ATX12VO (12V Only) Desktop Power Supply
Design Guide
ID
613768
Date
01/03/2022
Public
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Introduction
Processor Configurations
PCI Express* Add-in Card Considerations
Electrical
Mechanical
Acoustics
Environmental
Electromagnetic Compatibility
Safety
Reliability
CFX12V Specific Guidelines 2.0
LFX12V Specific Guidelines 2.0
ATX12V Specific Guidelines 3.0
SFX12V Specific Guidelines 4.0
TFX12V Specific Guidelines 3.0
Flex ATX Specific Guidelines 2.0
DC Output (Required)
DC Voltage Regulation (Required)
DC Output Current (Required)
Remote Sensing (Optional)
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)
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 PC Computers with High Expandability Score (Recommended)
SFX12V Specific Guidelines 4.0
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)
DC Voltage Regulation (Required)
The DC output voltages are required to remain within the regulation ranges shown in the Table 4-2, when measured at the load end of the output connectors under all line, load, and environmental conditions specified in Chapter 7.
The lower voltage range for +12V is allowed to be -7% to allow for the power excursion requirements now described in Section 3.1. To compensate for these power excursions the nominal voltage could be changed to 12.1 or 12.2 Volts, depending on Power Supply design.
Table 4-2: DC Output Voltage Regulation
Output | Range | Min | Nominal | Max | Unit |
+12V1DC1 | +5% / -7% | +11.20 | +12.00 | +12.60 | V |
+12V2DC2 | +5% / -7% | +11.20 | +12.00 | +12.60 | V |
+12VSB | +5% / -7% | +11.20 | +12.00 | +12.60 | V |
- Voltage tolerance is required at all connectors