Design-Guide-for-Desktop-Platform-Form-Factors--In

PowerSupplyDesignGuideforDesktopPlatformFormFactorsRevision1.1March20072INFORMATIONINTHISDOCUMENTISPROVIDEDINCONNECTIONWITHINTEL®PRODUCTS.NOLICENSE,EXPRESSORIMPLIED,BYESTOPPELOROTHERWISE,TOANYINTELLECTUALPROPERTYRIGHTSISGRANTEDBYTHISDOCUMENT.EXCEPTASPROVIDEDININTEL'STERMSANDCONDITIONSOFSALEFORSUCHPRODUCTS,INTELASSUMESNOLIABILITYWHATSOEVER,ANDINTELDISCLAIMSANYEXPRESSORIMPLIEDWARRANTY,RELATINGTOSALEAND/ORUSEOFINTELPRODUCTSINCLUDINGLIABILITYORWARRANTIESRELATINGTOFITNESSFORAPARTICULARPURPOSE,MERCHANTABILITY,ORINFRINGEMENTOFANYPATENT,COPYRIGHTOROTHERINTELLECTUALPROPERTYRIGHT.Intelproductsarenotintendedforuseinmedical,lifesaving,orlifesustainingapplications.Intelmaymakechangestospecificationsandproductdescriptionsatanytime,withoutnotice.Designersmustnotrelyontheabsenceorcharacteristicsofanyfeaturesorinstructionsmarked“reserved”or“undefined.”Intelreservestheseforfuturedefinitionandshallhavenoresponsibilitywhatsoeverforconflictsorincompatibilitiesarisingfromfuturechangestothem.Thisdocumentcontainsinformationonproductsinthedesignphaseofdevelopment.Donotfinalizeadesignwiththisinformation.Revisedinformationwillbepublishedwhentheproductisavailable.Verifywithyourlocalsalesofficethatyouhavethelatestdatasheetbeforefinalizingadesign.ContactyourlocalIntelsalesofficeoryourdistributortoobtainthelatestspecificationsandbeforeplacingyourproductorder.Hyper-ThreadingTechnologyrequiresacomputersystemwithanIntel®Pentium®4processorsupportingHTTechnologyandaHyper-ThreadingTechnologyenabledchipset,BIOSandoperatingsystem.Performancewillvarydependingonthespecifichardwareandsoftwareyouuse.See*Othernamesandbrandsmaybeclaimedasthepropertyofothers.Copyright©2007,IntelCorporation.*Othernamesandbrandsmaybeclaimedasthepropertyofothers.3Contents1Introduction............................................................................................................111.1ReferenceDocumentation...................................................................................111.2Terminology.....................................................................................................122PlatformConfigurations...........................................................................................152.1DigitalHomeandDigitalOfficePlatformConfigurations-RECOMMENDED.................153Electrical.................................................................................................................213.1ACInput-REQUIRED........................................................................................213.1.1InputOverCurrentProtection-REQUIRED................................................213.1.2InrushCurrent-REQUIRED.....................................................................213.1.3InputUnderVoltage-REQUIRED.............................................................213.2DCOutput-REQUIRED......................................................................................223.2.1DCVoltageRegulation............................................................................223.2.2OutputTransientResponse-REQUIRED....................................................223.2.3RemoteSensing-REQUIRED...................................................................233.2.4OtherLowPowerSystemRequirements-RECOMMENDED...........................233.2.5OutputRippleNoise-REQUIRED..............................................................233.2.6CapacitiveLoad-REQUIRED....................................................................243.2.7ClosedLoopStability-REQUIRED............................................................243.2.8+5VDC/+3.3VDCPowerSequencing-REQUIRED...................................243.2.9VoltageHold-upTime-REQUIRED...........................................................253.3Timing,HousekeepingandControl-REQUIRED.....................................................253.3.1PWR_OK...............................................................................................253.3.2Power-upCrossLoadingCondition............................................................263.3.3PS_ON#................................................................................................263.3.4+5VSB.................................................................................................273.3.5Power-onTime.......................................................................................273.3.6RiseTime..............................................................................................273.3.7OvershootatTurn-on/Turn-off...............................................................283.4ResetafterShutdown........................................................................................283.4.1+5VSBatPower-down.....................................