Intel ATX
Power Supply Design Guide
Version 0.9
Страница 1: ...Intel ATX Power Supply Design Guide Version 0 9 ...
Страница 2: ...SSLY 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...
Страница 3: ...3 Output Ripple Noise 14 3 3 4 Output Transient Response 14 3 3 5 Capacitive Load 14 3 3 6 Closed Loop Stability 14 3 3 7 5VDC 3 3VDC Power Sequencing 15 3 3 8 Voltage Hold up Time 15 3 4 Timing Housekeeping Control 16 3 4 1 PWR_OK 16 3 4 2 PS_ON 17 3 4 3 5VSB 17 3 4 4 Power on Time 17 3 4 5 Risetime 18 3 4 6 Overshoot at Turn on Turn off 18 3 4 7 Reset after Shutdown 18 3 4 8 5VSB at AC Power Dow...
Страница 4: ...mental Requirements 26 5 1 Temperature 26 5 2 Thermal Shock Shipping 26 5 3 Humidity 26 5 4 Altitude 26 5 5 Mechanical Shock 26 5 6 Random Vibration 27 5 7 Acoustics 27 6 Electromagnetic Compatibility 28 6 1 EMI 28 6 2 Input Line Current Harmonic Content Optional 28 6 3 Magnetic Leakage Fields 28 7 Reliability 29 7 1 Component Derating 29 7 2 Mean Time Between Failures MTBF 29 8 Safety Requirement...
Страница 5: ...e 1 AC Input Line Requirements 8 Table 2 AC Line Voltage Transient Limits 9 Table 3 DC Output Voltage Regulation 11 Table 4 Typical Power Distribution for a 160 W Configuration 12 Table 5 Typical Power Distribution for a 200 W Configuration 12 Table 6 Typical Power Distribution for a 250 W Configuration 13 Table 7 Typical Power Distribution for a 300 W Configuration 13 Table 8 DC Output Noise Ripp...
Страница 6: ... 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 lin...
Страница 7: ... 74 SEC 207 94 Nordic National Requirement in addition to EN60950 CISPR 22 and EN 55022 Limits and Methods of Measurements of Radio Interference Characteristics of Information Technology Equipment Class B ANSI C63 4 1992 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...
Страница 8: ...ble 1 AC Input Line Requirements Parameter Min Nom Max Unit Vin 115 VAC 90 115 135 VACrms Vin 230 VAC 180 230 265 VACrms Vin Frequency 47 63 Hz Iin 115 VAC 7 0 Arms Iin 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 Limi...
Страница 9: ... 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 s...
Страница 10: ...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 o...
Страница 11: ...er 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 Vol...
Страница 12: ...eral 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 Output Min Current amps Max Current amps Peak Current 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 s...
Страница 13: ...erload 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 unde...
Страница 14: ...he transient step would be 0 3 18 A 5 4 A The 12VDC output will see transients up to 50 of the rated output current The transient slew rate will be 2 5 A µs 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 ...
Страница 15: ... 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 the low end nominal range Low 115 VAC 57 Hz or 230 VAC 47 Hz at maximum continuous output load as applicable for ...
Страница 16: ...thin 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 characteristic...
Страница 17: ...ge Iin 200 µA 2 0 V VIH open circuit Iin 0 5 25 V 3 4 3 5VSB 5VSB is a standby supply output that is active 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 5VSB is required ...
Страница 18: ...d 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 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 t...
Страница 19: ...ut down and latch off or fold back for shorting the negative rails The 5VSB 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 ...
Страница 20: ...sh German Spanish French Chinese and Japanese with universal warning markings Manufacturer information manufacturer s name part number and lot date code in human readable text format etc Nominal AC input operating voltages 100 127 VAC and 200 240 VAC and current rating certified by all agencies specified in Section 8 DC output voltages and current ratings 4 2 Physical Dimensions The supply shall b...
Страница 21: ...t grill 55 open area Optional air inlet area Optional air inlet area 53 REF WIRE HARNESS 16 REF 150 REF 20 0 2X 4 0X6 2X 146 0 140 REF No 6 32 UNC 2B THREADED HOLE 4X 138 0 86 REF 74 0 6 0 114 0 64 0 16 0 6 0 2X Notes unless otherwise specified 1 Dimensions are in mm 2 Drawing is not to scale See Note 4 Figure 2 Power Supply Dimensions for Chassis in Which the P S Does Not Cool Processor ...
Страница 22: ...0 138 0 3 Tolerances X 1 X X 0 5 4 If a wire grill is required for acoustics or thermals the grill and screws must be flush mounted 5 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 No 6 32 UNC 2B THREADED HOLE 4X Notes unless otherwise specified 1 Dimensions are...
Страница 23: ...y 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...
Страница 24: ...or 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 ...
Страница 25: ... 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 ...
Страница 26: ... to 70 C 15 C min dT dt 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 95 RH is achieved with a dry bulb temperature of 55 C and a wet bulb temperature of 54 C 5 4 Altitude Operating To 10 000 ft Nonoperating To 50 000 ft 5 5 ...
Страница 27: ...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 ...
Страница 28: ...C 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 leakag...
Страница 29: ...eptions are subject to final approval Magnetic saturation of any transformer will not be allowed under any line load 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 ...
Страница 30: ...UL 1950 3rd 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 ex...
Страница 31: ...er country national deviations CB report must include evaluation to EN60 950 A1 A2 A3 A4 and EMKO TSE 74 SEC 207 94 All 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 8 3 Proscribed Materials Cadmium should not be used in painting or plating No quaternary salt electrolytic capaci...
