ATX12VO (12V Only) Desktop Power Supply

Design Guide

ID 613768
Date 11/01/2023
Public

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Document Table of Contents
Document Table of Contents
Legal Introduction Processor Configurations PCI Express* Add-in Card Considerations Electrical Mechanical Acoustics Environmental Electromagnetic Compatibility Safety Reliability CFX12V Specific Guidelines 2.1 LFX12V Specific Guidelines 2.1 ATX12V Specific Guidelines 3.1 SFX12V Specific Guidelines 4.1 TFX12V Specific Guidelines 3.1 Flex ATX Specific Guidelines 2.1
Legal
Introduction
Introduction Power Supplies and Alternative Low Power Mode System Power Telemetry Feature Reference Documentation Terminology
Power Supplies and Alternative Low Power Mode
System Power Telemetry Feature
Reference Documentation
Terminology
Processor Configurations
Processor Configurations - RECOMMENDED High End Desktop Market Processor Considerations
Processor Configurations - RECOMMENDED
High End Desktop Market Processor Considerations
High End Desktop Market Processor Considerations Modular Power Supply Connectors Overclocking Recommendations
Modular Power Supply Connectors
Overclocking Recommendations
PCI Express* Add-in Card Considerations
PCI Express* Add-in Card Considerations PCIe* Add-in Card Power Excursions PCIe* AIC Auxiliary Power Connectors PCIe* Add-in Card 12V-2x6 Auxiliary Power Connector Sideband Signals
PCIe* Add-in Card Power Excursions
PCIe* Add-in Card Power Excursions PCIe* Add-in Card and PSU Power Budgets PSU Power Excursion
PCIe* Add-in Card and PSU Power Budgets
PSU Power Excursion
PCIe* AIC Auxiliary Power Connectors
PCIe* Add-in Card 12V-2x6 Auxiliary Power Connector Sideband Signals
PCIe* Add-in Card 12V-2x6 Auxiliary Power Connector Sideband Signals SENSE0 / SENSE1 (Required) CARD_PWR_STABLE (Optional) CARD_CBL_PRES# (Optional in Power Supply) Sideband Signals DC Specifications (Required)
SENSE0 / SENSE1 (Required)
CARD_PWR_STABLE (Optional)
CARD_CBL_PRES# (Optional in Power Supply)
Sideband Signals DC Specifications (Required)
Electrical
Electrical AC Input – REQUIRED DC Output – REQUIRED Timing, Housekeeping, and Control – REQUIRED Reset After Shutdown Output Protection
AC Input – REQUIRED
AC Input – REQUIRED Input Over Current Protection – REQUIRED Inrush Current – REQUIRED Input Under Voltage – REQUIRED
Input Over Current Protection – REQUIRED
Inrush Current – REQUIRED
Input Under Voltage – REQUIRED
DC Output – REQUIRED
DC Output – REQUIRED DC Voltage Regulation – REQUIRED DC Output Current – REQUIRED Remote Sensing – RECOMMENDED Other Low Power System Requirements – REQUIRED Output Ripple Noise – REQUIRED Capacitive Load – RECOMMENDED Closed Loop Stability – REQUIRED Multiple 12V Rail Power Sequencing – REQUIRED Voltage Hold-Up Time – REQUIRED/RECOMMENDED
DC Voltage Regulation – REQUIRED
DC Output Current – REQUIRED
Remote Sensing – RECOMMENDED
Other Low Power System Requirements – REQUIRED
Output Ripple Noise – REQUIRED
Capacitive Load – RECOMMENDED
Closed Loop Stability – REQUIRED
Multiple 12V Rail Power Sequencing – REQUIRED
Voltage Hold-Up Time – REQUIRED/RECOMMENDED
Timing, Housekeeping, and Control – REQUIRED
Timing, Housekeeping, and Control – REQUIRED PWR_OK - REQUIRED PS_ON# - REQUIRED +12VSB – REQUIRED Power-On Time – REQUIRED Rise Time – REQUIRED Overshoot at Turn-On / Turn-Off – REQUIRED I_PSU% Signal – REQUIRED
PWR_OK - REQUIRED
PS_ON# - REQUIRED
+12VSB – REQUIRED
Power-On Time – REQUIRED
Rise Time – REQUIRED
Overshoot at Turn-On / Turn-Off – REQUIRED
I_PSU% Signal – REQUIRED
Reset After Shutdown
Reset After Shutdown +12VSB at Power-Down – REQUIRED +12VSB Fall Time – RECOMMENDED
+12VSB at Power-Down – REQUIRED
+12VSB Fall Time – RECOMMENDED
Output Protection
Over Voltage Protection (OVP) - REQUIRED Short Circuit Protection (SCP) - REQUIRED No-Load Situation - REQUIRED Over Current Protection (OCP) - REQUIRED Over Temperature Protection (OTP) - REQUIRED Output Bypass - REQUIRED Separate Current Limit for 12V2 - OPTIONAL Overall Power Supply Efficiency Levels Power Supply Efficiency for Energy Regulations – ENERGY STAR* and CEC (California Energy Commission) PC Computers with High Expandability Score – RECOMMENDED
Over Voltage Protection (OVP) - REQUIRED
Short Circuit Protection (SCP) - REQUIRED
No-Load Situation - REQUIRED
Over Current Protection (OCP) - REQUIRED
Over Temperature Protection (OTP) - REQUIRED
Output Bypass - REQUIRED
