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1、,ATX12V,Power Supply Design Guide,Version 2.0,*,ATX12V Power Supply Design GuideVersion 2.0,IMPORTANT INFORMATION AND DISCLAIMERS,INTEL CORPORATION(AND ANY CONTRIBUTOR)IS PROVIDING THIS INFORMATION AS ACONVENIENCE AND ACCORDINGLY MAKES NO WARRANTIES WITH REGARD TO THISDOCUMENT OR PRODUCTS MADE IN CO
2、NFORMANCE WITH THIS DOCUMENT.,THIS DOCUMENT IS PROVIDED AS IS AND INTEL DISCLAIMS ALL EXPRESS AND IMPLIEDWARRANTIES,INCLUDING THE WARRANTY OF MERCHANTABILITY AND FITNESS FORPARTICULAR PURPOSE.IN ADDITION,INTEL(AND ANY CONTRIBUTOR)DOES NOT WARRANTOR REPRESENT THAT THIS DOCUMENT OR ANY PRODUCTS MADE I
3、N CONFORMANCE WITH ITWILL OPERATE IN THE INTENDED MANNER,ARE FREE FROM ERRORS OR DEFECTS,OR ARESAFE FOR USE FOR ITS INTENDED PURPOSE.ANY PERSON USING THIS DOCUMENT ORMAKING,USING,OR SELLING PRODUCTS IN CONFORMANCE WITH THIS DOCUMENT DOES SOAT HIS OR HER OWN RISK.,INTEL DISCLAIMS ALL LIABILITY ARISIN
4、G FROM OR RELATED TO USE OR IMPLEMENTATION OFTHE INFORMATION PROVIDED IN THIS DOCUMENT,INCLUDING LIABILITY FOR INFRINGEMENTOF ANY INTELLECTUAL PROPERTY RIGHTS RELATING TO THE INFORMATION OR THEIMPLEMENTATION OF INFORMATION IN THIS DOCUMENT.INTEL DOES NOT WARRANT ORREPRESENT THAT SUCH DEVICES OR IMPL
5、EMENTATION WILL NOT INFRINGE SUCH RIGHTS.INTEL IS NOT OBLIGATED TO PROVIDE ANY SUPPORT,INSTALLATION OR OTHER ASSISTANCEWITH REGARD TO THE INFORMATION OR PRODUCTS MADE IN ACCORDANCE WITH IT.THEINFORMATION IN THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE.THE INFORMATION REFERRED TO IN THIS DOCUMEN
6、T IS INTENDED FOR STANDARDCOMMERCIAL USE ONLY.CUSTOMERS ARE SOLELY RESPONSIBLE FOR ASSESSING THESUITABILITY OF THE INFORMATION FOR USE IN PARTICULAR APPLICATIONS.THEINFORMATION IS NOT INTENDED FOR USE IN CRITICAL CONTROL OR SAFETY SYSTEMS,MEDICAL OR LIFE SAVING APPLICATIONS,OR IN NUCLEAR FACILITY AP
7、PLICATIONS.NO LICENSE,EXPRESS OR IMPLIED,BY ESTOPPEL OR OTHERWISE,TO ANY INTELLECTUALPROPERTY RIGHTS IS GRANTED HEREIN.,Intel and Pentium are registered trademarks of Intel Corporation or its subsidiaries in the United Statesand other countries.,Copyright 2003-2004 Intel Corporation.All rights reser
8、ved.,Other names and brands may be claimed as the property of others,2,ATX12V Power Supply Design Guide,Version 2.0,Contents,1.Introduction.6,1.1.Scope.61.2.Key Changes for ATX12V Version 2.0 as Compared with ATX Power Supply.61.2.1.Increased+12 VDC output capability.61.2.2.Minimum Efficiency.61.2.3
9、.Main Power Connector:.71.2.4.Separate current limit for 12V2 on the 2x2 connector:.71.3 Terminology.7,2.Applicable Documents.83.Electrical.9,3.1.AC Input.93.1.1.Input Over-current Protection.93.1.2.Inrush Current Limiting.93.1.3.Input Under-voltage.103.1.4.Regulatory.103.1.5.Catastrophic Failure Pr
10、otection.113.2.DC Output.113.2.1.DC Voltage Regulation.113.2.2.Remote Sensing.123.2.3.Typical Power Distribution.123.2.4.Power Limit/Hazardous Energy Levels.173.2.5.Efficiency.173.2.6.Output Ripple/Noise.193.2.7.Output Transient Response.213.2.8.Capacitive Load.213.2.9.Closed-loop Stability.223.2.10
11、.+5 VDC/+3.3 VDC Power Sequencing.223.2.11.Voltage Hold-up Time.223.3.Timing/Housekeeping/Control.223.3.1.PWR_OK.233.3.2.PS_ON#.233.3.3.+5 VSB.243.3.4.Power-on Time.253.3.5.Risetime.253.3.6.Overshoot at Turn-on/Turn-off.253.3.7.Reset after Shutdown.253.3.8.+5 VSB at AC Power-down.253.4.Output Protec
12、tion.263.4.1.Over-voltage Protection.263.4.2.Short-circuit Protection.26,3,3.4.3.,3.4.4.,3.4.5.,3.4.6.,4.1.,4.2.,4.3.,4.4.,4.5.,5.1.,5.2.,5.3.,5.4.,5.5.,5.6.,5.7.,ATX12V Power Supply Design Guide,Version 2.0,No-load Operation.26Over-current Protection.26Over-temperature Protection.27Output Bypass.27
