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ATX / ATX12V

Power Supply Design Guide

Version 1.1

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Summary of Contents for ATX

Page 1: ...ATX ATX12V Power Supply Design Guide Version 1 1 ...

Page 2: ...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 ...

Page 3: ...cal Power Distribution 11 3 2 4 Power Limit 14 3 2 5 Efficiency 14 3 2 6 Output Ripple Noise 15 3 2 7 Output Transient Response 16 3 2 8 Capacitive Load 16 3 2 9 Closed loop Stability 16 3 2 10 5 VDC 3 3 VDC Power Sequencing 17 3 2 11 Voltage Hold up Time 17 3 3 Timing Housekeeping Control 17 3 3 1 PWR_OK 17 3 3 2 PS_ON 18 3 3 3 5 VSB 19 3 3 4 Power on Time 19 3 3 5 Risetime 19 3 3 6 Overshoot at ...

Page 4: ...A 28 4 5 4 Peripheral Connector s 28 4 5 5 Floppy Drive Connector 28 5 Environmental 29 5 1 Temperature 29 5 2 Thermal Shock Shipping 29 5 3 Humidity 29 5 4 Altitude 29 5 5 Mechanical Shock 29 5 6 Random Vibration 30 5 7 Acoustics 30 6 Electromagnetic Compatibility 31 6 1 EMI 31 6 2 Input Line Current Harmonic Content and Line Flicker Required for Sales in Europe and Japan 31 6 3 Magnetic Leakage ...

Page 5: ... Regulation 10 Table 4 Typical Power Distribution for a 160 W ATX Configuration 11 Table 5 Typical Power Distribution for a 200 W ATX Configuration 12 Table 6 Typical Power Distribution for a 250 W ATX Configuration 12 Table 7 Typical Power Distribution for a 300 W ATX Configuration 12 Table 8 Typical Power Distribution for a 200 W ATX12V Configuration 13 Table 9 Typical Power Distribution for a 2...

Page 6: ...motherboard power requirements 1 2 New for ATX12V as Compared with ATX Power Supply This section briefly summarizes the major changes made to this document that now includes the ATX12V power supply An earlier design guide covered only the ATX power supply There are also a few changes from Version 1 0 to 1 1 increased 3 3 V current more explanation for power sharing 1 2 1 ATX12V A new superset of t...

Page 7: ... supply designer Such an approach can effectively support both 5 VDC or 12 VDC centric motherboards The standard ATX power supply definition will be maintained in parallel with ATX12V despite the downward compatibility of ATX12V because both offer distinct advantages to the industry An ATX power supply supports motherboards that rely on DC DC conversion from 5 VDC or 3 3 VDC only This limitation a...

Page 8: ...logy Equipment Including Business Equipment EMKO TSE 74 SEC 207 94 Nordic national requirement in addition to EN 60950 CISPR 22 1997 3 rd edition EN 55022 1998 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 ...

Page 9: ...Vin Frequency 47 63 Hz 1 Nominal voltages for test purposes are considered to be within 1 0 V of nominal 3 1 1 Input Overcurrent Protection The power supply shall incorporate primary fusing for input overcurrent protection to prevent damage to the power supply and meet product safety requirements Fuses should be slow blow type or equivalent to prevent nuisance trips 3 1 2 Inrush Current Limiting M...

Page 10: ...oise Emission of molten material 3 2 DC Output 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 specifi...

Page 11: ...loading The area within each plotted perimeter represents the power usage of a motherboard and system platform At a minimum the power supply must have the capability to provide power for the area inside the plotted area The power supply may provide additional margin for the area outside the perimeter In each graph the vertical line on the right side shows the recomended combined power from 3 3 V a...

Page 12: ...2 0 5 VDC 1 0 25 0 3 3 VDC 0 3 16 0 5 VDC 0 0 0 3 12 VDC 0 0 0 8 5 VSB 0 0 1 5 2 5 See graph at right for power sharing Table 7 Typical Power Distribution for a 300 W ATX Configuration Output Min Current amps Max Current amps Peak Current amps 12 VDC 0 0 12 0 14 0 5 VDC 1 0 30 0 3 3 VDC 0 3 20 0 5 VDC 0 0 0 3 12 VDC 0 0 0 8 5 VSB 0 0 1 5 2 5 See graph at right for power sharing 0 20 40 60 80 100 1...

Page 13: ...n for a 200 W ATX12V Configuration Output Min Current amps Max Current amps Peak Current amps 12 VDC 0 0 10 0 12 0 5 VDC 0 1 21 0 3 3 VDC 0 3 14 0 5 VDC 0 0 0 3 12 VDC 0 0 0 8 5 VSB 0 0 1 5 2 5 See graph at right for power sharing Table 9 Typical Power Distribution for a 250 W ATX12V Configuration Output Min Current amps Max Current amps Peak Current amps 12 VDC 0 0 13 0 16 0 5 VDC 0 1 25 0 3 3 VD...

Page 14: ...m configuration In the low power Energy Star state the AC input power is limited to 30 W or 15 of the rated maximum DC output power for the configuration whichever is greater For example in a 160 W system configuration the Energy Star input power limit is 160 W 0 15 24 W 30 W for a 300 W configuration 300 W 0 15 45 W While a minimum power supply efficiency of 56 is often recommended at Energy Star...

