtotherelevantwebsitepage.

FurtherPackageInformation(includeOutlineDimensions,ProductTapeandReelSpecifications)

PackingMeterialsInformation

Cartoninformation

Rev. 1.20 10 June 26, 2015

HT7L4661

10-pin MSOP Outline Dimensions

SymbolDimensions in inch

Min. Nom. Max.A 0.043

A1 0.000 0.006A2 0.030 0.033 0.037B 0.007 0.013C 0.003 0.009D 0.118 BSC E 0.193 BSC E1 0.118 BSC e 0.020 BSC L 0.016 0.024 0.031

L1 0.037 BSC y 0.004 0 8

SymbolDimensions in mm

Min. Nom. Max.A 1.10

A1 0.00 0.15 A2 0.75 0.85Q 0.95 B 0.17 0.33 C 0.08 0.23 D 3.00 BSC E 4.90 BSC E1 3.00 BSC e 0.50 BSC L 0.40 0.60 0.80

L1 0.95 BSC y 0.10 0 8

Rev. 1.20 11 June 26, 2015

HT7L4661

Copyright 2015 by HOLTEK SEMICONDUCTOR INC.The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek assumes no responsibility arising from the use of the specifications described. The applications mentioned herein are used solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. Holtek's products are not authorized for use as critical components in life support devices or systems. Holtek reserves the right to alter its products without prior notification. For the most up-to-date information, please visit our web site at http://www.holtek.com.

FeatureApplicationsGeneral DescriptionApplication CircuitsBlock DiagramPin AssignmentPin DescriptionAbsolute Maximum RatingsRecommended Operating Ranges

Electrical CharacteristicsTypical Performance CharacteristicsFunctional DescriptionHigh Voltage Start-upVCC Under Voltage Lockout UVLOLow Dropout Regulator LDOBoundary Conduction Mode BCMZero Current Detection ZCDConstant Current ControlLeading-Edge Blanking LEB on CSGate Driver ClampOver Voltage Protection OVP on VCCLED Open Protection ZCD OVPOver Current Protection OCPLED Short Protection SCPThermal ProtectionDimming Function

Package Information10-pin MSOP Outline Dimensions