13、,4.Mechanical.28,Labeling/Marking.28Physical Dimensions.28Airflow/Fan.31AC Connector.32DC Connectors.324.5.1.ATX Main Power Connector.344.5.2.+12 V Power Connector.354.5.3.Peripheral Connector(s).354.5.4.Serial ATA Power Connector.364.5.5.Floppy Drive Connector.36,5.Environmental.37,Temperature.37Th
14、ermal Shock(Shipping).37Humidity.37Altitude.37Mechanical Shock.38Random Vibration.38Acoustics.38,6.Electromagnetic Compatibility.39,6.1.Emissions.396.2.Immunity.396.3.Input Line Current Harmonic Content and Line Flicker.406.4.Magnetic Leakage Fields.40,7.Reliability.41,7.1.Component De-rating.41,8.S
15、afety.42,8.1.North America.428.2.International.438.3.Proscribed Materials.43,4,ATX12V Power Supply Design Guide,Version 2.0,Figures,Figure 1.Cross Loading Graph for 250W Configuration.13Figure 2.Cross Loading Graph for 300W Configuration.14Figure 3.Cross Loading Graph for 350W Configuration.15Figure
16、 4.Cross Loading Graph for 400W Configuration.16Figure 5.Differential Noise Test Setup.20Figure 6.Power Supply Timing.22Figure 7.PS_ON#Signal Characteristics.24Figure 8.Power Supply Dimensions for Chassis That Does Not Require Top Venting.29Figure 9.Power Supply Dimensions for Chassis That Require T
17、op Venting.30Figure 10.ATX12V Power Supply Connectors.33Figure 11.Serial ATA Connector.36,Tables,Table 1.AC Input Line Requirements.9Table 2.DC Output Voltage Regulation.11Table 3.Typical Power Distribution for a 250 W ATX12V Configuration.13Table 4.Typical Power Distribution for a 300 W ATX12V Conf
18、iguration.14Table 5.Typical Power Distribution for a 350 W ATX12V Configuration.15Table 6.Typical Power Distribution for a 400 W ATX12V Configuration.16Table 7.Minimum Efficiency Vs Load.17Table 8.Loading Table for Efficiency Measurements.18Table 9.Energy Star Input Power Consumption.19Table 10.DC O
19、utput Noise/Ripple.20Table 11.DC Output Transient Step Sizes.21Table 12.Output Capacitive Loads.21Table 13.PWR_OK Signal Characteristics.23Table 14.PS_ON#Signal Characteristics.24Table 15.Overvoltage Protection.26Table 16.Harmonic Limits,Class D Equipment.40,5,ATX12V Power Supply Design Guide,Versio
20、n 2.0,1.Introduction,1.1.Scope,This document provides design suggestions and reference specifications for a family of,power supplies that comply with the ATX Specification,Version 2.03 for motherboards,and chassis.It includes supplementary information not expressly detailed in the ATXSpecification,s
21、uch as information about the physical form factor of the power supply,cooling requirements,connector configuration,and pertinent electrical and signal timingspecifications.,This document is provided as a convenience only and is not intended to replace the usersindependent design and validation activ
22、ity.It should not be inferred that all ATX12Vpower supplies must conform exactly to the content of this document.The design specificsdescribed herein are not intended to support all possible system configurations.Systempower supply needs vary widely depending on factors such as the application(that
23、is,fordesktop,workstation,or server),intended ambient environment(temperature,line voltage),or motherboard power requirements.,1.2.Key Changes for ATX12V Version 2.0 as Compared withATX Power Supply,This section briefly summarizes the major changes made to this document that now definesATX12V power
24、supply.With the move to 12V voltage regulators for the processor,ATXguidelines for 5V as main power are no longer provided.,1.2.1.Increased+12 VDC output capability,System components that use 12V are continuing to increase in power.In cases whereexpected current requirements is greater than 18A a se
25、cond 12 V rail should be madeavailable.ATX12V power supplies should be designed to accommodate these increased+12 VDC currents.,1.2.2.Minimum Efficiency,Minimum measured efficiency is required to be 70%at full and typical(50%)load and60%at light(20%)load.New recommended guidance has been added to pr
