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HT7A3942 Datasheet(PDF) 5 Page - Holtek Semiconductor Inc |
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HT7A3942 Datasheet(HTML) 5 Page - Holtek Semiconductor Inc |
5 / 11 page Rev. 1.00 5 May 27, 2011 HT7A3942 Application Information Operation Overview TheHT7A3942isanexcellent,lowpoweroff-line PWMController.Withahighdegreeoffunctional integration,theexternalcomponentrequirementis greatlyreducedresultinginexcellentperformance/ costratios.Thedeviceintegratesmanyenhanced featuressuchasaNon-Acoustic-NoiseGreenMode Oscillator,InternalSlopeCompensation,Internal Leading-EdgeBlanking,Short-CircuitProtection andawideindustrialoperatingtemperaturerange (-40°Cto85°C).Thedeviceisdesignedforprimary sidecontrol/secondarysidefeedbackapplications andisoptimizedfortheEnergy-Star2.0specification, thisensuresthatanyEPS(ExternalPowerSupply) implementedusingtheHT7A3942canfullysatisfy theEnergyStar1.1/2.0Stand-by(No-Load)criteria. Energy Consumption Criteria for No-Load Nameplate Output Power (Pno) Maximum Power in No-Load AC-AC EPS AC-DC EPS 0 to < 50 watts ≤ 0.5 watts ≤ 0.3 watts ≥ 50 to ≤ 250 watts ≤ 0.5 watts ≤ 0.3 watts Table 1. Energy Star 2.0 No-Load Criteria Ultra Low Stand-by Power for Energy Star 2.0 and Later Energy Star Requirement Thedevicecontainsmanyadvancedcontrolschemes forLowStand-byPowerliketinyOperating/Stand- byCurrent,GreenModeforLight-Load,etc.By choosinganappropriateStand-byresistor(asshown inFigure7),EPSimplementedbythedevicecanfully satisfytheEnergyStar2.0No-Loadcriteria. Figure 7. Stand-by Resistor Baseondevicefieldtestdemoboardresults,forthe Full-Range(115V,230VVac)input,theStand-by Powerwillremainlessthan0.3W@Pno=60W(as showninTable2).ThisiswithintheEnergyStar2.0 criteria. Input Range Stand-by Power Demo Board Input Condition (Pno=60 watts) 115V VAC < 0.3W 230V VAC < 0.3W Table 2. Demo Board Stand-by Power Results Advanced Precise-Oscillator for Green- Mode Switching and Non-Acoustic Noise Requirement A Trimmed Precise Green Mode Oscillator is implementedinthedevicetoenhancetheconversion efficiencyunderconditionsoflightloads.Asthe datashowninFig.8,theefficiencydifferenceofthe traditionalcurrentmodePWMControllerbetween lightloadsandheavyloadsismorethan8%,while theaverageefficiencyisonly82%,theefficiency difference of the HT7A3942 is only 1%, while averageefficiencyisupto87.5%. Figure 8. Efficiency Comparison between HT7A3942 & Traditional Current Mode PWM Controller (Measured at HT7A3942 Demo Board) |
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