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HT7L2103 Datasheet(PDF) 6 Page - Holtek Semiconductor Inc

Part # HT7L2103
Description  Anti-EMI, High Efficiency Dimmable LED Lighting Driver with Primary-Side Constant Control and Green Mode
PDF  11 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT7L2103 Datasheet(HTML) 6 Page - Holtek Semiconductor Inc

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Rev. 1.00
6
November 04, 2011
HT7L2103
Under Voltage Lockout (UVLO)
AnUVLOcomparatorisimplementedintoensure
thatthedeviceisfullyfunctionalbeforetheoutput
stageisenabled.AsshowninFig.10,ahysteresis
isprovidedtopreventthePWMControllerfrom
shuttingdownduringanyvoltagedipswhichmight
occurduringstartupprocess.Theturn-onandturn-
off threshold levels are set at 16.0V and 10.0V,
respectively.
Figure 10. UVLO Scheme and Start-Up Current
Current Sense and Leading-Edge
Blanking (LEB)
ALeading-EdgeBlankingSchemeisintegratedin
thedevicetopreventfalsetriggeringduetofeedback
currentspikeswhichmayappearontheCSpin,
furthereliminatingtheneedforanR-Cfilterwhich
isalwaysarequirementintraditionalcurrentmode
PWMControllerapplications.
Figure 11. LEB with R-C Filter Removed
Internal Slope-Compensation
Animportantissuewiththecurrentmodecontrol
structuresistheinstabilityduetoSub-Harmonic
OscillationwhentheDuty-Cycle>50%.Toprevent
thisproblemfromoccurring,aSlope-Compensation
functionisalwaysnecessary.Intraditionalcurrent
modePWMControllerapplication,manyexternal
componentsarenecessarytoimplementaSlope-
Compensationfunction,HoweverintheHT7L2103
theinternalSlope-Compensationeliminatestheneed
fortheseexternalcomponentsresultinginasimplified
theapplicationcircuitdesign.
Short-Circuit Protection (SCP) and
Over-Load Protection (OLP)
Toprotectallthedevicesinasystemfrombeing
damagedduetooverloadorshortcircuitconditions,
asmartSCPfunctionisimplementedinthedevice.
Herethefeedbacksystemwillforcethevoltageloop
tomovetowardasaturationvalueandthenpullup
thevoltageontheCOMPpin.WhenevertheVCOMP
increasestotheSCPthresholdof4.7Vandremains
thereforlongerthan40ms,theprotectionschemewill
activateandthenturnoffthegateoutputtostopthe
powercircuitswitching.Byusingsuchaprotection
mechanism,theaverageinputpowercanbereduced
toaverylowlevelsothatthecomponenttemperature
andstresscanbecontrolledwithinsafeoperating
levels.
Figure 12. SCP Function Behavior



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