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SFX12V Specific

Guidelines 4.0

336521

SFX12V Specific Guidelines 4.0

For Small Form Factor with 12-volt connector power supplies.

All Form Factors Revision Summary:

PSU DG

CFX12V

LFX12V

ATX12V

SFX12V

TFX12V

Flex ATX

2.0

3.0

4.0

3.0

2.0

14.1

Lower Profile Package - Physical Dimensions -

REQUIRED

The power supply shall be enclosed and meet the physical outline shown in

Figure

14-1

14.2

Fan Requirements - REQUIRED

The fan will draw air from the computer system cavity pressurizing the power supply

enclosure. The power supply enclosure shall exhaust the air through a grill located on

the rear panel. Refer to

Figure 14-2

. The movement of the fan to the computer

system cavity is to help limit the acoustic noise of the unit.

The fan will be 40 mm.

Summary of Contents for ATX 3.0

Page 1: ...Document Number 336521 ATX Version 3 0 Multi Rail Desktop Platform Power Supply Design Guide Revision 2 0 February 2022...

Page 2: ...without limitation the implied warranties of merchantability fitness for a particular purpose and non infringement as well as any warranty arising from course of performance course of dealing or usage...

Page 3: ...4 Electrical 30 4 1 AC Input REQUIRED 30 4 1 1 Input Over Current Protection REQUIRED 30 4 1 2 Inrush Current REQUIRED 30 4 1 3 Input Under Voltage REQUIRED 30 4 2 DC Output REQUIRED 31 4 2 1 DC Volta...

Page 4: ...rive Connector Do Not Include For Historical Reference Only 50 5 2 2 4 PCI Express PCIe Add in Card Connectors Recommended 50 5 2 2 5 12 V Power Connector 55 5 2 2 6 Serial ATA Connectors REQUIRED 56...

Page 5: ...irements REQUIRED 81 15 TFX12V Specific Guidelines 3 0 83 15 1 Physical Dimensions REQUIRED 83 15 2 Mounting Options RECOMMENDED 85 15 3 Chassis Requirements RECOMMENDED 86 16 Flex ATX Specific Guidel...

Page 6: ...rt Terminology 16 Table 2 1 12V2 Current for Processor Configurations 17 Table 3 1 PCI Express CEM Add in Card Power Excursion Limits Table45 21 Table 3 2 PCIe AIC and PSU Power Budget used for Peak P...

Page 7: ...signment 150 Watts 52 Table 5 6 PCIe 2x4 Auxiliary Power Connector Sense Pin Decoding by AIC 52 Table 5 7 PCIe 12VHPWR Auxiliary Power Connector Pin Assignment 600 Watts 55 Table 5 8 12 V Power 4 pin...

Page 8: ...REQUIRED RECOMMENDED or OPTIONAL items January 2006 1 0 Added 12V2 Current for Processor Configurations table Added revision numbers to form factor specific chapters June 2006 1 1 Removed outdated EN...

Page 9: ...AC power consumption Updated Table 4 9 Power Supply Timing recommended value Updated Table 4 15 Efficiency versus Load July 2012 1 31 Updated Table 4 5 Recommended System DC and AC power consumption C...

Page 10: ...8 pin connector pin out Updated Section 6 1 Acoustic note about acoustic targets can be customer specific Sections 11 12 13 14 15 and 16 Added form factor revision summary to beginning of each form fa...

Page 11: ...d 16 CFX12V Specific Guidelines to version 1 63 LFX12V Specific Guidelines to version 1 43 ATX12V Specific Guidelines to version 2 53 SFX12V Specific Guidelines to version 3 43 TFX12V Specific Guideli...

Page 12: ...onse to PS_ON changes beyond 100 ms Simplified Table 4 14 Low Load Efficiency Requirements Added mention for label of all PSUs should state revision of the specification that it meets and 12VHPWR labe...

Page 13: ...enerically called an Alternative Low Power Mode ALPM Some examples of Alternative Low Power Modes are Microsoft Windows 10 Modern Standby or Google Chrome Lucid Sleep These new power states have creat...

Page 14: ...943 China CNS 14336 Taiwan BSMI FCC Class B Part 15 Radiated and Conducted Emissions CISPR 22 EN55022 5th Edition Radiated and Conducted Emissions EN55024 ITE Specific Immunity EN 61000 4 2 Electrosta...

Page 15: ...cronym Convention Terminology Description ALPM Alternative Low Power Mode ALPM replaces the traditional Sleep Mode ACPI S3 with a new sleep mode An example of ALPM is with Microsoft Windows Modern Sta...

Page 16: ...e nominal voltage VSB or Standby Voltage An output voltage that is present whenever AC power is applied to the AC inputs of the supply Table 1 2 Support Terminology Category Description Optional The s...

