Intel ATX 0.9 User's Manual
Contents
1. International The vendor must provide a complete CB certificate and test report to IEC 950 2 edition Al A2 and A4 The CB report must include ALL CB member country national deviations CB report must include evaluation to EN60 950 Al A2 A4 and EMKO TSE 74 SEC 207 94 evaluations and certifications must be for reinforced insulation between primary and secondary circuits It is highly recommended that the CB report be issued by NEMKO Proscribed Materials Cadmium should not be used in painting or plating No quaternary salt electrolytic capacitors shall be used Page 312. The maximum short circuit energy in any output shall not exceed 240 VA 3 5 3 No Load Operation No damage or hazardous condition should occur with all the DC output connectors disconnected from the load The power supply may latch into the shutdown state 3 5 4 Overcurrent Protection Overload currents applied to each tested output rail will cause the output to trip before reaching or exceeding 240 VA For testing purposes the overload currents should be ramped at a minimum rate of 10 A s starting from full load 3 5 5 Output Bypass The output return may be connected to the power supply chassis The return will be connected to the system chassis by the system components Page 19 Intel ATX Power Supply Design Guide Version 0 9 4 Mechanical Requirements 4 1 Labeling Marking Each supply shall be marked with the following at minimum e Access warning text Do not remove this cover Trained service personnel only No user serviceable components inside in English German Spanish French Chinese and Japanese with universal warning markings e Manufacturer information manufacturer s name part number and lot date code in human readable text format etc e Nominal AC input operating voltages 100 127 VAC and 200 240 V AC and current rating certified by all agencies specified in Section 8 e DC output voltages and current ratings 4 2 Physical Dimensions The supply shall be enclosed and meet the physical outline s
3. Typical Power Distribution Although power requirements and distributions will depend on the specific system options and implementation this section identifies several potential configurations For a single processor mini tower configuration with one ISA slot three PCI slots one shared slot and six peripheral bays a minimum 160 W sustained 200 W peak power supply should be sufficient for a typical application For a full tower dual processor configuration with one ISA slot five PCI slots one shared slot and six peripheral bays a 300 W sustained power supply should be sufficient Tables 4 5 6 and 7 list the suggested power distribution for various configurations and applications Table 4 Typical Power Distribution for a 160 W Configuration Min Max Peak Current Current Current Output amps amps amps Notes 12VDC 0 0 6 0 8 0 5VDC 1 0 18 0 3 3VDC and 5VDC combined power 110 W max 3 3VDC 0 3 14 0 Pin 11 default 3 3 V sense required 5VDC 0 0 0 3 12VDC 0 0 0 8 5VSB 0 0 0 72 See Section 3 4 3 Current Current Current Output amps amps amps Notes 12VDC 0 0 6 0 8 0 5VDC 1 0 21 0 3 3VDC and 5VDC combined power 125 W Max 3 3VDC 0 3 14 0 Pin 11 default 3 3 V sense required 5VDC 0 0 0 3 12VDC 0 0 0 8 5VSB 0 0 0 72 See Section 3 4 3 Page 12 Intel ATX Power Supply Design Guide Version 0 9 Table 6 Typical Power Distribution for a 250 W Configuration Min Max Peak Notes Current
4. VA output and abnormal testing to include stalled fan tests and voltage select switch mismatch e The enclosure must meet fire enclosure mechanical test requirements per clauses 2 9 1 and 4 2 of UL 1950 3 edition The supplier must supply the complete certification report including a test record Production hipot testing must be included as a part of the certification and indicated as such in the certification report There must not be unusual or difficult conditions of acceptability such as mandatory additional cooling or power derating The insulation system shall not have temperatures exceeding their rating when tested in the end product The certification mark shall be marked on each power supply A list of the minimum temperature ratings of all AC mains connected components and the printed wiring board s shall be provided The power supply must be evaluated for operator accessible secondary outputs reinforced insulation that meet the requirements for SELV and do not exceed 240 VA under any condition of loading The proper polarity between the AC input receptacle and any printed wiring boards connections must be maintained i e brown line blue neutral green earth chassis Failure of any single component in the fan speed control circuit shall not cause the internal component temperatures to exceed the abnormal fault condition temperatures per IEC 950 Page 30 8 2 8 3 Intel ATX Power Supply Design Guide Version 0 9
