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HT7A3942 Datasheet(PDF) 5 Page - Holtek Semiconductor Inc

Part # HT7A3942
Description  High Performance Current Mode PWM Controller
Download  11 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT7A3942 Datasheet(HTML) 5 Page - Holtek Semiconductor Inc

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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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