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ATX12V manual
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Contents
Main
Page
Contents
Page
Page
1. Introduction
1.1. Scope
1.2. Key Changes for ATX12V Version 2.0 as Compared with ATX Power Supply
1.2.1. Increased +12 VDC output capability
1.2.2. Minimum Efficiency
1.3 Terminology
2. Applicable Documents
The following documents support this design guide as additional reference material.
3. Electrical
3.1. AC Input
3.1.1. Input Over-current Protection
3.1.2. Inrush Current Limiting
3.1.3. Input Under-voltage
3.1.4. Regulatory
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
Figure 1. Cross Loading Graph for 250W Configuration
Table 4. Typical Power Distribution for a 300 W ATX12V Configuration
Figure 2. Cross Loading Graph for 300W Configuration
Table 5. Typical Power Distribution for a 350 W ATX12V Configuration
Figure 3. Cross Loading Graph for 350W Configuration
Table 6. Typical Power Distribution for a 400 W ATX12V Configuration
Figure 4. Cross Loading Graph for 400W Configuration
3.2.4. Power Limit / Hazardous Energy Levels
3.2.5. Efficiency
Table 8. Loading Table for Efficiency Measurements
3.2.6. Output Ripple/Noise
Table 10. DC Output Noise/Ripple
Scope
Figure 5. Differential Noise Test Setup
3.2.7. Output Transient Response
3.2.8. Capacitive Load
3.2.9. Closed-loop Stability
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3.2.10. +5 VDC / +3.3 VDC Power Sequencing
3.2.11. Voltage Hold-up Time
3.3. Timing / Housekeeping / Control
3.3.1. PWR_OK
3.3.2. PS_ON#
3.3.3. +5 VSB
3.3.4. Power-on Time
3.3.5. Risetime
3.3.6. Overshoot at Turn-on / Turn-off
3.3.7. Reset after Shutdown
3.3.8. +5 VSB at AC Power-down
3.4. Output Protection
3.4.1. Over-voltage Protection
3.4.2. Short-circuit Protection
3.4.3. No-load Operation
3.4.4. Over-current Protection
Page
4. Mechanical
4.1. Labeling / Marking
4.2. Physical Dimensions
Air inlet grill, 55% open area.
Figure 8. Power Supply Dimensions for Chassis That Does Not Require Top Venting
Second optional fan may go in this location
Version 2.0
30
Figure 9. Power Supply Dimensions for Chassis That Require Top Venting
Optional Venting Area
Second optional fan may be located in optional venting area or on topside.
4.3. Airflow / Fan
4.4. AC Connector
4.5. DC Connectors
Page
ATX12V Power Supply Design Guide
4.5.1. ATX Main Power Connector
equivalent
4.5.2. +12 V Power Connector
4.5.3. Peripheral Connector(s)
4.5.4. Serial ATA Power Connector
4.5.5. Floppy Drive Connector
5. Environmental
5.1. Temperature
5.2. Thermal Shock (Shipping)
5.3. Humidity
5.4. Altitude
5.5. Mechanical Shock
5.6. Random Vibration
5.7. Acoustics
6. Electromagnetic Compatibility
6.1. Emissions
6.2. Immunity
6.3. Input Line Current Harmonic Content and Line Flicker
6.4. Magnetic Leakage Fields
7. Reliability
7.1. Component De-rating
8. Safety
8.1. North America