5. cooling for the power supply and all integrated chassis components It is suggested that an 80 mm ball bearing fan be used in conjunction with a thermally sensitive fan speed control circuit to balance system level thermal and acoustic performance The thermal fan speed control typically should sense the temperature of the secondary heatsink and or incoming ambient air and adjust the fan speed as necessary to keep power supply and system component temperatures within specification Both the power supply and system designer should be aware of the dependencies of the system and power supply temperatures on the control circuit response curve and fan size and specify them accordingly The intake and exhaust grills of the power supply should remain suitably free of obstruction so as not to hinder airflow or generate excessive acoustic noise i e no objects within 0 5 inches of the intake or exhaust areas The opening must be sufficiently protected to meet the safety requirements described in Section 8 For the grill pattern area relevant to a given chassis design see Figures 2 and 3 A flush mount wire fan grill can be used instead of a stamped metal grill to maximize airflow and minimize acoustic noise 4 4 AC Connector The AC input receptacle should be an IEC 320 type or equivalent In lieu of an additional switch the IEC 320 receptacle may be considered the mains disconnect 4 5 DC Connectors Figure 4 shows pinouts and profiles for typical A
6. hr 5 2 Thermal Shock Shipping Nonoperating 40 C to 70 C 15 C min lt dT dt lt 30 C min 50 cycles Duration of exposure to temperature extremes for each half cycle shall be 30 minutes 5 3 Humidity Operating To 85 relative humidity noncondensing Nonoperating To 95 relative humidity noncondensing Note 9596 RH is achieved with a dry bulb temperature of 55 and a wet bulb temperature of 54 5 4 Altitude Operating To 10 000 ft Nonoperating To 50 000 ft 5 5 Mechanical Shock Nonoperating 50 g trapezoidal input velocity change 2 170 in s Three drops on each of six faces are applied to each sample Page 26 Intel ATX Power Supply Design Guide Version 0 9 5 6 Random Vibration Nonoperating 0 01 g Hz at 5 Hz sloping to 0 02 g Hz at 20 Hz and maintaining 0 02 g Hz from 20 Hz to 500 Hz The area under the PSD curve is 3 13 gRMS The duration shall be 10 minutes per axis for all three axes on all samples 5 7 Acoustics Acoustic requirements will be set by the final computer OEM system level requirements Page 27 Intel ATX Power Supply Design Guide Version 0 9 6 Electromagnetic Compatibility 6 1 EMI The power supply shall comply with CISPR 22 Class B for both conducted and radiated emissions with a 4 dB margin Tests shall be conducted using a shielded DC output cable to a shielded load The load shall be adjusted as follows for three tests No load on each output 5096 loa
7. slew rate will be 2 5 A us The power supply should be stable under all transient conditions from any steady state load and the over undershoot should be within the regulation band stated in Section 3 2 1 3 3 5 Capacitive Load The power supply should be able to power up and operate normally with the following capacitances simultaneously present on the DC outputs Output 12VDC 5VDC 3 3VDC 5VDC 12VDC 5VSB Capacitive load uF 1 000 10 000 6 000 350 350 350 3 3 6 Closed Loop Stability The power supply shall be unconditionally stable under all line load transient load conditions including capacitive loads specified in Section 3 3 5 A minimum of 45 degrees phase and 10 dB gain margin is required The power supply vendor shall provide proof of the unit s closed loop stability with local sensing through the submission of Bode plots Closed loop stability must be ensured at the maximum and minimum loads as applicable Page 14 Intel ATX Power Supply Design Guide Version 0 9 3 3 7 5VDC 3 3VDC Power Sequencing The 5VDC output level must be equal to or greater than the 3 3VDC output at all times during power up and normal operation The time between the 5VDC output reaching its minimum in regulation level and 3 3VDC reaching its minimum in regulation level must be less than or equal to 20 ms 3 3 8 Voltage Hold up Time The power supply shall maintain output regulation per Section 3 2 1 despite a loss of input power at
8. the low end nominal range Low 115 VAC 57 Hz or 230 VAC 47 Hz at maximum continuous output load as applicable for a minimum of 17 ms Page 15 Intel ATX Power Supply Design Guide Version 0 9 3 4 Timing Housekeeping Control Off PS ON 0 22 95 45VDC 43 8VDC O P 10 LN gt 751 PWR OK iT3i y T2 Id gt 14 lt PWR Sense Level 95 of nominal Figure 1 Power Supply Timing Notes T is defined in Section 3 4 5 T5 T4 and T5 are defined in Table 9 3 4 1 PWR OK PWR OK is a power good signal It should be asserted high by the power supply to indicate that the 5VDC and 3 3VDC outputs are above the undervoltage thresholds listed in Section 3 2 1 and that sufficient mains energy is stored by the converter to guarantee continuous power operation within specification for at least the duration specified in Section 3 3 8 Conversely PWR OK should be deasserted to a low state when either the 5VDC or the 3 3VDC output voltages falls below the undervoltage threshold or when mains power has been removed for a time sufficiently long such that power supply operation cannot be guaranteed beyond the hold up time The electrical and timing characteristics of the PWR_OK signal are given in Table 9 and in Figure 1 Table 9 PWR OK Signal Characteristics Signal Type 5 V TTL compatible Logic level low 0 4 V while sinki
