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HT7L5610 Datasheet(PDF) 5 Page - Holtek Semiconductor Inc

No. de Pieza. HT7L5610
Descripción  Primary Side Regulation Off Line LED Driver with Active PFC
Descarga  9 Pages
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Fabricante  HOLTEK [Holtek Semiconductor Inc]
Página de inicio  http://www.holtek.com
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HT7L5610 Datasheet(HTML) 5 Page - Holtek Semiconductor Inc

   
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Rev. 1.00
5
September 08, 2015
HT7L5610
Figure 9. Temperature vs. High AC Voltage
Functional Description
TheHT7L5610isasingle-stageprimary-sideoffline
LEDcontrollerdesignedforisolatedLEDlighting
applications.ThedevicecanachievehighPower
FactorvaluesandlowTHDwithoutresortingto
additionalexternalcircuitsandcanalsogeneratehigh
accuracyLEDdrivecurrentswithveryfewexternal
components.
Start-up Current
Averylowstart-upcurrent,ISTART,allowstheselection
ofalargevaluestart-upresistorwhichreducespower
dissipation.
Power Factor Correction
Highpowerfactorvaluesareachievedbyconstant
on-timeoperation.Toimplementconstanton-time
control,a0.47µFcapacitorisplacedbetweenthe
COMPpinandground.
Constant Current Control
ThedeviceaccuratelyregulatestheLEDcurrent
bysensingtheprimary-sideinformation.TheLED
currentcanbeeasilysetusingthefollowingformula:
S
P
CS
FB
OUT
N
N
R
V
I
×
×
2
1
Where NPistheprimarywindingandNSisthe
secondarywinding;VFB(=300mV)istheinternal
voltagereferenceandRCSistheexternalcurrent
sensingresistor.
VCC Under Voltage Lockout – UVLO
ThedeviceincludesaUVLOfeaturewhichhasabout
10Vofhysteresis.ThePWMcontrollerturnsonwhen
VCCishigherthan18VandturnsoffwhenVCC
islowerthan7.5V.Thehysteresischaracteristics
guaranteethatthedevicecanbepoweredbyaninput
capacitorduringstart-up.Whentheoutputvoltage
increasestoacertainvalueafterstart-up,VCCwillbe
chargedbyanoutputthroughanauxiliarywinding.
Boundary Conduction Mode – BCM
ThepowerMOSFETisturnedonbyinductorcurrent
zero-crossingdetection.Thecurrentzero-crossing
canbedetectedbyaZCDvoltage.Whentheinductor
currentisatthezerocrossingpoint,thevoltage
ontheZCDpinwilldroprapidly.TheHT7L5610
thendetectsthefallingedgeandturnsonthePower
MOSFET.Theboundaryconductionmodeprovides
lowturn-onswitchinglossesandhighconversion
efficiency.
LEB on CS – Leading-Edge Blanking
EachtimetheinternalpowerMOSFETisswitched
on,aturn-onspikewillinevitablyoccuratthesense
resistor.Toavoidfaultytriggering,a400nsleading-
edgeblanktimeisgenerated.Duringthisblanking
period,thecurrent-limitcomparatorisdisabledand
canthereforenotswitchoffthegatedriver.
OVP on VCC – Over Voltage Protection
InordertopreventPWMcontrollerdamage,the
deviceincludesanOVPfunctiononVCC.Should
theVCCvoltagebehigherthantheOVPthreshold
voltage of 24V, the PWM controller will stop
operating immediately.When theVCC voltage
decreasesbelowtheUVLOofflevel,thecontroller
willreset.


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