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Summary of Contents for Intel ATX
- Page 1 ATX Multi Rail Desktop Power Supply Design Guide June 2020 Revision 003 Document Number: 336521 - 003...
- Page 2 You may not use or facilitate the use of this document in connection with any infringement or other legal analysis concerning Intel products described herein. You agree to grant Intel a non-exclusive, royalty-free license to any patent claim thereafter drafted which includes subject matter disclosed herein.
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Page 3: Table Of Contents
Contents Introduction ..................... 8 Alternative Low Power Mode for Power Supplies .......... 8 References .................... 8 Terminology ..................9 Processor Configurations .................. 11 Processor Configurations – Recommended ..........11 High End Desktop Market Processor Considerations ........12 2.2.1 Modular Power Supply Connectors ..........12 2.2.2 Overclocking Recommendations .......... - Page 4 Mechanical ..................... 30 Labeling and Marking - Recommended ............ 30 Connectors - Required ................30 4.2.1 AC Connector ................. 30 4.2.2 DC Connectors ................ 30 Airflow and Fans - Recommended ............35 4.3.1 Fan Location and Direction ............35 4.3.2 Fan Size and Speed ..............
- Page 5 Physical Dimensions - Required .............. 59 14.2 Mounting Options - Recommended ............61 14.3 Chassis Requirements - Recommended ........... 62 Flex ATX Specific Guidelines 1.23 ..............64 15.1 Physical Dimensions – Required .............. 64 Figures Figure 3-1: Differential Noise Test Setup ............17 Figure 3-2: Power Supply Timing...............
- Page 6 Tables Table 1-1: Conventions and Terminology .............. 9 Table 1-2: Support Terminology ................ 10 Table 2-1: 12V2 Current for Processor Configurations .......... 11 Table 3-1: AC Input Line Requirements .............. 14 Table 3-2: DC Output Voltage Regulation ............15 Table 3-3: DC Output Transient Step Sizes ............15 Table 3-4: Recommended System DC and AC Power Consumption ......
- Page 7 − − SFX12V Specific Guidelines to version 3.42 TFX12V Specific Guidelines to version 2.52 − − Flex ATX Specific Guidelines to version 1.22 • Removed Chapter 16 test plan. Refer to Document #595284 for test plan. • Added Section 9.2. Reliability – PS_ON# toggle for S0ix mode.
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Page 8: Introduction
Introduction Introduction This document provides design suggestions for various power supply form factors. The power supplies are primarily intended for use with desktop system designs. It should not be inferred that all power supplies must conform exactly to the content of this document, though there are key parameters that define mechanical fit across a common set of platforms. -
Page 9: Terminology
Introduction Document Document Title Number /Source American National Standard for Methods of Measurement of Radio-Noise Emissions from Low-Voltage Electrical and Electronic Equipment in the Range ANSI C63.4 of 9 kHz to 40 GHz for EMI testing UL 60950-1 First Edition –CAN/CSA-C22.2 No. 60950-1-03 First Edition, IEC 60950-1: 2001 + Amendments and National Deviations, EN 60950-1: 2001 + Amendment A11:... -
Page 10: Table 1-2: Support Terminology
Introduction Acronym/Convention Description /Terminology A waveform changes from one level to another in a steady fashion, Monotonically without oscillation. MTBF Mean time between failure. The periodic or random signals over frequency band of 0 Hz to 20 Noise MHz. Computers that do not use Alternative Sleep Mode use traditional Non-ASM Sleep Mode (ACPI S3). -
Page 11: Processor Configurations
All future processor power / PSU Current requirements will be defined in a document titled ATX12VO and ATX12V PSU Design Guide Addendum (# 621484) that will apply to both Single Rail and Multi Rail ATX Power Supplies. The above table is associated with different power level requirements of the Generation Intel Core Processor Family Datasheet for 35W, 65W and 125W skus. -
Page 12: High End Desktop Market Processor Considerations
