SSI America ERP2U Protection Circuits, Current Limit, 240VA Protection, Over Current Protection

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SSI

ERP2U Power Supply Design Guide, V2.31

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 27. 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 26: 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.

Table 27: Over Current Protection

Voltage

Over Current Limit (Iout limit)

+3.3 V

110% minimum; 150% maximum

 

 

+5 V

110% minimum; 150% maximum

 

 

+12V1,2,3,4

Peak current minimum; 20A maximum

 

 

1.Peak currents shall be maintained for a minimum of 500msec. The maximum duration of the peak current exceeding the 240VA limit should be limited to meet safety regulations. A maximum duration of 1 second is recommended.

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Contents SSI ERP2U Power Supply Design Guide Disclaimer Contents Error! Bookmark not defined TablesFRU Device Product Information Area Purpose Conceptual OverviewDefinitions/Terms/Acronyms RequiredMechanical Overview Required OptionalTemperature Requirements Recommended Acoustic Sound Power LevelsAcoustic Requirements Airflow RequirementsAC Inlet Connector AC Input Voltage SpecificationAC Input Requirements Redundant AC InletsInput Under Voltage EfficiencyAC Line Dropout AC Input RatingAC Line Transient Specification AC Line FuseAC Inrush AC Line Sag Transient PerformanceAC Line Surge Transient Performance AC Line Fast Transient SpecificationAC Line Surge DC Output Specification Output ConnectorsRequired Baseboard power connector P1 Baseboard Power Connector2 +12V4 Baseboard Power Connector Required Peripheral Power ConnectorsRequired Floppy Power Connector Peripheral Power ConnectorsSerial ATA Power Connector Server Signal ConnectorFloppy Power Connector Server Signal ConnectorOutput Power/Currents GroundingRemote Sense 550 W Load Ratings600 W Load Ratings 650 W Load Ratings700 W Load Ratings 750 W Load RatingsFan operation in standby mode Voltage RegulationStandby Outputs 800 W Load RatingsDynamic Loading Capacitive LoadingVoltage Regulation Limits Transient Load RequirementsCapacitve Loading Conditions Ripple / NoiseRipple and Noise Redundancy Hot Swap RequirementsOutput Voltage Timing Timing RequirementsDescription 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 Power Supply Management InterfacePwok Signal Characteristics SMBus CommunicationField Replacement Unit FRU Signals Module FRU Data Module FRU Data FormatProduct Info Area FRU Device InformationMultiRecord Area LED IndicatorsField Name PS Info Field Information Definition LED Indicators Power Supply LEDsMtbf 10Agency Requirements

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