9. 05K MIL STD 217F MIL C 5541 CSA C22 2 No 234 Level 3 CAN CSA C22 2 No 950 95 3 edition UL 1950 without D3 Deviation 3 edition IEC 950 plus A1 A2 A3 A4 EN60 950 plus A1 A2 A3 A4 EMKO TSE 74 SEC 207 94 CISPR 22 and EN 55022 ANSI C63 4 1992 50082 1 1992 EN61000 3 2 Japan Electric Association IEC801 IEC1000 4 IEC Publication 417 ISO Standard 7000 CFR 47 Part 15 Subpart B PrEN 50082 1 1995 ENV 50140 ENV 50204 ENV 50141 EN 61000 4 11 EACEM European Association of Consumer Electronics Manufacturers Hazardous Substance List Certification IEEE Recommended Practice on Surge Voltages in Low Voltage AC Circuits IEEE Guide on Surge Testing for Equipment Connected to Low Voltage AC Power Circuits Quality Control Reliability Predictions for Electronic Equipment Chemical Conversion Coatings on Aluminum and Aluminum Alloys Safety of Component Power Supplies Intended for use with Electronic Data Processing Equipment and Office Machines Safety of Information Technology Equipment including Electrical Business Equipment Safety of Information Technology Equipment including Electrical Business Equipment Safety of Information Technology Equipment including Business Equipment Safety of Information Technology Equipment including Business Equipment Nordic National Requirement in addition to EN60950 Limits and Methods of Measurements of Radio Interference Characteristics of Info
10. 7 Reset after Shutdown sse entrent nnns nnn nnne nnns 18 2 4 8 45VSB at AC POWerDOWDh iip a emt e p e dedi e 18 3 53 OUTPUT Protections ior bet edibus tu th idt stu edere 19 3 5 1 Protection sess ener nnne nnne nennen 19 3 5 2 Short Circuit ennt entente nnne 19 2 5 9 NO Load Op ratio Niena aiite ena oe PERO SERRE de TENERA DURS 19 3 5 4 Overcurrent Protection eet Al P dette tid geben dun 19 3 5 5 OUTPUT Bypass t eto rese PEE e PE Dare d ete ER Ped aee 19 4 Mechanical Requirements 20 44 Labeling Marking eite detestabile ede eds 20 4 2 Physical Dimensions reine t Etude ieu e e 20 4 3 Allow Ears iei enu Duae Eee 23 Page 3 Intel ATX Power Supply Design Guide Version 0 9 4 4 AGO GOnDIIGCIOI eut uda 23 4 5 IDO GOornnectors d rechnen ed en P re EO 23 4 51 Main Power Connector sssssssssssssseeeee eene nnne nennen nnne nnne nns 24 4 5 2 Auxiliary Power Connector for 250 W and 300 W Configurations 25 4 5 9 Peripheral 5 eot tee tere e 25 4 5 4 Floppy Drive nnne nennen snnt nennen 25 5 Environmental Requir
11. Current Current Requires the 1x6 auxiliary power connector to carry Output amps amps amps the 3 3 V amp 5 V currents to the PCB 12VDC 0 0 10 0 12 0 5VDC 1 0 25 0 3 3VDC and 5VDC combined power 145 W Max 3 3VDC 0 3 16 0 Pin 11 default 3 3 V sense required 5VDC 0 0 0 3 12VDC 0 0 0 8 5VSB 0 0 0 72 See Section 3 4 3 Min Max Peak Notes Current Current Current Requires the 1x6 auxiliary power connector to carry Output amps amps amps the 3 3 V amp 5 V currents to the PCB 12VDC 0 0 10 0 12 0 5VDC 1 0 30 0 3 3VDC and 5VDC combined power 220 W Max 3 3VDC 0 3 28 0 Pin 11 default 3 3 V sense required 5VDC 0 0 0 3 12VDC 0 0 0 8 5VSB 0 0 0 72 See Section 3 4 3 3 3 1 Power Limit Under short circuit or overload conditions no output shall exceed 240 VA under any conditions including single component fault conditions 3 3 2 Efficiency The efficiency of the power supply should be met over the AC input range defined in Table 1 under the load conditions defined in Section 3 3 and under the temperature and operating conditions defined in Section 5 The power supply should be a minimum of 68 efficient under maximum load as defined in the applicable configuration The Energy Star efficiency of the power supply should be a minimum of 56 In the Energy Star state the AC input power is limited to 15 of rated output power for the configuration For example in a 200 W configuration the Energy Star
12. Intel ATX Power Supply Design Guide Version 0 9 Intel ATX Power Supply Design Guide Version 0 9 IMPORTANT INFORMATION AND DISCLAIMERS 1 INTEL CORPORATION AND ANY CONTRIBUTOR MAKES WARRANTIES WITH REGARD TO THIS DOCUMENT AND IN PARTICULAR DOES NOT WARRANT OR REPRESENT THAT THIS DOCUMENT OR ANY PRODUCTS MADE IN CONFORMANCE WITH IT WILL WORK IN THE INTENDED MANNER NOR DOES INTEL OR ANY CONTRIBUTOR ASSUME RESPONSIBILITY FOR ANY ERRORS THAT THE DOCUMENT MAY CONTAIN OR HAVE ANY LIABILITIES OR OBLIGATIONS FOR DAMAGES INCLUDING BUT NOT LIMITED TO SPECIAL INCIDENTAL INDIRECT PUNITIVE OR CONSEQUENTIAL DAMAGES WHETHER ARISING FROM OR IN CONNECTION WITH THE USE OF THIS DOCUMENT IN ANY WAY 2 NO REPRESENTATIONS OR WARRANTIES ARE MADE THAT ANY PRODUCT BASED IN WHOLE OR IN PART ON THE ABOVE DOCUMENT WILL BE FREE FROM DEFECTS OR SAFE FOR USE FOR ITS INTENDED PURPOSE ANY PERSON MAKING USING OR SELLING SUCH PRODUCT DOES SO AT HIS OR HER OWN RISK 3 THE USER OF THIS DOCUMENT HEREBY EXPRESSLY ACKNOWLEDGES THAT THE DOCUMENT IS PROVIDED AS IS AND THAT INTEL CORPORATION AND ANY CONTRIBUTOR MAKES NO REPRESENTATIONS EXTENDS NO WARRANTIES OF ANY KIND EITHER EXPRESS OR IMPLIED ORAL OR WRITTEN INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR WARRANTY OR REPRESENTATION THAT THE DOCUMENT OR ANY PRODUCT OR TECHNOLOGY UTILIZING THE DOCUMENT OR ANY SUBSET OF THE DOCUMENT WILL BE FREE FROM ANY CLAIMS OF INFRI
13. NGEMENT OF ANY INTELLECTUAL PROPERTY INCLUDING PATENTS COPYRIGHT AND TRADE SECRETS NOR DOES INTEL OR ANY CONTRIBUTOR ASSUME ANY OTHER RESPONSIBILITIES WHATSOEVER WITH RESPECT TO THE DOCUMENT OR SUCH PRODUCTS 4 COPYRIGHT LICENSE IS HEREBY GRANTED TO REPRODUCE THIS DOCUMENT FOR ANY PURPOSE PROVIDED THIS IMPORTANT INFORMATION AND DISCLAIMERS SECTION PARAGRAPHS 1 4 IS PROVIDED IN WHOLE NO OTHER LICENSE EXPRESS OR IMPLIED BY ESTOPPEL OR OTHERWISE TO ANY OTHER INTELLECTUAL PROPERTY RIGHTS IS GRANTED HEREIN Copyright 1998 Intel Corporation All rights reserved Version 0 9 September 1998 t Third party brands and names are the property of their respective owners Revision History 0 9 Initial Release Page 2 Intel ATX Power Supply Design Guide Version 0 9 Contents hf qm 6 Applicable DOCUMEING cerent inna Ro E E XL ORT ES 7 Electrical Specification cea HU d BEER MEC Id 8 3 1 Input Requirements adria aai edade nnns entes 8 3 1 1 Input Overcurrent Protection sssssssssssseeeeeeeeen nennen enne nns 8 34 2 Gurrent uio t etn ene tiet piens 8 22153 Input Undervoltage ie e e eee ben bebes 8 3 1 4 Immunity ues encre erre ine ene EE 9 3 1 5 Catastrophic Failure Protection sss
