Intel ATX12V manual Over-temperature Protection, Output Bypass

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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.

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Contents Version ATX12VImportant Information and Disclaimers Contents Electromagnetic Compatibility SafetyMechanical EnvironmentalTables FiguresMinimum Efficiency IntroductionScope Increased +12 VDC output capabilityMain Power Connector Separate current limit for 12V2 on the 2x2 connectorTerminology Applicable Documents Document TitleDescription Inrush Current Limiting ElectricalAC Input Input Over-current ProtectionInput Under-voltage RegulatoryOther Certifications and/or Declarations DC Output Voltage Regulation DC OutputCatastrophic Failure Protection DC Voltage RegulationRemote Sensing Typical Power DistributionCurrent Output Amps Power12V power watts Min MaxCross Loading Graph for 300W Configuration Typical Power Distribution for a 300 W ATX12V ConfigurationCross Loading Graph for 350W Configuration Typical Power Distribution for a 350 W ATX12V ConfigurationMin Max Peak Current Output Amps Typical Power Distribution for a 400 W ATX12V ConfigurationMinimum Efficiency Vs Load Power Limit / Hazardous Energy LevelsEfficiency GeneralLoading Table for Efficiency Measurements Energy Star Energy Star Input Power ConsumptionOther Low Power System Requirements Output Ripple/NoiseMax. Ripple & Noise MVpp DC Output Noise/RippleOutput Capacitive Loads Output Transient ResponseCapacitive Load DC Output Transient Step SizesVoltage Hold-up Time 10. +5 VDC / +3.3 VDC Power SequencingTiming / Housekeeping / Control Closed-loop StabilityPwrok Signal Characteristics PwrokPSON# 3. +5 VSB PSON# Signal CharacteristicsRisetime Power-on TimeReset after Shutdown 8. +5 VSB at AC Power-downNo-load Operation Output ProtectionOver-voltage Protection Short-circuit ProtectionOutput Bypass Over-temperature ProtectionPhysical Dimensions MechanicalLabeling / Marking Second optional fan may go in this location Second optional Airflow / Fan DC Connectors AC Connector+33V 12V +5V+12V1 +5V Pin Signal Color ATX Main Power ConnectorPin Signal AWG Wire 2. +12 V Power ConnectorPeripheral Connectors Connector Molex 39-01-2040 or equivalentConnector AMP 171822-4 or equivalent Pin Signal AWG Wire Serial ATA Power ConnectorFloppy Drive Connector Wire SignalHumidity TemperatureEnvironmental Thermal Shock ShippingMechanical Shock Random VibrationAcoustics Electromagnetic Compatibility EmissionsImmunity Input Line Current Harmonic Content and Line Flicker Magnetic Leakage FieldsHarmonic Limits, Class D Equipment Component De-rating ReliabilityNorth America SafetyProscribed Materials International