Separate Current Limit for 12V2 - OPTIONAL
Overall Power Supply Efficiency Levels
Power Supply Efficiency for Energy Regulations – ENERGY STAR* and CEC (California Energy Commission) PC Computers with High Expandability Score – RECOMMENDED
Mechanical
Mechanical Labeling and Marking - RECOMMENDED Connectors (Required) Connector from Motherboard to Storage Devices – Reference Airflow and Fans (Recommended)
Labeling and Marking - RECOMMENDED
Connectors (Required)
AC Connector DC Connectors
AC Connector
DC Connectors
Connector from Motherboard to Storage Devices – Reference
Connector from Motherboard to Storage Devices – Reference Motherboard Connector Serial ATA Connectors (Reference)
Motherboard Connector
Serial ATA Connectors (Reference)
Airflow and Fans (Recommended)
Airflow and Fans (Recommended) Fan Location and Direction Fan Size and Speed Venting
Fan Location and Direction
Fan Size and Speed
Venting
Acoustics
Environmental
Environmental Temperature (Recommended) Thermal Shock (Shipping) Humidity (Recommended) Altitude (Recommended) Mechanical Shock (Recommended) Random Vibration (Recommended)
Temperature (Recommended)
Thermal Shock (Shipping)
Humidity (Recommended)
Altitude (Recommended)
Mechanical Shock (Recommended)
Random Vibration (Recommended)
Electromagnetic Compatibility
Electromagnetic Compatibility Emissions (Required) Immunity (Required) Input Line Current Harmonic Content (Optional) Magnetic Leakage Field (Required) Voltage Fluctuations and Flicker (Required)
Emissions (Required)
Immunity (Required)
Input Line Current Harmonic Content (Optional)
Magnetic Leakage Field (Required)
Voltage Fluctuations and Flicker (Required)
Safety
Safety North America (Required) International (Required) Proscribed Materials (Required) Catastrophic Failure Protection (Recommended)
North America (Required)
International (Required)
Proscribed Materials (Required)
Catastrophic Failure Protection (Recommended)
Reliability
Reliability (Recommended) Reliability – PS_ON# Toggle for S0ix Mode (Required)
Reliability (Recommended)
Reliability – PS_ON# Toggle for S0ix Mode (Required)
CFX12V Specific Guidelines 2.1
CFX12V Specific Guidelines 2.1 Physical Dimensions (Required)
Physical Dimensions (Required)
LFX12V Specific Guidelines 2.1
LFX12V Specific Guidelines 2.1 Physical Dimensions (Required)
Physical Dimensions (Required)
ATX12V Specific Guidelines 3.1
SFX12V Specific Guidelines 4.1
SFX12V Specific Guidelines 4.1 Lower Profile Package – Physical Dimensions (Required) Fan Requirements (Required) Top Fan Mount Package – Physical Dimensions (Required) Fan Requirements (Required) Reduced Depth Top Mount Fan – Physical Dimensions (Required) Fan Requirements (Required) Standard SFX Profile Package – Physical Dimensions (Required) Fan Requirements (Required) PS3 Form Factor – Physical Dimensions (Required) Fan Requirements (Required)
Lower Profile Package – Physical Dimensions (Required)
Fan Requirements (Required)
Top Fan Mount Package – Physical Dimensions (Required)
Fan Requirements (Required)
Reduced Depth Top Mount Fan – Physical Dimensions (Required)
Fan Requirements (Required)
Standard SFX Profile Package – Physical Dimensions (Required)
Fan Requirements (Required)
PS3 Form Factor – Physical Dimensions (Required)
Fan Requirements (Required)
TFX12V Specific Guidelines 3.1
TFX12V Specific Guidelines 3.1 Physical Dimensions (Required) Mounting Options (Recommended) Chassis Requirements (Recommended)
Physical Dimensions (Required)
Mounting Options (Recommended)
Chassis Requirements (Recommended)
Flex ATX Specific Guidelines 2.1
Flex ATX Specific Guidelines 2.1 Physical Dimensions (Required)
Physical Dimensions (Required)
Legal
Introduction
Processor Configurations
PCI Express* Add-in Card Considerations
Electrical
Mechanical
Acoustics
Environmental
Electromagnetic Compatibility
Safety
Reliability
CFX12V Specific Guidelines 2.1
LFX12V Specific Guidelines 2.1
ATX12V Specific Guidelines 3.1
SFX12V Specific Guidelines 4.1
TFX12V Specific Guidelines 3.1
Flex ATX Specific Guidelines 2.1

Separate Current Limit for 12V2 - OPTIONAL

The 12 V rail on the 2x2 power connector should be a separate current limited output to meet the requirements of UL and EN 62368-1. This only applies if the PSU is complying a 240VA Energy Hazard Safety Requirement; most power supplies are not currently designed to meet this requirement.

Overall Power Supply Efficiency Levels