14. Power Supply Timing ee e E ri e eh ent sh auod 16 Figure 2 Power Supply Dimensions for Chassis in Which the P S Does Not Cool Processor 21 Figure 3 Power Supply Dimensions for Chassis in Which the P S Cools the 22 Figure 4 ATX Power Supply Connectors sssssssssssssses eene nennen 24 Tables Table 1 AC Input Line Requirements essent entretenir ennt nnns 8 Table 2 AC Line Voltage Transient nennen ens 9 Table 3 DC Output Voltage 11 Table 4 Typical Power Distribution for a 160 W Configuration 2 12 Table 5 Typical Power Distribution for a 200 W Configuration 12 Table 6 Typical Power Distribution for a 250 W Configuration 2 13 Table 7 Typical Power Distribution for a 300 W Configuration 13 Table 8 DC Output 14 Table 9 PWR Signal Characteristics 16 Table 10 PS Signal Characteristics 17 Table 11 Overvoltage 19 Page 5 Intel ATX Power Supply Design Guide Version 0 9 1 Scope This document outlines a reference ATX power supply that complies with the ATX Specification Version 2 02 for motherboards and chassis It is i
15. TX power supply DC harness connectors Page 23 Intel ATX Power Supply Design Guide Version 0 9 Pin1 3 3VDC 3 3VDC COM 5VDC COM 5VDC COM PWR_OK 5VSB 12VDC 3 3VDC Pin 11 12VDC COM PS COM COM COM 5VDC 5VDC 5VDC ATX Main Power Connector Pin 1 COM COM 6 3 3VDC 3 3VDC F3 5VDC E 2 Aux Power Connector 250 W amp 300 W Systems Pin 1 12VDC Pin 4 5VDC Peripheral Power Connector Pin 1 5VDC COM L COM Pin4 DX 12vDc Floppy Drive Power Connector Figure 4 ATX Power Supply Connectors Pin side view not to scale Listed or recognized component appliance wiring material AVLV2 CN rated min 85 C 300 VDC shall be used for all output wiring There are no specific requirements for length or color of wiring from the power supply The following sections suggest wire color coding that is followed by many vendors but this color coding is NOT required 4 5 1 ATX Main Power Connector Connector MOLEX 39 01 2200 or equivalent Mating motherboard connector is Molex 39 29 9202 or equivalent 18 AWG is suggested for all wires except for the 3 3 V supply and sense return wires combined into pin 11 22 AWG For 300 W configurations 16 AWG is recommend
16. be such that should a component failure occur the power supply should not exhibit any of the following e Flame e Excessive smoke Charred PCB e Fused PCB conductor e Startling noise 3 2 DC Output Requirements 3 2 1 DC Voltage Regulation The DC output voltages shall remain within the regulation ranges shown in Table 3 when measured at the load end of the output connectors under all line load and environmental conditions The voltage regulation limits shall be maintained under continuous operation for a period of time equal to or greater than the MTBF specified in Section 7 2 at any steady state temperature and operating conditions specified in Section 5 Table 3 DC Output Voltage Regulation Output Range Min Nom Max Unit 12VDC 5 11 40 12 00 12 60 Volts 5VDC 5 4 75 5 00 5 25 Volts 3 3VDC 5 3 14 3 30 3 47 Volts 5VDC 10 4 50 5 00 5 50 Volts 12VDC 10 10 80 12 00 13 20 Volts 5VSB 5 44 75 45 00 5 25 Volts At 12 V peak loading regulation at the 12VDC output can go to 10 3 2 2 Remote Sensing The 3 3VDC output should have provisions for remote sensing to compensate for 100 mV of cable connector and PCB trace drops The default sense should be connected to pin 11 of the ATX main power connector The power supply should draw no more than 10 mA through the remote sense line to keep DC offset voltages to a minimum Page 11 Intel ATX Power Supply Design Guide Version 0 9 3 3
17. d on each output and 100 load on each output Tests will be performed at 100 VAC 50 Hz 120 VAC 60 Hz and 220 VAC 50 Hz power 6 2 Input Line Current Harmonic Content Optional If applicable to sales in Japan or Europe the power supply shall meet the requirements of EN61000 3 2 Class D and the Guidelines for the Suppression of Harmonics in Appliances and General Use Equipment Class D for harmonic line current content at full rated power 6 3 Magnetic Leakage Fields A PFC choke magnetic leakage field shall not cause any interference with a high resolution computer monitor placed next to or on top of the end use chassis Final acceptable leakage field strength will be determined by the end system vendor during system level testing in the end use chassis Page 28 Intel ATX Power Supply Design Guide Version 0 9 T Reliability 7 1 Component Derating The following component derating guidelines shall be followed e Semiconductor junction temperatures shall not exceed 110 C with an ambient of 50 Any exceptions are subject to final approval e Inductor case temperature shall not exceed safety agency requirements e Capacitor case temperature shall not exceed 95 of rated temperature e Resistor wattage derating shall be gt 30 Component voltage and current derating shall be gt 10 at 50 Any exceptions are subject to final approval e Magnetic saturation of any transformer will not be allowed under any line l
