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Intel ATX12V manual Over-temperature Protection, Output Bypass

Models: ATX12V

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ATX12V Power Supply Design Guide

Version 2.0

3.4.5. Over-temperature Protection

The power supply may include an over-temperature protection sensor, which can trip and shut down the power supply at a preset temperature point. Such an overheated condition is typically the result of internal current overloading or a cooling fan failure. If the protection circuit is nonlatching, then it should have hysteresis built in to avoid intermittent tripping.

3.4.6. Output Bypass

The output return may be connected to the power supply chassis. The return will be connected to the system chassis by the system components.

Page 27

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Intel ATX12V manual Over-temperature Protection, Output Bypass

Contents

Version ATX12V Power Supply Design GuideIMPORTANT INFORMATION AND DISCLAIMERS Electrical ContentsIntroduction Applicable Documents6. Electromagnetic Compatibility Safety4. Mechanical 5. EnvironmentalATX12V Power Supply Design Guide Version FiguresTables 1.2.2. Minimum Efficiency 1. Introduction1.1. Scope 1.2.1. Increased +12 VDC output capability1.2.3. Main Power Connector 1.2.4. Separate current limit for 12V2 on the 2x2 connector1.3 Terminology 2. Applicable Documents Document TitleDescription 3.1.2. Inrush Current Limiting 3. Electrical3.1. AC Input 3.1.1. Input Over-current ProtectionELECTROMAGNETIC CAMPATIBILITY 3.1.3. Input Under-voltage3.1.4. Regulatory PRODUCT SAFETY3.2. DC Output 3.1.5. Catastrophic Failure Protection3.2.1. DC Voltage Regulation 3.2.2. Remote Sensing 3.2.3. Typical Power Distribution3.2.3.1. ATX12V Configurations Table 3. Typical Power Distribution for a 250 W ATX12V ConfigurationFigure 1. Cross Loading Graph for 250W Configuration Figure 2. Cross Loading Graph for 300W Configuration Table 4. Typical Power Distribution for a 300 W ATX12V ConfigurationFigure 3. Cross Loading Graph for 350W Configuration Table 5. Typical Power Distribution for a 350 W ATX12V ConfigurationFigure 4. Cross Loading Graph for 400W Configuration Table 6. Typical Power Distribution for a 400 W ATX12V ConfigurationTable 7. Minimum Efficiency Vs Load 3.2.4. Power Limit / Hazardous Energy Levels3.2.5. Efficiency 3.2.5.1. GeneralTable 8. Loading Table for Efficiency Measurements ATX12V Power Supply Design Guide3.2.5.2. Energy Star 3.2.6. Output Ripple/NoiseTable 9. Energy Star Input Power Consumption 3.2.5.3. Other Low Power System RequirementsScope Figure 5. Differential Noise Test SetupPower Supply Table 10. DC Output Noise/RippleTable 12. Output Capacitive Loads 3.2.7. Output Transient Response3.2.8. Capacitive Load Table 11. DC Output Transient Step Sizes3.2.11. Voltage Hold-up Time 3.2.10. +5 VDC / +3.3 VDC Power Sequencing3.3. Timing / Housekeeping / Control 3.2.9. Closed-loop Stability3.3.1. PWROK 3.3.2. PSON#Table 13. PWROK Signal Characteristics 3.3.3. +5 VSB Table 14. PSON# Signal CharacteristicsFigure 7. PSON# Signal Characteristics 3.3.5. Risetime 3.3.4. Power-on Time3.3.7. Reset after Shutdown 3.3.8. +5 VSB at AC Power-down3.4.3. No-load Operation 3.4. Output Protection3.4.1. Over-voltage Protection 3.4.2. Short-circuit Protection3.4.6. Output Bypass 3.4.5. Over-temperature Protection4.2. Physical Dimensions 4. Mechanical4.1. Labeling / Marking Air inlet grill, 55% open area Second optional fan may go in this locationarea or on topside Second optionalfan may be located in optional venting4.3. Airflow / Fan 4.5. DC Connectors 4.4. AC ConnectorPSON# Main Power Connector4.5.1. ATX Main Power Connector 4.5.2. +12 V Power Connector 4.5.3. Peripheral ConnectorsATX12V Power Supply Design Guide Version Figure 11. Serial ATA Connector 4.5.4. Serial ATA Power Connector4.5.5. Floppy Drive Connector This is a required connector for systems with Serial ATA devicesHumidity TemperatureEnvironmental Thermal Shock ShippingATX12V Power Supply Design Guide Version 2.0 Final Review Copy 5.5. Mechanical Shock5.6. Random Vibration 5.7. Acoustics6. 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 7.1. Component De-rating 7. Reliability8.1. North America 8. Safety8.3. Proscribed Materials 8.2. International