Page 17: ...levels for the 12 Volt rail above 18 Amps must be split into multiple 12 V rails 2 Continuous current is defined for the processors PL2 Turbo power limit since desktop processors are expected to stay...

Page 18: ...es configured for the PCIe graphics cards Alternatively a higher power overclocked CPU system mounting a single lower power graphics card may require more 12V CPU power and a single plug for PCIe powe...

Page 19: ...ngth of the 18 AWG conductor This recommendation is based on common design practice The PSU and system designer may deviate from this guidance but remains responsible for designing the PSU to meet all...

Page 20: ...bsolute power consumption of each Add in Card to a hard limit such as 10 W 75 W 150 W 225 W or 300 W even when it would be advantageous for it to make short duration high current demands on a power ra...

Page 21: ...t would introduce backward compatibility risks with legacy power supplies A second Engineering Change Request Power Excursion Limits up to 300 Watts is under consideration This ECR would define simila...

Page 22: ...rithm function 4 Add in Card must at all times and concurrently adhere to power excursion limits for all time interval lengths as well as the limits defined for Power Supply Rail Requirements in Table...

Page 23: ...plans less ROP power then the PSU size can also decrease In the case of ROP values lower than what is shown in Table 3 2 the calculations should be done for Peak Power Requirement for this specific sy...

Page 24: ...ed Size PSU 450 Watts PSUs without 12VHPWR Connector Power Excursion of PSU Rated Size PSU 450 Watts 12VHPWR Connector present Time for Power Excursion TE Testing Duty Cycle 100 100 Infinite 110 120 1...

Page 25: ...e and formulas to calculate TC and TE power values for different PSU sizes will be detailed in the Desktop Platform Form Factor Power Supply Test Plan Doc 338448 3 2 PCIe AIC Auxiliary Power Connector...

Page 26: ...ontinuous 1 second interval 4 The main reference limit is the maximum allowed sustained power per connector and Add in Card type Add in Card and System must concurrently comply with all power and volt...

Page 27: ...rt for the SENSE0 SENSE1 sideband signals does not rely on any of the other optional sideband signals defined for the 12VHPWR connector Table 3 6 PCI Express 12VHPWR Connector Power Limits Sense0 Sens...

Page 28: ...eting Sense Detect Registers This allows the system to correlate which system and power cables are used with specific PCIe card slot Note that this sideband signal is for the purpose of the system pow...

Page 29: ...ch card gets 300 Watts Three or Four PCIe Add in Cards are detected each card gets 150 Watts 3 3 4 Sideband Signals DC Specifications Required The four sideband signals defined for the 12VHPWR connect...

Page 30: ...15 VAC 90 115 135 VACrms Vin 230VAC 180 230 265 VACrms Vin Frequency 47 63 Hz NOTE Nominal voltages for test purposes are considered to be within 1 0 V of nominal 4 1 1 Input Over Current Protection R...

Page 31: ...tion Output Range Min Nom Max Unit 12V1DC2 5 7 11 20 12 00 12 60 V 12V2DC2 5 7 11 20 12 00 12 60 V 5VDC 5 4 75 5 00 5 25 V 3 3VDC 5 3 14 3 30 3 47 V 12VDC3 10 10 80 12 00 13 20 V 5VSB 5 4 75 5 00 5 25...

Page 32: ...supplies that have one combined 12V rail shall perform Dynamic testing on the one 12V rail with multiple tests which simulate different system level workloads 12V1 total system 12V2 CPU Load and 12V3...

Page 33: ...d 2013 levels and 2014 ErP Lot 3 requirements Additionally if any Computers use an Alternative Low Power Mode ALPM then the 5VSB standby efficiency has similar requirements as shown below Table 4 5 Re...

Page 34: ...Capacitive Load RECOMMENDED The power supply should be able to power up and operate within the regulation limits defined in Table 4 2 with the following capacitances simultaneously present on the DC o...

Page 35: ...phase margin and 10 dB gain margin is recommended at both the maximum and minimum loads 4 2 8 5V DC 3 3V DC Power Sequencing REQUIRED The 12V1 DC 12V2 DC and 5 VDC output levels must be equal to or g...

Page 36: ...47 Hz at maximum continuous output load as applicable for a minimum of 17ms T5 T6 4 2 10 12V2 DC Minimum Loading REQUIRED The power supply 12 V2DC shall maintain output regulations per Table 4 2 and m...

Page 37: ...ibility problems exist especially for previous generation motherboards and systems 3 T5 to be defined for both max min load condition 4 PSUs are recommended to label or indicate the timing value for s...

Page 38: ...must 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 To support systems with ALPM this is required for...

Page 39: ...e 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 Alternative...