Processor Configurations High End Desktop Market Processor Considerations The High End Desktop market requires power supplies with higher power levels than the mainstream market. Sometimes the EPS12V specification is referenced for these designs. The EPS12V specification is a power supply form factor for the server market. Here in the Desktop Power Supply design guide we are including higher power levels to incorporate these higher performance desktop computers. -
Page 13: Overclocking Recommendations
Processor Configurations 2.2.2 Overclocking Recommendations The power levels listed in Section 2.1 are for processors that follow the Plan Of Record (POR) power levels that include Turbo Mode. If the processor is overclocked then power levels will be increased. If the power supply is expected to support end users who desire to overclock then the 12V power rail to the processor should be higher than what is listed in Table... -
Page 14: Electrical
Electrical Electrical The following electrical requirements are required and must be met over the environmental ranges as defined in Chapter 6 (unless otherwise noted). AC Input - Required The below table lists AC input voltage and frequency requirements for continuous operation. -
Page 15: Dc Output - Required
Electrical DC Output - Required 3.2.1 DC Voltage Regulation – Required The DC output voltages are required to remain within the regulation ranges shown in the below table, when measured at the load end of the output connectors under all line, load, and environmental conditions specified in Chapter Table 3-2: DC Output Voltage Regulation... -
Page 16: Remote Sensing - Recommended
12V rail or other configurations. This recommendation comes from Graphics card recommendations and should be applied to the amount of current of the 12V rails associated with the graphic card connections. This is not an Intel ®... -
Page 17: Output Ripple Noise - Required
Electrical 3.2.5 Output Ripple Noise - Required The output ripple and noise requirements listed in the below table shall be met throughout the load ranges specified for the appropriate form factor and under all input voltage conditions as specified in Table 3-1. -
Page 18: Capacitive Load - Recommended
Electrical 3.2.6 Capacitive Load – Recommended The power supply should be able to power up and operate within the regulation limits defined in Table 3-2, with the following capacitances simultaneously present on the DC outputs. Table 3-6: Output Capacitive Loads Output Capacitive Load (μF) +12V1DC... -
Page 19: Voltage Hold-Up Time - Required
Electrical Figure 3-2: Power Supply Timing 3.2.9 Voltage Hold-Up Time - Required The power supply shall maintain output regulations per Table 3-2 despite a loss of input power at the low-end nominal range-115 VAC / 47 Hz or 230 VAC / 47 Hz – at maximum continuous output load as applicable for a minimum of 17ms (T5+T6). -
Page 20: Timing, Housekeeping, And Control - Required
Electrical Timing, Housekeeping, and Control – Required Figure 3-3: Power on Timing Table 3-8: Power Supply Timing Value Parameter Description Legacy Recommended Required Timings for ALPM AC power on time <2s Power-on time < 500ms < 200ms <150ms Rise time 0.2 –... -
Page 21: Pwr_Ok - Required
Electrical NOTES: Value in the Legacy column list timings for power supplies designed before the year 2020. In 2020, the T1 and T3 timings have moved from the Legacy timing to the new Required column for all new power supply designs. T3 minimum must not be faster than 100ms especially for previous generation motherboards and systems. -
Page 22: Ps_On# - Required
Electrical 3.3.3 PS_ON# – Required PS_ON# 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_ON# is pulled to TTL low, the power supply should turn on the four main DC output rails: +12 VDC, +5 VDC, +3.3 VDC, and -12 VDC. -
Page 23: 5Vsb - Required
Electrical Figure 3-4: PS_ON# Signal Characteristics 3.3.4 +5VSB – Required +5VSB is a standby supply output that is active whenever the AC power is present. This output 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, Alternative Sleep Modes (ASM) or suspend state activities. -
Page 24: Power-On Time - Required
Electrical Figure 3-5: +5VSB Power on Timing Versus VAC 3.3.5 Power-On Time – Required The power-on time is defined as the time from when PS_ON# is pulled low to when the +12 VDC, +5 VDC, and +3.3 VDC outputs are within the regulation ranges specified in Table 3-2. -