18. ed for all 5VDC 3 3VDC and COM Pin Signal 1 3 3VDC 3 3VDC COM 5VDC COM 5VDC COM PWR_OK 5VSB 0 12VDC gt ON DOO fF Color Orange Orange Black Red Black Red Black Gray Purple Yellow Pin Signal Color 11 3 3VDC Orange 11 3 3 V default Brown sense 12 12VDC Blue 13 COM Black 14 PS ON Green 15 COM Black 16 COM Black 17 COM Black 18 5VDC White 19 5VDC Red 20 5VDC Red Page 24 Intel ATX Power Supply Design Guide Version 0 9 4 5 2 Auxiliary Power Connector for 250 W and 300 W Configurations Connector Molex 90331 0010 keyed pin 6 or equivalent Pin Signal 16 AWG Wire 1 COM Black 2 COM Black 3 COM Black 4 3 3VDC Orange 5 3 3VDC Orange 6 5VDC Red 4 5 3 Peripheral Connector s Connector AMP 1 480424 0 or MOLEX 8981 04P or equivalent Contacts AMP 61314 1 or equivalent Pin Signal 18 AWG Wire 1 12VDC Yellow 2 COM Black 3 COM Black 4 5VDC Red 4 5 4 Floppy Drive Connector Connector AMP 171822 4 or equivalent Pin Signal 20 AWG Wire 1 5VDC Red 2 COM Black 3 COM Black 4 12VDC Yellow Page 25 Intel ATX Power Supply Design Guide Version 0 9 5 Environmental Requirements 5 1 Temperature Operating ambient 10 min 50 At full load with a maximum rate of change of 5 C 10 minutes but no more than 10 C hr Nonoperating ambient 40 C to 70 C Maximum rate of change of 20 C
19. ements 26 5 Temperature ere Dh is ee 26 5 2 Thermal Shock Shipping etu tata eto eben leet 26 een t p E divenuto EE 26 SA git c E 26 5 5 Mechanical Shock 26 5 6 Random Vibration it EO peine 27 5 7 ACOUSTICS 27 6 Electromagnetic Compatibility 28 sm S p 28 6 2 Input Line Current Harmonic Content 28 6 3 Magnetic Leakage Fields tei a e c Dee c ERE e 28 7 Bellabilily uiii Le MR M 29 7 1 Component Derating inttr innen 29 7 2 Mean Time Between Failures 29 8 Safety Requiremenhls cO hri sd ELI 42S SEDES FD eX RETI AD 30 8 1 North America iiid eem d pide dre bea ee Ee ee d DEL bee Done da 30 8 2 International 1 eie tipi T 31 8 3 Proscribed Materials torre E i RO UR e i GRAECE SERERE ILE 31 Page 4 Intel ATX Power Supply Design Guide Version 0 9 Figures Figure 1
20. ews must be flush mounted Bottom side not pictured may be user accessible in final system installation Cover openings as necessary to prevent access to non SELV circuitry and to meet product safety requirements 150REF yy gt 20 04 4 0X6 2X Note 5 4 94 0 ID gt x _ D zd Area on top surface inside dotted lines should 146 0 60 minimum open rea for proper venting 80 0 Eight rectangular holes for air duct mounting to direct airflow across 5 0 processor heatsink ER 4 n 45 0 vv 4 114 0 gt 138 0 86 REF ES 9 0 x 3 2 cutouts 4X See Note 4 min 5 0 clearance under cutout from inside top cover H A o 74 0 6 0 Figure 3 Power Supply Dimensions for Chassis Which the P S Cools the Processor Page 22 Intel ATX Power Supply Design Guide Version 0 9 4 3 Airflow Fan In general exhausting warm air from the chassis enclosure via a power supply fan at the rear panel is the preferred system level airflow solution Other solutions may be implemented however and some system chassis designers may reverse this airflow to meet specific system cooling requirements Ultimately the choice of fan location and direction for a power supply in an ATX system must yield acceptable
21. h of the following voltages 2 3 4 5 6 8 10 kV 15 25 Performance criteria e power supply outputs shall continue to operate within the parameters of this design guide without glitches or interruption while the supply is operating as defined and subjected to 2 kV through 15 kV ESD pulses The direct ESD event shall not cause any out of regulation conditions such as overshoot or undershoot The power system shall withstand these shocks without nuisance trips of the overvoltage protection overcurrent protection or remote 5VDC shutdown circuitry e The power supply while operating as defined shall not have a component failure when subjected to any discharge voltages up to and including 25 kV Component failure is defined as any malfunction of the power supply that causes component degradation or failure requiring component replacement to correct the problem 3 1 4 3 Radiated Immunity 3 1 4 3 1 IEC801 3 IEC 1000 4 3 Frequency Electric Field Strength 27 MHz to 500 MHz unmodulated 3 V m 3 1 4 3 2 ENV 50140 Frequency Electric Field Strength 80 to 1000 MHz 1 kHz sine wave 80 AM 3 V m 3 1 4 3 3 Radio Frequency Common Mode ENV 50141 Frequency Level 15 to 30 MHz 1 kHz sine wave 8096 AM 3V Page 10 Intel ATX Power Supply Design Guide Version 0 9 3 1 5 Catastrophic Failure Protection The primary circuit design and the components specified in the same should
22. he power supply e Disruption of the normal operation of the power supply Output voltage deviation exceeding the limits of Section 3 2 1 3 1 4 2 1 Surge Immunity IEC801 5 IEC1000 4 5 No unsafe operation is allowed under any condition No user noticeable performance degradation for 1 kV Differential Mode DM or 2 kV Common Mode CM is allowed Automatic or manual recovery is allowed for other conditions 3 1 4 2 2 Electrical Fast Transient Burst IEC801 4 IEC1000 4 4 No unsafe operation is allowed under any condition No user noticeable performance degradation up to 1 kV is allowed Automatic or manual recovery is allowed for other conditions Page 9 Intel ATX Power Supply Design Guide Version 0 9 3 1 4 2 3 Ring Wave ANSI C62 45 1992 The crest value of the first half peak of the injected oscillatory wave will be 3 0 kV open circuit with 200 and 500 A short circuit currents for the common and the normal modes of transient surge injection respectively No unsafe operation is allowed under any condition No user noticeable performance degradation for 1 kV Differential Mode DM or 2 kV Common Mode CM is allowed Automatic or manual recovery is allowed for other conditions 3 1 4 2 4 Electrostatic Discharge IEC801 2 IEC1000 4 2 In addition to IEC 801 2 IEC1000 4 2 the following ESD tests should be conducted Each surface area of the unit under test should be subjected to twenty 20 successive static discharges at eac