Page 40: ...tion 4 3 4 4 3 6 Rise Time REQUIRED The output voltages shall rise from 10 of nominal to within the regulation ranges specified in Table 4 2 within 0 2 ms to 20 ms 0 2 ms T2 20 ms The total time for R...

Page 41: ...he power supply latches into a shutdown state because of a fault condition on its outputs the power supply shall return to normal operation only after the fault has been removed and the PS_ON has been...

Page 42: ...nce 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 over voltage condition on any or...

Page 43: ...ion must be designed to limit the current to operate within safe operating conditions Over current protection schemes where only the voltage output that experiences the over current event is shut off...

Page 44: ...Input voltage of 115V Table 4 13 Efficiency versus Load Minimum Requirements Loading Full Load 100 Typical Load 50 Light Load 20 REQUIRED Minimum Efficiency 70 72 65 Low Load Efficiency Computers have...

Page 45: ...Load for CEC PC Computers with High Expandability Computers Visit ENERGY STAR Computers Ver 8 ES v8 website for more details https www energystar gov products spec computers_version_8_0_pd Visit CEC w...

Page 46: ...High Expandability Computers definition check CEC computer regulation The RECOMMENDED minimum efficiency levels shown in Table 4 15 are required for internal power supplies within the ENERGY STAR for...

Page 47: ...text Do not remove this cover Trained service personnel only No user serviceable components inside must be in English German Spanish French Chinese and Japanese with universal warning markings Power S...

Page 48: ...rements for output wire harness lengths as these are largely a function of the intended end use chassis motherboard and peripherals Ideally wires should be short to minimize electrical airflow impedan...

Page 49: ...5 1 Main Power Connector Pin Out Pin Signal Color Pin Signal Color 1 3 3V DC Orange 13 3 3V DC 3 3 V default sense Orange Brown 2 3 3V DC Orange 14 12V DC Blue 3 COM Black 15 COM Black 4 5V DC Red 16...

Page 50: ...d by any PCI Express Add in Card AIC The most common PCIe Add in Card that uses these connectors are discrete graphics cards The PCIe CEM Specification defines different connectors based on the power...

Page 51: ...on a PCIe Add in Card and a mating 2x4 Cable Plug harness The 2x4 PCB header is designed to accept both the mating 2x4 Cable Plug as well as the 2x3 cable plug for backward compatibility The Add in C...

Page 52: ...nded it must be connected to ground either directly in the power supply or via a jumper to an adjacent ground pin in the connector 5 2 2 4 3 PCI Express PCIe 12VHPWR Auxiliary Power Connector Optional...

Page 53: ...Mechanical 336521 53 Mated Connector Latch Retention 45 00 N minimum when plug pulled axially Figure 5 3 12VHPWR Cable Plug Connector...

Page 54: ...onnector that does not affect matting with its associated plug may happen Reference latest PCI SIG documentation for latest information about this connector 12VHPWR Cable Plug Assembly Contact and Hou...

Page 55: ...k 2 12V3 V4 Yellow 8 COM Black 3 12V3 V4 Yellow 9 COM Black 4 12V3 V4 Yellow 10 COM Black 5 12V3 V4 Yellow 11 COM Black 6 12V3 V4 Yellow 12 COM Black S1 CARD_PWR_STABLE Blue S3 SENSE0 Blue S2 CARD_CBL...

Page 56: ...al ATA Power Connector can be found in the Serial ATA High Speed Serialized AT Attachment specification Section 6 3 Cables and connector specification http www serialata org Note Connector pin numbers...

Page 57: ...stem level thermal and acoustic performance The circuit typically senses the temperature of the secondary heatsink and or incoming ambient air and adjusts the fan speed as necessary to keep power supp...

Page 58: ...jects within 0 5 inches of the intake or exhaust of the fan itself A flush mount wire fan grill can be used instead of a stamped metal vent for improved airflow and reduced acoustic noise The limitati...

Page 59: ...d at sea level This test point is chosen to represent the environment seen inside a typical system at the idle acoustic test condition with the 43 C being derived from the standard ambient assumption...

Page 60: ...7 2 Thermal Shock Shipping RECOMMENDED Non operating 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 7 3...

Page 61: ...on RECOMMENDED Non operating 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 p...

Page 62: ...hods in 47 CFR 15 32 b and authorized under the Declaration of Conformity process as defined in 47 CFR 2 906 using the process in 47 CFR 2 1071 through 47 CFR 2 1077 8 2 Immunity REQUIRED The power su...

Page 63: ...Flicker REQUIRED The power supply shall meet the specified limits of EN61000 3 3 IEC 61000 3 3 and amendment A1 to EN 61000 3 3 IEC 61000 3 3 A1 for voltage fluctuations and flicker for equipment draw...

Page 64: ...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 mention...

Page 65: ...QUIRED Quaternary salt and PCB electrolytic capacitors shall not be used REQUIRED CFC s or HFC s shall not be used in the design or manufacturing process REQUIRED Mercury shall not be used REQUIRED So...