26、ovide directionfor future requirements.,2.03 is the current version of the ATX Specification as of this writing.Future references to the ATX,Specification in this document imply version 2.03 or later,as applicable.,6,BA,Noise,ATX12V Power Supply Design GuideVersion 2.01.2.3.Main Power Connector:The
27、2 x 10 main power connector has been replaced by a 2 x 12 connector.This was made tosupport 75 watt PCI Express*requirements.Pinout assignments are based on the SSIrecommendation.With the added 12V,5V,and 3.3V pins the need for an Aux Power connector is no longerneeded and the guidance for this conn
28、ector has been removed.1.2.4.Separate current limit for 12V2 on the 2x2 connector:The 12V rail on the 2 x 2 power connector should be a separate current limited output to meetthe requirements of UL and EN 60950.1.3 TerminologyThe following terms are used in this document:,TermRequiredRecommendedOpti
29、onalCFMMonotonically,DescriptionThe status given to items within this design guide,which are required to meetdesign guide and a large majority of system applications.The status given to items within this design guide,which are not required tomeet design guide,however,are required by many system appl
30、ications.The status given to items within this design guide,which are not required tomeet design guide,however,some system applications may optionally use thesefeatures.Declared sound power,LwAd.The declared sound power level shall bemeasured according to ISO*7779 for the power supply and reported a
31、ccordingto ISO 9296.Cubic Feet per Minute(airflow).A waveform changes from one level to another in a steady fashion,withoutintermediate retracement or oscillation.The periodic or random signals over frequency band of 0 Hz to 20 MHz.,7,ATX12V Power Supply Design GuideVersion 2.02.Applicable Documents
32、The following documents support this design guide as additional reference material.,8,Document TitleFCC Rules Part 15,Class BICES-003:1997,Class BEN 55022:1998+Amendment A1:2000 Class BCISPR 22:1997,Class BAS/NZS 3548:1995,Class BEN 55024:1998rdIEC 60950,3 ed.,1999EN 60950:2000rdUL 60950,3 ed.,2000C
33、SA 22.2 No.60950-00,DescriptionTitle 47,Code of Federal Regulations,Part 15Interference-Causing Equipment Standard Digital ApparatusInformation Technology Equipment Radio disturbance characteristics Limitsand methods of measurementInformation Technology Equipment Radio disturbance characteristics Li
34、mitsand methods of measurementInformation Technology Equipment Radio disturbance characteristics Limitsand methods of measurementInformation Technology Equipment Immunity Characteristics Limits andmethods of measurementSafety of Information Technology EquipmentSafety of Information Technology Equipm
35、entSafety of Information Technology EquipmentSafety of Information Technology Equipment,ATX12V Power Supply Design GuideVersion 2.03.ElectricalThe electrical requirements that follow are to be met over the environmental rangesspecified in Section 5 unless otherwise noted.3.1.AC InputTable 1 lists AC
36、 input voltage and frequency requirements for continuous operation.Thepower supply shall be capable of supplying full-rated output power over two input voltageranges rated 100-127 VAC and 200-240 VAC RMS nominal.The correct input range foruse in a given environment may be either switch-selectable or
37、 auto-ranging.The powersupply shall automatically recover from AC power loss.The power supply must be able tostart up under peak loading at 90 VAC.Table 1.AC Input Line Requirements,ParameterVin(115 VAC)V in(230 VAC)V in Frequency,Minimum9018047,Nominal+115230-,Maximum13526563,UnitVAC rmsVAC rmsHz,+
