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HT7L2102 bảng dữ liệu(PDF) 5 Page - Holtek Semiconductor Inc

tên linh kiện HT7L2102
Giải thích chi tiết về linh kiện  Anti-EMI, High Efficiency Dimmable LED Lighting Driver with Green Mode and Integrated Protections
PDF  11 Pages
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nhà sản xuất  HOLTEK [Holtek Semiconductor Inc]
Trang chủ  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT7L2102 bảng dữ liệu(HTML) 5 Page - Holtek Semiconductor Inc

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Rev. 1.00
5
November 4, 2011
HT7L2102
Application Information
Operation Overview
TheHT7L2012isahighlyfunctionallyintegrated
PWMcontrollerforLEDlightingandisoptimizedto
restrictEMI.Thedeviceofferadimmingprecisionof
lessthan1%andhasadimmingrangeof1%to99%.
ItsintegratedfeaturesincludeGreenmode(Non-
Acoustic-Noise),internalslopecompensation,high
efficiencyunderdifferentloadconditionswithina
wideoperatingtemperaturerangeof-40°Cto85°C.
The devices also includes a range of protection
functions,SCP,OVP,UVLO,currentlimit,LEB,
softstart,OTPforexternalthermistorsensing.These
features not only enhance system performance,
butalsoensurehighstabilityofthewholecircuit
application even under extreme environmental
conditionssuchashightemperatureorhighEMI
levels.
Advanced Precision Oscillator for
Green-Mode Switching and Non-Acoustic
Noise Requirement
ATrimmed Precision Green Mode Oscillator is
implementedinthedevicetoenhancetheconversion
efficiencyunderlightloadconditions.AsFig.7
shows,theefficiencydifferencebetweenlightloads
andheavyloadsislessthan1%,whiletheaverage
efficiencyisonly89.5%,thepeakefficiencyis90%.
Figure 7 HT7L2102 Efficiency Performance
between Light-Load and Heavy-Load
TheGreenModeOscillatortypessuppliedbyother
PWMControllerprovidersareplaguedbyAcoustic-
Noiseproblems.Thisisbecause,underlightload
conditions, the frequency will keep decreasing
throughtheHumanAcousticRange(from20Hz
to20kHz),andtheseaudiofrequenciesmaycreate
audiblenoiseinthetransformer.Holtek’sHT7L2102
patentedGreenModeOscillatordesignedusingan
advancedNon-AcousticNoisestructureprevents
thegenerationoffrequenciesintheaudiofrequency
band,thuseliminatinganytransformernoise.
Figure 8. Oscillator Behavior Compared with
HT7L2102 and Other Green Mode PWM Controller
Frequency Jitter for EMI Restriction
EMIrestrictionisaccomplishedusingaFrequency
Jitterfunction,whichspreadstheenergyoverawider
frequencyrangethanthebandwidthmeasuredby
theEMItestequipment.AninternalFrequencyJitter
circuitchangestheswitchingfrequencybetween+4%
and-4%ofthecentralfrequencywithaperiodof
4ms.
Figure 9 Frequency Jitter Function Spreads Energy
Over a Period to Accomplish EMI Restraining



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