Intel ERP2U manual Protection Circuits, Current Limit, 240VA Protection, Over Current Protection

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SSI

ERP2U Power Supply Design Guide, V1.0

7Protection Circuits

STATUS

Required

Protection circuits inside the power supply shall cause only the power supply’s main outputs to shutdown. If the power supply latches off due to a protection circuit tripping, an AC cycle OFF for 15 s and a PSON# cycle HIGH for 1 s must be able to reset the power supply.

7.1Current Limit

STATUS

Required

The power supply shall have current limit to prevent the +3.3 V, +5 V, and +12 V outputs from exceeding the values shown in Table 20. If the current limits are exceeded, the power supply shall shutdown and latch off. The latch will be cleared by toggling the PSON# signal or by an AC power interruption. The power supply shall not be damaged from repeated power cycling in this condition. -12 V and 5 VSB shall be protected under over current or shorted conditions so that no damage can occur to the power supply.

 

Table 20: Over Current Protection

Voltage

Over Current Limit (Iout limit)

+3.3 V

110% minimum; 150% maximum

 

 

+5 V

110% minimum; 150% maximum

 

 

+12V (combined)

Peak combine current minimum; 150% maximum

 

 

7.2240VA Protection

STATUS

Recommended

System designs may require user access to energized areas of the system. In these cases the power supply may be required to meet regulatory 240VA energy limits for any power rail. Since the +12V rail combined power exceeds 240VA it must be divided into separate channels to meet this requirement. Each separate rail needs to be limited to less than 20A for each +12V rail. The separate +12V rails do not necessarily need to be independently regulated outputs. They can share a common power conversion stage. The +12V rail is divided into two rails for the 350W power level and three rails for the 480W power level. See section 6.4 for how the +12V rail is split between different output connectors.

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Contents SSI Disclaimer Contents Tables Agency RequirementsPurpose Conceptual OverviewDefinitions/Terms/Acronyms RequiredMechanical Overview Required OptionalOptional Chassis Mounting Features Airflow RequirementsOptional RecommendedTemperature Requirements AC Inlet ConnectorAC Input Requirements Redundant AC InletsAC Input Voltage Specification Output Minimum Power EfficiencyEfficiency AC Input RatingAC Line Dropout AC Line FuseAC Inrush AC Line Transient Specification AC Line Fast Transient SpecificationAC Line Sag Transient Performance AC Line Surge Transient PerformanceDC Output Specification Output ConnectorsRequired Baseboard power connector Optional Processor Power ConnectorRequired Peripheral Power Connectors Required Floppy Power ConnectorPeripheral Power Connectors P9 Floppy Power ConnectorOptional Server Signal Connector Server Signal ConnectorGrounding Remote SenseOutput Power/Currents 350 W Load RatingsVoltage Minimum Continuous Maximum Continuous Peak 480 W Load RatingsVoltage Regulation Standby OutputsVoltage Regulation Limits Dynamic Loading Capacitive LoadingRipple / Noise Transient Load RequirementsRedundancy Hot Swap RequirementsRipple and Noise +3.3 +12 +5 VSBSSI Timing Requirements Output Voltage TimingDescription Turn On/Off Timing Recommended DescriptionTurn On/Off Timing Protection Circuits Current Limit240VA Protection Over Current ProtectionOver Temperature Protection Over Voltage ProtectionOver Voltage Limits Output VoltageControl and Indicator Functions Pson # Signal Characteristic Signal TypePwok delay PSON#Pwok Power OK Pwok Signal CharacteristicsField Replacement Unit FRU Signals SMBus CommunicationModule FRU Data Module FRU Data Format Product Info AreaMultiRecord Area Field Name PS Info Field Information DefinitionLED Indicators LED IndicatorsPower Supply LEDs Mtbf 10Agency Requirements
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