User ManualTable of ContentsATX12V Power Supply Design Guide1Disclaimer2Contents31. Introduction61.1. Scope61.2. Key Changes for ATX12V Version 2.0 as Compared with ATX Power Supply61.2.1. Increased +12 VDC output capability61.2.2. Minimum Efficiency61.2.3. Main Power Connector:71.2.4. Separate current limit for 12V2 on the 2x2 connector:71.3 Terminology72. Applicable Documents83. Electrical93.1. AC Input93.1.1. Input Over-current Protection93.1.2. Inrush Current Limiting93.1.3. Input Under-voltage103.1.4. Regulatory103.1.5. Catastrophic Failure Protection113.2. DC Output113.2.1. DC Voltage Regulation113.2.2. Remote Sensing123.2.3. Typical Power Distribution123.2.4. Power Limit / Hazardous Energy Levels173.2.5. Efficiency173.2.6. Output Ripple/Noise193.2.7. Output Transient Response213.2.8. Capacitive Load213.2.9. Closed-loop Stability223.2.10. +5 VDC / +3.3 VDC Power Sequencing223.2.11. Voltage Hold-up Time223.3. Timing / Housekeeping / Control223.3.1. PWR_OK233.3.2. PS_ON#233.3.3. +5 VSB243.3.4. Power-on Time253.3.5. Risetime253.3.6. Overshoot at Turn-on / Turn-off253.3.7. Reset after Shutdown253.3.8. +5 VSB at AC Power-down253.4. Output Protection263.4.1. Over-voltage Protection263.4.2. Short-circuit Protection263.4.3. No-load Operation263.4.4. Over-current Protection263.4.5. Over-temperature Protection273.4.6. Output Bypass274. Mechanical284.1. Labeling / Marking284.2. Physical Dimensions284.3. Airflow / Fan314.4. AC Connector324.5. DC Connectors324.5.1. ATX Main Power Connector344.5.2. +12 V Power Connector354.5.3. Peripheral Connector(s)354.5.4. Serial ATA Power Connector364.5.5. Floppy Drive Connector365. Environmental375.1. Temperature375.2. Thermal Shock (Shipping)375.3. Humidity375.4. Altitude375.5. Mechanical Shock385.6. Random Vibration385.7. Acoustics386. Electromagnetic Compatibility396.1. Emissions396.2. Immunity396.3. Input Line Current Harmonic Content and Line Flicker406.4. Magnetic Leakage Fields407. Reliability417.1. Component De-rating418. Safety428.1. North America428.2. International438.3. Proscribed Materials43Size: 420 KBPages: 43Language: EnglishOpen manual