Page 15: ...itor and a 10 µF electrolytic capacitor to simulate system loading See Figure 1 Table 11 DC Output Noise Ripple Output Max Ripple Noise mVpp 12 VDC 120 5 VDC 50 3 3 VDC 50 5 VDC 100 12 VDC 120 5 VSB 50 Scope Load V out V return Power Supply AC Hot AC Neutral AC Ground Scope Note Use Tektronix TDS460 Oscilloscope or equivalent and a P6046 probe or equivalent Filter Note 0 1uf Kemet C1206C104K5RAC o...

Page 16: ...l of the following conditions Simultaneous load steps on the 12 VDC 5 VDC and 3 3 VDC outputs all steps occurring in the same direction Load changing repetition rate of 50 Hz to 10 kHz AC input range per Section 3 1 Capacitive loading per Table 13 3 2 8 Capacitive Load The power supply should be able to power up and operate normally with the following capacitances simultaneously present on the DC ...

Page 17: ... 3 3VDC O P s VAC T5 T1 Figure 2 Power Supply Timing Notes T1 is defined in Section 3 3 4 T2 is defined in Section 3 3 5 T3 T4 T5 and T6 are defined in Table 14 3 3 1 PWR_OK PWR_OK is a power good signal It should be asserted high by the power supply to indicate that the 12 VDC 5VDC and 3 3VDC outputs are above the undervoltage thresholds listed in Section 3 2 1 and that sufficient mains energy is...

Page 18: ...e power supply should turn on the five main DC output rails 12VDC 5VDC 3 3VDC 5VDC and 12VDC When PS_ON 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 Table 15 lists PS_ON signal characteristics The power...

Page 19: ...d power during a wake up event If an external USB device generates the event there may be peak currents as high as 2 5A lasting no more than 500mS 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 3 4 Power on Time The power on time is ...

Page 20: ...the power supply shall return to normal operation only after the fault has been removed and the PS_ON or AC input has been cycled OFF ON with a minimum OFF time of 1 second 3 3 8 5 VSB at AC Power down After AC power is removed the 5 VSB standby voltage output should remain at its steady state value for the minimum hold up time specified in Section 3 2 11 until the output begins to decrease in vol...

Page 21: ... circuit energy in any output shall not exceed 240 VA per IEC 60950 requirements 3 4 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 4 4 Overcurrent Protection Overload currents applied to each tested output rail will cause the output to trip before reaching or exceed...

Page 22: ...code etc in human readable text and or bar code formats Nominal AC input operating voltages 100 127 VAC and 200 240 VAC and current rating certified by all applicable safety agencies Section 8 DC output voltages and current ratings 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 ...

Page 23: ...nal 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 psu_grills Preferred locations of manufacturer label Figure 4 Power Supply Dimensions for Chassis in Which the P S Does N...

Page 24: ... 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 in mm 2 Drawing is not to scale 64 0 1...

Page 25: ...it typically senses the temperature of the secondary heatsink and or incoming ambient air and adjusts the fan speed as necessary to keep power supply and system component temperatures within specification Both the power supply and system designers should be aware of the dependencies of the power supply and system temperatures on the control circuit response curve and fan size and should specify th...

Page 26: ...eptacle may be considered the mains disconnect 4 5 DC Connectors Figure 6 shows pinouts and profiles for typical ATX power supply DC harness connectors 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 output wire harness lengths as these are largely a function of the intended end use ...

Page 27: ...y Connectors Pin side view not to scale 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 sense return wire pin 11 22 AWG For 300 W configurations 16 AWG is recommended for all 12 VDC 5 VDC 3 3 VDC and COM Pin Signal Color Pin Signal Color 1 3 3VDC Orange 11 1...

Page 28: ... for Configurations with 3 3 VDC Output 18 A or 5 V Output 24 A 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 4 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 Blac...

Page 29: ... 40 C to 70 C Maximum temperature rate of change of 20 C hr 5 2 Thermal Shock Shipping Nonoperating 40 C to 70 C 15 C min dT dt 30 C min Tested for 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 temper...

Page 30: ...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 31: ...d load The load shall be adjusted as follows for three tests No load on each output 50 load 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 and Line Flicker Required for Sales in Europe and Japan For sales in Japan or Europe the power supply shall meet the requirements of EN 61000 3 2 ...

Page 32: ... any transformer will not be allowed under any line load startup or transient condition including 100 transients on the five main outputs or 5 VSB 7 2 Mean Time Between Failures MTBF The MTBF of the power supply can be calculated with the Part Stress Analysis method of MIL HDBK 217F using the quality factors listed in MIL HDBK 217F A target calculated MTBF of the power supply is greater than 100 0...

Page 33: ...est open circuit voltage short circuit current and maximum VA output and abnormal testing to include stalled fan tests and voltage select switch mismatch The enclosure must meet fire enclosure mechanical test requirements per clauses 2 9 1 and 4 2 of the above mentioned standard Production hi pot testing must be included as a part of the certification and indicated as such in the certification rep...

Page 34: ...eviations 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 8 3 Proscribed Materials Cadmium should not be used in painting or plating No quaternary salt electrolytic capacitors shall be used Mercury shall not be used The use of CFCs or HFCs shall not be us...

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