Page 25: Overshoot At Turn-On/Turn-Off - Required
Electrical Figure 3-6: Rise Time Characteristics 3.3.7 Overshoot at Turn-On/Turn-Off – Required The output voltage overshoot upon the application or removal of the input voltage, or the assertion/de-assertion of PS_ON#, under the conditions specified in Table 3-2, shall be less than 10% above the nominal voltage. No voltage of opposite polarity shall be present on any output during turn-on or turn-off. -
Page 26: 5Vsb Fall Time - Recommendation
Power supply 5VSB is recommended to go down to low level within 2 seconds under any load condition after AC power is removed as shown in Figure 3-7. Intel ® test plan will test at Light 20% Load. If system requires specific +5VSB fall time, the PSU design is recommended to support it. -
Page 27: Short Circuit Protection (Scp) - Required
Electrical 3.5.2 Short Circuit Protection (SCP) – Required 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 +3.3V DC, +5V DC, or +12V DC rails to return or any other rail. -
Page 28: Overall Power Supply Efficiency Levels
Electrical 3.5.8 Overall Power Supply Efficiency Levels The efficiency of the power supply should be tested at nominal input voltage of 115 VAC input and 230 VAC input, under the load conditions defined in the Generalized Test Protocol for Calculating the Energy Efficiency of Internal AC-DC and DC- DC Power Supplies document. -
Page 29: Table 3-14: Efficiency Versus Load For Energy Star
Electrical (details at the referenced CEC website below) are required to meet the efficiency target list in Table 3-15: Efficiency versus Load for CEC PC Computers with High Expandability Computers*. Visit ENERGY STAR* Computers Ver.8 website for more details. https://www.energystar.gov/products/spec/computers_version_8_0_pd Visit CEC* website for more details. -
Page 30: Mechanical
Mechanical Mechanical This chapter contains mechanical guidelines that apply to desktop power supplies regardless of form factor. For form factor specific design guides refer to Chapter 10 through Chapter Labeling and Marking - Recommended The following is a non-inclusive list of suggested markings for each power supply unit. Product regulation stipulations for sale into various geographies may impose additional labeling requirements. -
Page 31: Figure 4-1: Connectors (Pin-Side View, Not To Scale)
Mechanical 150 mm for all wire harnesses. Measurements are made from the exit port of the power supply case to the wire side of the first connector on the harness. Figure 4-1: Connectors (Pin-side View, Not to Scale) Note: Peripheral Connector is optional, does not show PCIe* Graphic Card Connector or 8 pin 12V2 connector. -
Page 32: Table 4-1: Main Power Connector Pin-Out
Mechanical Table 4-1: Main Power Connector Pin-Out Signal Color Signal Color +3.3V DC Orange +3.3V DC Orange [+3.3 V default [Brown] sense] +3.3V DC Orange -12V DC Blue Black Black +5V DC PS_ON# Green Black Black +5V DC Black Black Black PWR_OK Gray... -
Page 33: Table 4-3: Floppy Connector Pin-Out
Mechanical 4.2.2.3 Floppy Drive Connector – Do Not Include (For Historical Reference Only) Connector: AMP* 171822-4 or equivalent. Table 4-3: Floppy Connector Pin-Out Signal Color +5V DC Black Black +12V1 DC Yellow NOTE: 20 AWG wire. 4.2.2.4 PCI-Express* (PCIe*) Graphics Card Connector This is an optional connector for the power supply to support additional power needed by a discrete graphics card over 75 watts. -
Page 34: Table 4-6: +12 V Power 4 Pin Connector Pin-Out
Mechanical Contact: Molex* 44476-1112 (HCS) or equivalent (Mating motherboard connector is Molex* 39-29-9042 or equivalent). Table 4-6: +12 V Power 4 Pin Connector Pin-Out Signal Color Signal Color Black +12V2 DC Yellow Black +12V2 DC Yellow NOTE: 18 AWG wire. Table 4-7: +12 V Power 8 Pin Connector Pin-Out Signal Color... -
Page 35: Airflow And Fans - Recommended
Mechanical Table 4-8: Serial ATA* Power Connector Pin-Out Wire Signal Color +3.3V DC Orange Black +5V DC Black +12V1 DC Yellow NOTES: 18 AWG wire. +3.3V DC is removed from SATA V3.2 specification. But it is recommended if there is backward compatibility concern. -
Page 36: Fan Size And Speed