23. hown in either Figure 2 or 3 as applicable Page 20 Intel ATX Power Supply Design Guide Version 0 9 SIDON NA Air inlet grill 55 open area 25595055062 555505 RISS WIRE HARNESS lt 150 REF 4 0X6 2X E 2x mS x 5 50202626 XXX Optional air d 4 S inlet area 146 0 p oed SV 140 REF OXXX vv 138 0 uu 86 REF gt No 6 32 UNC 2B THREADED HOLE EH See Note 4 Notes unless otherwise A specified 1 Dimensions are in mm 2 Drawing is not to scale 640 3 Tolerances X 1 0 5 n MEM 4 If a wire grill is required for acoustics or thermals the grill and screws must 16 0 be flush mounted 6 0 2X Figure 2 Power Supply Dimensions for Chassis in Which the P S Does Not Cool Processor Page 21 Intel ATX Power Supply Design Guide Version 0 9 WS S SN WIRE HARNESS 2 11 0 x 5 0 cutouts 4X min 6 0 clearance under cutout from inside top cover 4 16 REF No 6 32 UNC 2B THREADED HOLE 4X Notes unless otherwise specified 1 Dimensions are in mm 2 Drawing is not to scale 3 Tolerances X 1 X X 0 5 If a wire grill is required for acoustics or thermals the grill and scr
24. input power limit is 200 W x 0 15 30 W In a 300 W configuration the Energy Star input power is limited to 300 W x 0 15 45 W The 5 standby supply efficiency should be 5096 at 500 mA output Standby efficiency is measured with the main outputs off and with PS_ON high The AC input power shall not exceed 5 W when the main outputs are in the DC disabled state with 500 mA load on 5VSB and the input is 230 VAC 50 Hz Page 13 Intel ATX Power Supply Design Guide Version 0 9 3 3 3 Output Ripple Noise The following output ripple noise requirements should be met throughout the load ranges specified in Section 3 3 and under all input voltage conditions as specified in Section 3 1 Ripple and noise are defined as periodic or random signals over a frequency band of 10 Hz to 20 MHz Measurements shall be made with an oscilloscope with 20 MHz bandwidth Outputs should be bypassed at the connector with a 0 1 uF ceramic disk capacitor and a 10 uF electrolytic capacitor to simulate system loading Table 8 DC Output Noise Ripple Output Ripple amp Noise MVpp 12VDC 120 5VDC 50 3 3VDC 50 5VDC 100 12VDC 120 5VSB 50 3 3 4 Output Transient Response The 3 3VDC and 5VDC outputs will see transients up to 30 of the rated output current e g for a rated 5 VDC output of 18 A the transient step would be 0 3 x 18 5 4 A The 12VDC output will see transients up to 50 of the rated output current The transient
25. ions of this voltage at or following removal of AC power Page 18 Intel ATX Power Supply Design Guide Version 0 9 3 5 Output Protection 3 5 1 Overvoltage Protection The overvoltage sense circuitry and reference shall reside in packages that are separate and distinct from the regulator control circuitry and reference No single point fault shall be able to cause a sustained overvoltage condition on any or all outputs The supply shall provide latch mode overvoltage protection as defined below Table 11 Overvoltage Protection Output Min Nom Max Unit 12VDC 15 6 Volts 5VDC 5 74 6 3 7 0 Volts 3 3VDC 3 76 4 2 4 3 Volts 3 5 2 Short Circuit Protection An output short circuit is defined as any output impedance of less than 0 1 ohms The power supply shall shut down and latch off for shorting the 3 3VDC 5 VDC or 12VDC rails to return or any other rail Shorts between main output rails and 5VSB shall not cause any damage to the power supply The power supply shall either shut down and latch off or fold back for shorting the negative rails The 5 VSB must be capable of being shorted indefinitely but when the short is removed the power supply shall recover automatically or by cycling the PS_ON The power supply shall be capable of withstanding a continuous short circuit to the output without damage or overstress to the unit components PCB traces connectors etc under the input conditions specified in Section 3 1
26. mum specified in Section 3 1 Table 1 shall not cause damage to the power supply Page 8 Intel ATX Power Supply Design Guide Version 0 9 3 1 4 Immunity 3 1 4 1 Slow Transients The DC output s shall not exceed the limits specified in Section 3 2 1 as a result of the input power line noise defined in Table 2 under any load condition per EN 61000 4 11 Table 2 AC Line Voltage Transient Limits Duration Sag Operating AC Voltage Line Performance Criteria Surge Frequency 0 to 500 ms 10 Rated AC voltages 50 60 Hz No loss of function or performance 0 to 15 1596 Mid point of rated AC 50 60 Hz No loss of function or minutes voltages performance 0 to 2 AC 30 Mid point of rated AC 50 60 Hz No loss of function or cycle voltages performance 0to5AC 50 Mid point of rated AC 50 60 Hz Loss of function acceptable cycles sag only voltages self recoverable 3 1 4 2 Surge Voltages Input Surge Withstand Capability Line Transients The power supply shall meet the 801 5 1000 4 5 Level 1 Level 2 and Level 3 criteria for surge withstand capability with the following conditions and exceptions The power supply must meet the surge withstand test for the range of operation specified in Section 3 1 The peak value of the injected unipolar wave form shall be 2 0 kV measured at the input of the power supply for the common and the normal modes of transient surge injection The surge withstand test must not produce e Damage to t