38、Note:Nominal voltages for test purposes are considered to be within 1.0 V of nominal.3.1.1.Input Over-current ProtectionThe power supply shall incorporate primary fusing for input over-current protection toprevent damage to the power supply and meet product safety requirements.Fuses shouldbe slow-bl
39、owtype or equivalent to prevent nuisance trips.3.1.2.Inrush Current LimitingMaximum inrush current from power-on(with power on at any point on the AC sine)andincluding,but not limited to,three line cycles,shall be limited to a level below the surgerating of the input line cord,AC switch if present,b
40、ridge rectifier,fuse,and EMI filtercomponents.Repetitive ON/OFF cycling of the AC input voltage should not damage thepower supply or cause the input fuse to blow.For Denmark and Switzerland international safety requirements,if the internal over-current protectivedevices exceed 8A for Denmark and 10A
41、 for Switzerland,then the power supply must pass internationalsafety testing to EN 60950 using a maximum 16A over-current protected branch circuit,and this 16A(timedelay fuse)branch circuit protector must not open during power supply abnormal operation(output shortcircuit and component fault)testing
42、.9,ATX12V Power Supply Design Guide,Version 2.0,3.1.3.Input Under-voltage,The power supply shall contain protection circuitry such that the application of an inputvoltage below the minimum specified in Section 3.1,Table 1,shall not cause damage to thepower supply.,3.1.4.Regulatory,The power supply i
43、s required to be tested and comply with the most current versionof the following regulatory specification requirements and/or standards,PRODUCT SAFETY,UL*60950,3rd Edition CAN/CSA-C22.2-60950-00,EN*60 950,3rd Edition,IEC*60 950,3rd Edition(CB Report to include all national deviations),EU*Low Voltage
44、 Directive(73/23/EEC)(CE Compliance)GB4943-90 CCIB*(China),ELECTROMAGNETIC CAMPATIBILITY,FCC*,Class B,Part 15(Radiated&Conducted Emissions),CISPR*22/EN55022,3 rd Edition(Radiated&Conducted Emissions)EN55024(ITE Specific Immunity),EN 61000-4-2 Electrostatic DischargeEN 61000-4-3 Radiated RFI Immunity
45、EN 61000-4-4 Electrical Fast Transients.EN 61000-4-5 Electrical SurgeEN 61000-4-6 RF Conducted,EN 61000-4-8 Power Frequency Magnetic Fields,EN 61000-4-11 Voltage Dips,Short Interrupts and FluctuationsEN61000-3-2(Harmonics),EN61000-3-3(Voltage Flicker),EU EMC Directive(8/9/336/EEC)(CE Compliance),Oth
46、er Certifications and/or Declarations,GB925(China/CCC*),CNS13438(Taiwan/BSMI*),AS/NZ3548(Australia/C-tick*based on CISPR22),10,(1),(2),ATX12V Power Supply Design GuideVersion 2.03.1.5.Catastrophic Failure ProtectionShould a component failure occur,the power supply should not exhibit any of thefollow
47、ing:Flame Excessive smoke Charred PCB Fused PCB conductor Startling noise Emission of molten material3.2.DC Output3.2.1.DC Voltage RegulationThe DC output voltages shall remain within the regulation ranges shown in Table 2 whenmeasured at the load end of the output connectors under all line,load,and
48、 environmentalconditions.The voltage regulation limits shall be maintained under continuous operationfor any steady state temperature and operating conditions specified in Section 5.Table 2.DC Output Voltage Regulation,Output+12V1DC,Range5%,Min.+11.40,Nom.+12.00,Max.+12.60,UnitVolts,+12V2DC+5VDC+3.3
49、VDC,(1)(2),5%5%5%,+11.40+4.75+3.14,+12.00+5.00+3.30,+12.60+5.25+3.47,VoltsVoltsVolts,-12VDC+5VSB,10%5%,-10.80+4.75,-12.00+5.00,-13.20+5.25,VoltsVolts,At+12 VDC peak loading,regulation at the+12 VDC output can go to 10%.Voltage tolerance is required at main connector and S-ATA connector(if used).11,A
50、TX12V Power Supply Design Guide,Version 2.0,3.2.2.Remote Sensing,The+3.3 VDC output should have provisions for remote sensing to compensate forexcessive cable drops.The default sense should be connected to pin 11 of the main powerconnector.The power supply should draw no more than 10 mA through the