Mechanical 4.3.2 Fan Size and Speed A thermally sensitive fan speed control circuit is recommended to balance system-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 supply and system component temperatures within specification. -
Page 37: Acoustics
Acoustics Acoustics Acoustics – Recommended It is recommended that the power supply be designed with an appropriate fan, internal impedance, and fan speed control circuitry capable of meeting the acoustic targets listed in the below table. The power supply assembly should not produce and prominent discrete tone determined according to ISO 7779, Annex D. -
Page 38: Environmental
Environmental Environmental The following sections define environmental specifications and test parameters, based on the typical conditions to which a power supply may be subjected during operation or shipment. Temperature – Recommended Operating ambient +10 °C to +50 °C (At full load, with a maximum temperature •... -
Page 39: Mechanical Shock - Recommended
Environmental Mechanical Shock – Recommended Non-operating 50 g, trapezoidal input; velocity change ≥ 170 in/s • Three drops on each of six faces are applied to each sample. • Random Vibration – Recommended Non-operating 0.01 g²/Hz at 5 Hz, sloping to 0.02 g²/Hz at 20 Hz, and maintaining •... -
Page 40: Electromagnetic Compatibility
Electromagnetic Compatibility Electromagnetic Compatibility The following sections outline applicable product regulatory requirements for the power supplies. Additional requirements may apply dependent upon the design, product end use, target geography, and other variables. Emissions – Required The power supply shall comply with FCC Part 15, EN55023 and CISPR 22, 5th ed., meeting Class B for both conducted and radiated emissions with a 4 dB margin. -
Page 41: Magnetic Leakage Field - Required
Electromagnetic Compatibility Magnetic Leakage Field - Required A PFC choke magnetic leakage field must not cause any interference with a high- resolution computer monitor placed next to or on top of the end-use chassis. Voltage Fluctuations and 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 drawing not more than 16VAC, connected to low voltage... -
Page 42: Safety
Safety Safety The following sections outline sample product regulations requirements for a typical power supply. Actual requirements will depend on the design, product end use, target geography, and other variables. Consult the company’s Product Safety and Regulations department or an accredited third party certification agency for more details. North America –... -
Page 43: International - Required
Safety International – Required The vendor must provide a complete CB certificate and test report to IEC 60950-1. The CB report must include ALL CB member country national deviations as appropriate for the target market. All evaluations and certifications must be for reinforced insulation between primary and secondary circuits. -
Page 44: Reliability
Reliability – PS_ON# Toggle for S0ix Mode - Required In order to optimize desktop platform power consumption, Intel provides design recommendation to enable PSU PS_ON# toggle on/off during S0 idle power mode (S0ix) to save both system and PSU power. The PSU PS_ON# may toggle on/off every... -
Page 45: Cfx12V Specific Guidelines 1.63
CFX12V Specific Guidelines 1.63 CFX12V Specific Guidelines 1.63 For Compact Form Factor with 12-volt connector power supplies. All Form Factors Revision Summary: PSU DG CFX12V LFX12V ATX12V SFX12V TFX12V Flex ATX 1.31 1.42 1.62 1.42 2.52 3.42 2.52 1.22 1.43 1.63... -
Page 46: Lfx12V Specific Guidelines 1.43
LFX12V Specific Guidelines 1.43 LFX12V Specific Guidelines 1.43 For Low Profile Form Factor with 12-volt connector power supplies. All Form Factors Revision Summary: PSU DG CFX12V LFX12V ATX12V SFX12V TFX12V Flex ATX 1.31 1.42 1.62 1.42 2.52 3.42 2.52 1.22 1.43 1.63... -
Page 47: Figure 11-2: Mechanical Details
LFX12V Specific Guidelines 1.43 Figure 11-2: Mechanical Details Figure 11-3: PSU Slot Feature Detail Design Guide... -
Page 48: Figure 11-4: Recommended Chassis Tab Feature
LFX12V Specific Guidelines 1.43 Figure 11-4: Recommended Chassis Tab Feature § § Design Guide... -
Page 49: Atx12V Specific Guidelines 2.53
ATX12V Specific Guidelines 2.53 ATX12V Specific Guidelines 2.53 For ATX Form Factor with 12-volt connector power supplies. All Form Factors Revision Summary: PSU DG CFX12V LFX12V ATX12V SFX12V TFX12V Flex ATX 1.31 1.42 1.62 1.42 2.52 3.42 2.52 1.22 1.43 1.63... -
