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Intel ATX12V manual Remote Sensing, Typical Power Distribution

Models: ATX12V

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ATX12V Power Supply Design Guide

Version 2.0

3.2.2. Remote Sensing

The +3.3 VDC output should have provisions for remote sensing to compensate for excessive cable drops. The default sense should be connected to pin 11 of the main power connector. The power supply should draw no more than 10 mA through the remote sense line to keep DC offset voltages to a minimum.

3.2.3. Typical Power Distribution

DC output power requirements and distributions will vary based on specific system options and implementation. Significant dependencies include the quantity and types of processors, memory, add-in card slots, and peripheral bays, as well as support for advanced graphics or other features. It is ultimately the responsibility of the designer to derive a power budget for a given target product and market.

Table 3 through Table 5 and Figure 1 through Figure 3 provide sample power distributions and a graphical recommendation for cross loading. It should not be inferred that all power supplies must conform to these tables, nor that a power supply designed to meet the information in the tables will work in all system configurations.

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Intel ATX12V manual Remote Sensing, Typical Power Distribution

Contents

ATX12V Power Supply Design Guide VersionIMPORTANT INFORMATION AND DISCLAIMERS Contents IntroductionApplicable Documents ElectricalSafety 4. Mechanical5. Environmental 6. Electromagnetic CompatibilityATX12V Power Supply Design Guide Version FiguresTables 1. Introduction 1.1. Scope1.2.1. Increased +12 VDC output capability 1.2.2. Minimum Efficiency1.2.3. Main Power Connector 1.2.4. Separate current limit for 12V2 on the 2x2 connector1.3 Terminology 2. Applicable Documents Document TitleDescription 3. Electrical 3.1. AC Input3.1.1. Input Over-current Protection 3.1.2. Inrush Current Limiting3.1.3. Input Under-voltage 3.1.4. RegulatoryPRODUCT SAFETY ELECTROMAGNETIC CAMPATIBILITY3.2. DC Output 3.1.5. Catastrophic Failure Protection3.2.1. DC Voltage Regulation 3.2.3. Typical Power Distribution 3.2.2. Remote Sensing3.2.3.1. ATX12V Configurations Table 3. Typical Power Distribution for a 250 W ATX12V ConfigurationFigure 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 ConfigurationTable 5. Typical Power Distribution for a 350 W ATX12V Configuration Figure 3. Cross Loading Graph for 350W ConfigurationTable 6. Typical Power Distribution for a 400 W ATX12V Configuration Figure 4. Cross Loading Graph for 400W Configuration3.2.4. Power Limit / Hazardous Energy Levels 3.2.5. Efficiency3.2.5.1. General Table 7. Minimum Efficiency Vs LoadATX12V Power Supply Design Guide Table 8. Loading Table for Efficiency Measurements3.2.6. Output Ripple/Noise Table 9. Energy Star Input Power Consumption3.2.5.3. Other Low Power System Requirements 3.2.5.2. Energy StarFigure 5. Differential Noise Test Setup Power SupplyTable 10. DC Output Noise/Ripple Scope3.2.7. Output Transient Response 3.2.8. Capacitive LoadTable 11. DC Output Transient Step Sizes Table 12. Output Capacitive Loads3.2.10. +5 VDC / +3.3 VDC Power Sequencing 3.3. Timing / Housekeeping / Control3.2.9. Closed-loop Stability 3.2.11. Voltage Hold-up Time3.3.1. PWROK 3.3.2. PSON#Table 13. PWROK Signal Characteristics 3.3.3. +5 VSB Table 14. PSON# Signal CharacteristicsFigure 7. PSON# Signal Characteristics 3.3.4. Power-on Time 3.3.7. Reset after Shutdown3.3.8. +5 VSB at AC Power-down 3.3.5. Risetime3.4. Output Protection 3.4.1. Over-voltage Protection3.4.2. Short-circuit Protection 3.4.3. No-load Operation3.4.5. Over-temperature Protection 3.4.6. Output Bypass4.2. Physical Dimensions 4. Mechanical4.1. Labeling / Marking Second optional fan may go in this location Air inlet grill, 55% open areaSecond optional fan may be locatedin optional venting area or on topside4.3. Airflow / Fan 4.4. AC Connector 4.5. DC ConnectorsMain Power Connector PSON#4.5.1. ATX Main Power Connector 4.5.2. +12 V Power Connector 4.5.3. Peripheral ConnectorsATX12V Power Supply Design Guide Version 4.5.4. Serial ATA Power Connector 4.5.5. Floppy Drive ConnectorThis is a required connector for systems with Serial ATA devices Figure 11. Serial ATA ConnectorTemperature EnvironmentalThermal Shock Shipping Humidity5.5. Mechanical Shock 5.6. Random Vibration5.7. Acoustics ATX12V Power Supply Design Guide Version 2.0 Final Review Copy6. Electromagnetic Compatibility 6.1. Emissions6.2. Immunity 6.3. Input Line Current Harmonic Content and Line Flicker 6.4. Magnetic Leakage FieldsTable 16. Harmonic Limits, Class D Equipment 7. Reliability 7.1. Component De-rating8. Safety 8.1. North America8.2. International 8.3. Proscribed Materials