Intel ATX12V User Manuals

Table of Contents

• ATX12V Power Supply Design Guide

  1
• Disclaimer

  2
• Contents

  3
• 1. Introduction

  6
  • 1.1. Scope

    6
  • 1.2. Key Changes for ATX12V Version 2.0 as Compared with ATX Power Supply

    6
    • 1.2.1. Increased +12 VDC output capability

      6
    • 1.2.2. Minimum Efficiency

      6
    • 1.2.3. Main Power Connector:

      7
    • 1.2.4. Separate current limit for 12V2 on the 2x2 connector:

      7
  • 1.3 Terminology

    7
• 2. Applicable Documents

  8
• 3. Electrical

  9
  • 3.1. AC Input

    9
    • 3.1.1. Input Over-current Protection

      9
    • 3.1.2. Inrush Current Limiting

      9
    • 3.1.3. Input Under-voltage

      10
    • 3.1.4. Regulatory

      10
    • 3.1.5. Catastrophic Failure Protection

      11
  • 3.2. DC Output

    11
    • 3.2.1. DC Voltage Regulation

      11
    • 3.2.2. Remote Sensing

      12
    • 3.2.3. Typical Power Distribution

      12
    • 3.2.4. Power Limit / Hazardous Energy Levels

      17
    • 3.2.5. Efficiency

      17
    • 3.2.6. Output Ripple/Noise

      19
    • 3.2.7. Output Transient Response

      21
    • 3.2.8. Capacitive Load

      21
    • 3.2.9. Closed-loop Stability

      22
    • 3.2.10. +5 VDC / +3.3 VDC Power Sequencing

      22
    • 3.2.11. Voltage Hold-up Time

      22
  • 3.3. Timing / Housekeeping / Control

    22
    • 3.3.1. PWR_OK

      23
    • 3.3.2. PS_ON#

      23
    • 3.3.3. +5 VSB

      24
    • 3.3.4. Power-on Time

      25
    • 3.3.5. Risetime

      25
    • 3.3.6. Overshoot at Turn-on / Turn-off

      25
    • 3.3.7. Reset after Shutdown

      25
    • 3.3.8. +5 VSB at AC Power-down

      25
  • 3.4. Output Protection

    26
    • 3.4.1. Over-voltage Protection

      26
    • 3.4.2. Short-circuit Protection

      26
    • 3.4.3. No-load Operation

      26
    • 3.4.4. Over-current Protection

      26
    • 3.4.5. Over-temperature Protection

      27
    • 3.4.6. Output Bypass

      27
• 4. Mechanical

  28
  • 4.1. Labeling / Marking

    28
  • 4.2. Physical Dimensions

    28
  • 4.3. Airflow / Fan

    31
  • 4.4. AC Connector

    32
  • 4.5. DC Connectors

    32
    • 4.5.1. ATX Main Power Connector

      34
    • 4.5.2. +12 V Power Connector

      35
    • 4.5.3. Peripheral Connector(s)

      35
    • 4.5.4. Serial ATA Power Connector

      36
    • 4.5.5. Floppy Drive Connector

      36
• 5. Environmental

  37
  • 5.1. Temperature

    37
  • 5.2. Thermal Shock (Shipping)

    37
  • 5.3. Humidity

    37
  • 5.4. Altitude

    37
  • 5.5. Mechanical Shock

    38
  • 5.6. Random Vibration

    38
  • 5.7. Acoustics

    38
• 6. Electromagnetic Compatibility

  39
  • 6.1. Emissions

    39
  • 6.2. Immunity

    39
  • 6.3. Input Line Current Harmonic Content and Line Flicker

    40
  • 6.4. Magnetic Leakage Fields

    40
• 7. Reliability

  41
  • 7.1. Component De-rating

    41
• 8. Safety

  42
  • 8.1. North America

    42
  • 8.2. International

    43
  • 8.3. Proscribed Materials

    43