27. ng 4 mA Logic level high Between 2 4 VDC and 5 VDC output while sourcing 200 uA High state output impedance 1KQ from output to common PWR_OK delay 100 ms lt T3 lt 500 ms PWR OK rise time Ts 10 ms Power down warning T4 1 ms Page 16 Intel ATX Power Supply Design Guide Version 0 9 3 4 2 PS ON PS ON t is an active low TTL compatible signal that allows a motherboard to remotely control the power supply in conjunction with features such as soft on off wake on LAN or wake on modem When PS is pulled to TTL low the power supply should turn on the five main DC output rails 12VDC 5VDC 3 3VDC 5VDC and 12VDC When PS ON t is pulled to TTL high or open circuited the DC output rails should not deliver current and should be held at zero potential with respect to ground PS_ON has no effect on the 5VSB output which is always enabled whenever the AC power is present The power supply shall provide an internal pull up to TTL high The power supply shall also provide debounce circuitry on PS_ON to prevent it from oscillating on off at startup due to activation by a mechanical switch The DC output enable circuitry must be SELV compliant Table 10 PS Signal Characteristics Min Max Input Low Voltage 0 0 V 0 8V Input Low Current Vin 0 4 V 1 6 mA Vin Input High Voltage lin 200 pA 2 0V open circuit lin 0 5 25 V 3 4 3 5VSB 5VSB is a standby supply output that is acti
28. ntended to provide additional power supply design information not detailed in the ATX 2 02 specification including information about the physical form factor of the power supply cooling requirements connector configuration and pertinent electrical and signal timing specifications This document is provided as a convenience only and is not intended to replace or supplement the user s independent design and validation activity It should not be inferred that all ATX power supplies must conform exactly to the content of this document Neither are the design specifics described herein intended to support all possible system configurations as system power supply needs will vary widely depending on application desktop workstation server intended ambient environment temperature line voltage motherboard power requirements etc With a few modifications a standard PS 2 power supply can support an ATX form factor system At a high level these modifications include consolidating various motherboard connectors into a single 20 pin connector adding 3 3VDC and 5VSB output supply rails adding a PS ON control input and possibly repositioning the fan and or venting locations Page 6 Intel ATX Power Supply Design Guide Version 0 9 2 Applicable Documents The latest revision in effect of the following documents forms a part of this document to the extent specified AB13 94 146 ANSI C62 41 1991 ANSI C62 45 1992 MIL STD 1
29. oad startup or transient condition including 100 transients on the five main outputs or 5VSB 7 2 Mean Time Between Failures MTBF The MTBF of the power supply shall be calculated utilizing the Part Stress Analysis method of MIL HDBK 217F using the quality factors listed in MIL HDBK 217F The calculated MTBF of the power supply shall be greater than 100 000 hours under the following conditions e Full rated load e 120 VAC input e Ground benign e 25 ambient The calculated MTBF of the power supply shall be greater than 30 000 hours under the following conditions e Full rated load e 120 VAC input e Ground benign e 50 C ambient Page 29 Intel ATX Power Supply Design Guide Version 0 9 8 Safety Requirements 8 1 North America The power supply must be certified by UL or CSA for use in the USA and Canada under the following conditions e The supply must be Recognized for use in Information Technology Equipment including Electrical Business Equipment per UL 1950 3 edition without D3 deviations and CAN CSA C22 2 no 950 95 The certification must include external enclosure testing for the AC receptacle side of the power supply see Figures 2 and 3 e The supply must have a full complement of tests conducted as part of the certification such as input current leakage current hipot temperature energy discharge test transformer output characterization test open circuit voltage short circuit current and maximum
30. oltage overshoot upon the application or removal of the input voltage or the assertion deassertion of PS_ON under the conditions specified in Section 3 1 shall be less than 1096 above the nominal voltage There must be a smooth and continuous ramp of each DC output voltage from 10 to 90 of its final set point within the regulation band while loaded as specified in Section 3 3 The smooth turn on requires that during the 10 to 90 portion of the rise time the slope of the turn on waveform must be positive and have a value of between 0 V ms and Vout nominal V 0 1 ms Also for any 5 ms segment of the 10 to 90 rise time waveform a straight line drawn between the end points of the waveform segment must have a slope gt Vout nominal V 20 ms No voltage of opposite polarity shall be present on any output during turn on or turn off 3 4 7 Reset after Shutdown If the power supply latches into a shutdown state due to fault condition on its outputs the power supply shall return to normal operation only after the fault has been removed and the PS or AC input has been cycled OFF ON with a minimum OFF time of 1 second 3 4 8 5VSB at AC Power Down After AC power is removed the 5VSB standby voltage output should remain at its steady state value for the minimum holdup time specified in Section 3 3 8 until it begins to decrease in voltage The decrease shall be monotonic in nature dropping to 0 0 V There shall be no other perturbat
