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manual ATX12V Power Supply Design Guide, Version
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ATX12V
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PWROK Signal Characteristics
Dimension
ATX12V Configurations
Wire #s
Reset after Shutdown
Differential Noise Test Setup
Over-temperature Protection
Safety
ATX12V Power Supply Design Guide
Separate current limit for 12V2 on the 2x2 connector
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Image 1
ATX12V
Power Supply Design Guide
Version 2.0
Page 2
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Page 2
Contents
Version
ATX12V Power Supply Design Guide
IMPORTANT INFORMATION AND DISCLAIMERS
Introduction
Contents
Applicable Documents
Electrical
4. Mechanical
Safety
5. Environmental
6. Electromagnetic Compatibility
Figures
ATX12V Power Supply Design Guide Version
Tables
1.1. Scope
1. Introduction
1.2.1. Increased +12 VDC output capability
1.2.2. Minimum Efficiency
1.2.4. Separate current limit for 12V2 on the 2x2 connector
1.2.3. Main Power Connector
1.3 Terminology
Document Title
2. Applicable Documents
Description
3.1. AC Input
3. Electrical
3.1.1. Input Over-current Protection
3.1.2. Inrush Current Limiting
3.1.4. Regulatory
3.1.3. Input Under-voltage
PRODUCT SAFETY
ELECTROMAGNETIC CAMPATIBILITY
3.1.5. Catastrophic Failure Protection
3.2. DC Output
3.2.1. DC Voltage Regulation
3.2.2. Remote Sensing
3.2.3. Typical Power Distribution
Table 3. Typical Power Distribution for a 250 W ATX12V Configuration
3.2.3.1. ATX12V Configurations
Figure 1. Cross Loading Graph for 250W Configuration
Figure 2. Cross Loading Graph for 300W Configuration
Table 4. Typical Power Distribution for a 300 W ATX12V Configuration
Figure 3. Cross Loading Graph for 350W Configuration
Table 5. Typical Power Distribution for a 350 W ATX12V Configuration
Figure 4. Cross Loading Graph for 400W Configuration
Table 6. Typical Power Distribution for a 400 W ATX12V Configuration
3.2.5. Efficiency
3.2.4. Power Limit / Hazardous Energy Levels
3.2.5.1. General
Table 7. Minimum Efficiency Vs Load
Table 8. Loading Table for Efficiency Measurements
ATX12V Power Supply Design Guide
Table 9. Energy Star Input Power Consumption
3.2.6. Output Ripple/Noise
3.2.5.3. Other Low Power System Requirements
3.2.5.2. Energy Star
Power Supply
Figure 5. Differential Noise Test Setup
Table 10. DC Output Noise/Ripple
Scope
3.2.8. Capacitive Load
3.2.7. Output Transient Response
Table 11. DC Output Transient Step Sizes
Table 12. Output Capacitive Loads
3.3. Timing / Housekeeping / Control
3.2.10. +5 VDC / +3.3 VDC Power Sequencing
3.2.9. Closed-loop Stability
3.2.11. Voltage Hold-up Time
3.3.2. PSON#
3.3.1. PWROK
Table 13. PWROK Signal Characteristics
Table 14. PSON# Signal Characteristics
3.3.3. +5 VSB
Figure 7. PSON# Signal Characteristics
3.3.7. Reset after Shutdown
3.3.4. Power-on Time
3.3.8. +5 VSB at AC Power-down
3.3.5. Risetime
3.4.1. Over-voltage Protection
3.4. Output Protection
3.4.2. Short-circuit Protection
3.4.3. No-load Operation
3.4.6. Output Bypass
3.4.5. Over-temperature Protection
4. Mechanical
4.2. Physical Dimensions
4.1. Labeling / Marking
Air inlet grill, 55% open area
Second optional fan may go in this location
fan may be located
Second optional
in optional venting
area or on topside
4.3. Airflow / Fan
4.5. DC Connectors
4.4. AC Connector
PSON#
Main Power Connector
4.5.1. ATX Main Power Connector
4.5.3. Peripheral Connectors
4.5.2. +12 V Power Connector
ATX12V Power Supply Design Guide Version
4.5.5. Floppy Drive Connector
4.5.4. Serial ATA Power Connector
This is a required connector for systems with Serial ATA devices
Figure 11. Serial ATA Connector
Environmental
Temperature
Thermal Shock Shipping
Humidity
5.6. Random Vibration
5.5. Mechanical Shock
5.7. Acoustics
ATX12V Power Supply Design Guide Version 2.0 Final Review Copy
6.1. Emissions
6. Electromagnetic Compatibility
6.2. Immunity
6.4. Magnetic Leakage Fields
6.3. Input Line Current Harmonic Content and Line Flicker
Table 16. Harmonic Limits, Class D Equipment
7.1. Component De-rating
7. Reliability
8.1. North America
8. Safety
8.3. Proscribed Materials
8.2. International
