Intel ATX12V User Manual

ATX12V Power Supply Design Guide Version 2.0

ATX12V Power Supply Design Guide Version 2.0 103.1.3. Input Under-voltage The power supply shall contain protection circuitry such that the applic

ATX12V Power Supply Design Guide Version 2.0 11 3.1.5. Catastrophic Failure Protection Should a component failure occur, the power supply should

ATX12V Power Supply Design Guide Version 2.0 123.2.2. Remote Sensing The +3.3 VDC output should have provisions for remote sensing to compensate f

ATX12V Power Supply Design Guide Version 2.0 133.2.3.1. ATX12V Configurations Table 3. Typical Power Distribution for a 250 W ATX12V Configura

ATX12V Power Supply Design Guide Version 2.0 14Table 4. Typical Power Distribution for a 300 W ATX12V Configuration Output Min. Current (amps) M

ATX12V Power Supply Design Guide Version 2.0 15Table 5. Typical Power Distribution for a 350 W ATX12V Configuration Output Min. Current (amps)

ATX12V Power Supply Design Guide Version 2.0 16Table 6. Typical Power Distribution for a 400 W ATX12V Configuration Output Min. Current (amps) M

ATX12V Power Supply Design Guide Version 2.0 173.2.4. Power Limit / Hazardous Energy Levels Under normal or overload conditions, no output shall

ATX12V Power Supply Design Guide Version 2.0 18Table 8. Loading Table for Efficiency Measurements 250W (loading shown in Amps) Loading +12V1

ATX12V Power Supply Design Guide Version 2.0 193.2.5.2. Energy Star* The “Energy Star” efficiency requirements of the power supply depend on the

ATX12V Power Supply Design Guide Version 2.0 2 IMPORTANT INFORMATION AND DISCLAIMERS INTEL CORPORATION (AND ANY CONTRIBUTOR) IS PROVIDING THIS INFORM

ATX12V Power Supply Design Guide Version 2.0 20Table 10. DC Output Noise/Ripple Output Max. Ripple & Noise (mVpp) +12 V1DC 120 +12 V2DC 20

ATX12V Power Supply Design Guide Version 2.0 21 3.2.7. Output Transient Response Table 11 summarizes the expected output transient step sizes for

ATX12V Power Supply Design Guide Version 2.0 223.2.9. Closed-loop Stability The power supply shall be unconditionally stable under all line/load/t

ATX12V Power Supply Design Guide Version 2.0 233.3.1. PWR_OK PWR_OK is a “power good” signal. It should be asserted high by the power supply to

ATX12V Power Supply Design Guide Version 2.0 24Table 14. PS_ON# Signal Characteristics Min. Max. VIL, Input Low Voltage 0.0 V 0.8 V IIL, Input L

ATX12V Power Supply Design Guide Version 2.0 253.3.4. Power-on Time The power-on time is defined as the time from when PS_ON# is pulled low to wh

ATX12V Power Supply Design Guide Version 2.0 263.4. Output Protection 3.4.1. Over-voltage Protection The over-voltage sense circuitry and refere

ATX12V Power Supply Design Guide Version 2.0 273.4.5. Over-temperature Protection The power supply may include an over-temperature protection sen

ATX12V Power Supply Design Guide Version 2.0 284. Mechanical 4.1. Labeling / Marking The following is a non-inclusive list of suggested markings

ATX12V Power Supply Design Guide Version 2.0 29. 3. Tolerances: X +/- 1 X.X +/- 0.54. If a wire grill is required for acoustics or therma

ATX12V Power Supply Design Guide Version 2.0 3 Contents 1. Introduction ...

ATX12V Power Supply Design Guide Version 2.0 30. 53 REFWIRE HARNESS16 REF150 REF20.0(2X)4.0X694.011.0 x 5.0 cutouts (4X);min 6.0 clearance undercuto

ATX12V Power Supply Design Guide Version 2.0 314.3. Airflow / Fan The ATX Specification allows for numerous (and often confusing) possibilities f

ATX12V Power Supply Design Guide Version 2.0 32The ATX Specification offers two options for venting between the power supply and the system interior

ATX12V Power Supply Design Guide Version 2.0 33 Figure 10. ATX12V Power Supply Connectors (Pin-side view, not to scale) 1 1+3.3 +3.3 +3.3 - 12V

ATX12V Power Supply Design Guide Version 2.0 34 4.5.1. ATX Main Power Connector Connector: MOLEX* housing: 24 Pin Molex Mini-Fit Jr. PN# 39-01-2

ATX12V Power Supply Design Guide Version 2.0 354.5.2. +12 V Power Connector Connector: MOLEX 39-01-2040 or equivalent (Mating motherboard conne

ATX12V Power Supply Design Guide Version 2.0 364.5.4. Serial ATA Power Connector This is a required connector for systems with Serial ATA devices.

ATX12V Power Supply Design Guide Version 2.0 37 5. Environmental The following subsections define recommended environmental specifications and test

ATX12V Power Supply Design Guide Version 2.0 Final Review Copy 38 5.5. Mechanical Shock Non-operating 50 g, trapezoidal input; velocity change ≥

ATX12V Power Supply Design Guide Version 2.0 Final Review Copy 39 6. Electromagnetic Compatibility The following subsections outline sample produ

ATX12V Power Supply Design Guide Version 2.0 43.4.3. No-load Operation ...

ATX12V Power Supply Design Guide Version 2.0 Final Review Copy 40 6.3. Input Line Current Harmonic Content and Line Flicker For sales in EU (Europ

ATX12V Power Supply Design Guide Version 2.0 Final Review Copy 41 7. Reliability 7.1. Component De-rating The de-rating process promotes quali

ATX12V Power Supply Design Guide Version 2.0 Final Review Copy 42 8. Safety The following subsections outline sample product regulations requiremen

ATX12V Power Supply Design Guide Version 2.0 Final Review Copy 43 8.2. International The vendor must provide a complete CB certificate and test r

ATX12V Power Supply Design Guide Version 2.0 5Figures Figure 1. Cross Loading Graph for 250W Configuration ...

ATX12V Power Supply Design Guide Version 2.0 61. Introduction 1.1. Scope This document provides design suggestions and reference specifications

ATX12V Power Supply Design Guide Version 2.0 71.2.3. Main Power Connector: The 2 x 10 main power connector has been replaced by a 2 x 12 connec

ATX12V Power Supply Design Guide Version 2.0 82. Applicable Documents The following documents support this design guide as additional reference ma

ATX12V Power Supply Design Guide Version 2.0 93. Electrical The electrical requirements that follow are to be met over the environmental ranges s