31. rmation Technology Equipment Class B American National Standard for Methods of Measurement of Radio Noise Emissions from Low Voltage Electrical and Electronic Equipment in the Range of 9 kHz to 40 GHz for EMI testing Electromagnetic compatibility generic immunity standard Limits for Harmonic Current Emission Class D Guidelines for the Suppression of Harmonics in Appliances and General Use Equipment Electromagnetic compatibility for industrial process measurement and control equipment Part 2 ESD Requirements Part 3 Immunity to Radiated Electromagnetic Fields Part 4 Electrical Fast Transients Burst Requirements Part 5 Surge Immunity Requirements International Graphic Symbol Standard Graphic Symbols for Use on Equipment FCC Rules Electromagnetic compatibility generic immunity Standard Part 1 Residential commercial and light industry Radio frequency electromagnetic field test standard Amplitude modulated Radio frequency electromagnetic field test standard Keyed carrier Radio frequency common mode test standard Voltage dips and interruptions test standard Page 7 Intel ATX Power Supply Design Guide Version 0 9 3 3 1 Electrical Specification The electrical requirements that follow are to be met over the environmental ranges specified in Section 5 unless otherwise noted AC Input Requirements The power supply shall be capable of supplying full rated output power over two input vol
32. sssssssssseseeseneeeenen enne 11 3 2 DC Output 11 3 244 DG Voltage Regulation erede t eeu 11 3 2 2 Remote Sensing sic ie tetti ete at ir tat d e incus 11 3 3 Typical Power Distribution 12 3 9 Bower Emitte dec eec ve Debe eta ve Se Eee teta dtu 13 3 9 2 EffICIOTIC iine rte eal tee an mee de e nn e 13 3 3 3 Output nennen nnne nennen sinn nennen 14 3 3 4 Output Transient 44 000000000 14 3 3 5 Capacitive ite e eei b ERREUR EFIE 14 3 9 6 Closed Loop Stability e eiit peat 14 3 3 7 4 5VDC 3 3VDC Power Sequencing sse nennen 15 3 3 48 Voltage Hold up Time ers cscs eese le le eere eek ae ete epp 15 3 4 Timing Housekeeping nnne nennen nes 16 PAV Re OMG ate honte nt dete A ELLE LL 16 9442 ON aee Nm eae eade To e OR dot yeh dede ee apo 17 2 49 G 5VS Bins ione RI ele kb pi ND S ape eite 17 3 4 4 POWOr On TIME zie tod a d e te ted ur nu p ea 17 3 4 5 e Ee eene there ce e ear etu a eret E 18 3 4 6 Overshoot at Turn on Turn off esses enne nnns 18 3 4
33. tage ranges rated 100 127 VAC and 200 240 VAC RMS nominal The correct input range for use in a given environment may be either switch selectable or auto ranging The power supply shall automatically recover from AC power loss The input voltage current and frequency requirements for continuous operation are stated below Note that nominal voltages for test purposes are considered to be within 1 0 V of nominal The power supply must be able to start up under peak loading at 90 VAC Table 1 AC Input Line Requirements Parameter Min Nom Max Unit Vin 115 VAC 90 115 135 VACims Vin 230 VAC 180 230 265 VACims Vin Frequency 47 63 Hz lin 115 VAC 7 0 Arms lin 230 VAC 3 5 Arms 3 1 1 Input Overcurrent Protection The power supply shall incorporate primary fusing for input overcurrent protection Fuses should be slow blow type or equivalent to prevent nuisance trips 3 1 2 Inrush Current Limiting Maximum inrush current from power on with power on at any point on the AC Sine and including but not limited to three line cycles shall be limited to a level below the surge rating of the input line cord AC switch if present bridge rectifier fuse and EMI filter components Repetitive ON OFF cycling of the AC input voltage should not damage the power supply or cause the input fuse to blow 3 1 3 Input Undervoltage The power supply shall contain protection circuitry such that the application of an input voltage below the mini
34. ve whenever the AC power is present It provides a power source for circuits that must remain operational when the five main DC output rails are in a disabled state Example uses include soft power control wake on LAN wake on modem intrusion detection or suspend state activities 5 VSB is required for the implementation of PS_ON The 5VSB output should be capable of delivering a minimum of 720 mA at 5 V 5 to external circuits Because trends indicate a growing demand for standby power it is recommended that a family of designs be created to supply 720 mA 1 0 A or 1 5 A to meet various customer requirements Overcurrent protection is required on the 5 VSB output regardless of the output current rating This ensures the power supply will not be damaged if external circuits draw more current than the supply can provide 3 4 4 Power on Time The power on time is defined as the time from when PS_ON is pulled low to when the 5VDC and 3 3VDC outputs are within the regulation ranges specified in Section 3 2 1 The power on time shall be less than 500 ms 5VSB shall have a power on time of 2 seconds maximum after application of valid AC voltages Page 17 Intel ATX Power Supply Design Guide Version 0 9 3 4 5 Risetime The output voltages shall rise from 1046 of nominal to within the regulation ranges specified in Section 3 2 1 within 0 1 ms to 20 ms 0 1 ms x lt 20 ms 3 4 6 Overshoot at Turn on Turn off The output v
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