Page 50: Figure 12-2: Power Supply Dimensions For Chassis Requiring Top Venting
ATX12V Specific Guidelines 2.53 Figure 12-2: Power Supply Dimensions for Chassis Requiring Top Venting § § Design Guide... -
Page 51: Sfx12V Specific Guidelines 3.43
SFX12V Specific Guidelines 3.43 SFX12V Specific Guidelines 3.43 For Small Form Factor with 12-volt connector power supplies. All Form Factors Revision Summary: PSU DG CFX12V LFX12V ATX12V SFX12V TFX12V Flex ATX 1.31 1.42 1.62 1.42 2.52 3.42 2.52 1.22 1.43 1.63... -
Page 52: Figure 13-1: 40 Mm Profile Mechanical Outline
SFX12V Specific Guidelines 3.43 Figure 13-1: 40 mm Profile Mechanical Outline Figure 13-2: Chassis Cutout Design Guide... -
Page 53: Top Fan Mount Package - Physical Dimensions -Required
SFX12V Specific Guidelines 3.43 13.3 Top Fan Mount Package - Physical Dimensions - Required The power supply shall be enclosed and meet the physical outline shown in Figure 13-3. 13.4 Fan Requirements - Required The fan will draw air from the computer system cavity pressurizing the power supply enclosure. -
Page 54: Reduced Depth Top Mount Fan - Physical
SFX12V Specific Guidelines 3.43 Figure 13-4: Chassis Cutout Figure 13-5: Recessed Fan Mounting 13.5 Reduced Depth Top Mount Fan - Physical Dimensions - Required The power supply shall be enclosed and meet the physical outline shown in Figure 13-6. 13.6 Fan Requirements - Required The fan will draw air from the computer system cavity pressurizing the power supply enclosure. -
Page 55: Standard Sfx Profile Package - Physical Dimensions - Required
SFX12V Specific Guidelines 3.43 Figure 13-6: Reduced Depth Top Mount Fan Profile Mechanical Outline Figure 13-7: Chassis Cutout 13.7 Standard SFX Profile Package – Physical Dimensions - Required The power supply shall be enclosed and meet the physical outline shown in Figure 13-8. -
Page 56: Fan Requirements - Required
SFX12V Specific Guidelines 3.43 13.8 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 13-9. -
Page 57: Ps3 Form Factor- Physical Dimensions - Required
Fan Requirements - Required An 80 mm axial fan is typically needed to provide enough cooling airflow through a high performance Micro ATX system. Exact CFM requirements vary by application and endues environment, but 25-35 CFM is typical for the fan itself. -
Page 58: Figure 13-10: Ps3 Mechanical Outline
SFX12V Specific Guidelines 3.43 Figure 13-10: PS3 Mechanical Outline § § Design Guide... -
Page 59: Tfx12V Specific Guidelines 2.53
TFX12V Specific Guidelines 2.53 TFX12V Specific Guidelines 2.53 For Thin Form Factor with 12-volt connector power supplies. All Form Factors Revision Summary: PSU DG CFX12V LFX12V ATX12V SFX12V TFX12V Flex ATX 1.31 1.42 1.62 1.42 2.52 3.42 2.52 1.22 1.43 1.63... -
Page 60: Figure 14-2: Dimensions And Recommended Feature Placements (Not To Scale)
TFX12V Specific Guidelines 2.53 Figure 14-2: Dimensions and Recommended Feature Placements (Not to Scale) Design Guide... -
Page 61: Mounting Options - Recommended
TFX12V Specific Guidelines 2.53 Figure 14-3: Power Supply Mounting Slot Detail 14.2 Mounting Options - Recommended The TFX12V mechanical design provides two options for mounting in a system chassis. The 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. -
Page 62: Chassis Requirements - Recommended
TFX12V Specific Guidelines 2.53 Figure 14-4: Fan Right and Fan Left Orientations of Power Supply in a Chassis 14.3 Chassis Requirements - Recommended To ensure the power supply can be easily integrated, the following features should be designed into a chassis intended to use a TFX12V power supply: •... -
Page 63: Figure 14-6: Suggested Mounting Tab (Chassis Feature)
TFX12V Specific Guidelines 2.53 Figure 14-6: Suggested Mounting Tab (Chassis Feature) § § Design Guide... -
Page 64: Flex Atx Specific Guidelines 1.23
Flex ATX Specific Guidelines 1.23 Flex ATX Specific Guidelines 1.23 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 1.31 1.42 1.62 1.42 2.52 3.42 2.52... -
Page 65: Figure 15-2: Dimensions And Recommended Feature Placements (Not To Scale)
Flex ATX Specific Guidelines 1.23 Figure 15-2: Dimensions and Recommended Feature Placements (Not to Scale) § § Design Guide...