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