HT7L2103 datasheet(5/11 Pages) HOLTEK

Part #	HT7L2103

Description	Anti-EMI, High Efficiency Dimmable LED Lighting Driver with Primary-Side Constant Control and Green Mode

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Manufacturer	HOLTEK [Holtek Semiconductor Inc]

Direct Link	http://www.holtek.com

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5 / 11 page

Rev. 1.00

5

November 04, 2011

HT7L2103

Application Information

Operation Overview

TheHT7L2013isahighlyfunctionallyintegrated

PWMcontrollerforLEDlightingandisoptimizedto

restrictEMI.Thedeviceusesaprimarysidefeedback

designwithconstantcurrentcontroltoreduceexternal

componentrequirementsandtomaintaincurrent

accuracy.ItisrecommendedforE27retrofitlamp

use.ThePWMdimmingrangeis1%to99%and

provideslessthan1%dimmingprecision.Itsinternal

featuresincludeGreenmode(Non-Acoustic-Noise),

internalslopecompensation,highefficiencyunder

differentloadconditionswithinawideoperating

temperaturerangeof-40°Cto85°C.Thedevices

alsoincludesarangeofprotectionfunctions,SCP,

OVP,UVLO,currentlimit,LEB,softstart,OTPfor

internalthermalsensing,notonlyenhancesystem

excellentperformance,butalsoensurehighstability

ofthewholecircuitapplicationevenunderextreme

environmentalconditionssuchashightemperatureor

highEMIlevels.

Advanced Precision Oscillator for

Green-Mode Switching and Non-Acoustic

Noise Requirement

ATrimmed Precision Green Mode Oscillator is

implementedinthedevicetoenhancetheconversion

efficiencyunderlightloadconditions.AsFigure7

shows,theefficiencydifferencebetweenlightloads

andheavyloadsislessthan1%,whiletheaverage

efficiencyisonly89.5%,thepeakefficiencyis90%.

Figure 7 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’sHT7L2103

patentedGreenModeOscillatordesignedusingan

advancedNon-AcousticNoisestructureprevents

thegenerationoffrequenciesintheaudiofrequency

band,thuseliminatinganytransformernoise.

Figure 8. Oscillator Behavior Compared with

HT7L2103 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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HT7L2103 Datasheet(PDF) 5 Page - Holtek Semiconductor Inc

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