Page 66: ...that PS_ON only toggle once when turn on The S0ix mode is used in systems that use Alternative Low Power Modes If the computer turns on off every 180 seconds the worse case scenario would be 480 times...

Page 67: ...or with 12 volt connector power supplies All Form Factors Revision Summary PSU DG CFX12V LFX12V ATX12V SFX12V TFX12V Flex ATX 2 0 2 0 2 0 3 0 4 0 3 0 2 0 11 1 Physical Dimensions REQUIRED The power su...

Page 68: ...SFX12V TFX12V Flex ATX 2 0 2 0 2 0 3 0 4 0 3 0 2 0 12 1 Physical Dimensions REQUIRED The power supply shall be enclosed and meet the physical outline shown in Figure 12 1 applicable Mechanical detail...

Page 69: ...LFX12V Specific Guidelines 2 0 336521 69 Figure 12 2 Mechanical Details...

Page 70: ...LFX12V Specific Guidelines 2 0 70 336521 Figure 12 3 PSU Slot Feature Detail...

Page 71: ...LFX12V Specific Guidelines 2 0 336521 71 Figure 12 4 Recommended Chassis Tab Feature...

Page 72: ...elines 3 0 For ATX Form Factor with 12 volt connector power supplies All Form Factors Revision Summary PSU DG CFX12V LFX12V ATX12V SFX12V TFX12V Flex ATX 2 0 2 0 2 0 3 0 4 0 3 0 2 0 Figure 13 1 Power...

Page 73: ...ATX12V Specific Guidelines 3 0 336521 73 Figure 13 2 Power Supply Dimensions for Chassis that Require Top Venting...

Page 74: ...Physical Dimensions REQUIRED The power supply shall be enclosed and meet the physical outline shown in Figure 14 1 14 2 Fan Requirements REQUIRED The fan will draw air from the computer system cavity...

Page 75: ...SFX12V Specific Guidelines 4 0 336521 75 Figure 14 1 40 mm Profile Mechanical Outline Figure 14 2 Chassis Cutout...

Page 76: ...the computer system cavity pressurizing the power supply enclosure The power supply enclosure shall exhaust the air through a grill located on the rear panel Refer to Figure 14 4 Moving the fan to the...

Page 77: ...SFX12V Specific Guidelines 4 0 336521 77 Figure 14 3 Top Mount Fan Profile Mechanical Outline...

Page 78: ...nd meet the physical outline shown in Figure 14 6 14 6 Fan Requirements REQUIRED The fan will draw air from the computer system cavity pressurizing the power supply enclosure The power supply enclosur...

Page 79: ...SFX12V Specific Guidelines 4 0 336521 79 Figure 14 6 Reduced Depth Top Mount Fan Profile Mechanical Outline Figure 14 7 Chassis Cutout...

Page 80: ...Fan Requirements REQUIRED The fan will draw air from the computer system cavity pressurizing the power supply enclosure The power supply enclosure shall exhaust the air through a grill located on the...

Page 81: ...ended that a thermally sensitive fan speed control circuit be used to balance system level thermal and acoustic performance The circuit typically senses the temperature of an internal heatsink and or...

Page 82: ...SFX12V Specific Guidelines 4 0 82 336521 Figure 14 10 PS3 Mechanical Outline...

Page 83: ...fic Guidelines 3 0 For Thin Form Factor with 12 volt connector power supplies All Form Factors Revision Summary PSU DG CFX12V LFX12V ATX12V SFX12V TFX12V Flex ATX 2 0 2 0 2 0 3 0 4 0 3 0 2 0 15 1 Phys...

Page 84: ...TFX12V Specific Guidelines 3 0 84 336521 Figure 15 2 Dimensions and Recommended Feature Placements not to scale...

Page 85: ...e unit can be mounted using one of the mounting holes on the front end non vented end or a chassis feature can be designed to engage the slot provided in the bottom of the supply In order to accommoda...

Page 86: ...o ensure the power supply can be easily integrated the following features should be designed into a chassis intended to use a TFX12V power supply Chassis cutout normally in the rear panel of the chass...

Page 87: ...TFX12V Specific Guidelines 3 0 336521 87 Figure 15 6 Suggested Mounting Tab chassis feature...

Page 88: ...fic Guidelines 2 0 For Flex ATX Form Factor with 12 volt connector power supplies All Form Factors Revision Summary PSU DG CFX12V LFX12V ATX12V SFX12V TFX12V Flex ATX 2 0 2 0 2 0 3 0 4 0 3 0 2 0 16 1...

Page 89: ...Flex ATX Specific Guidelines 2 0 336521 89 Figure 16 2 Dimensions and Recommended Feature Placements not to scale...

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