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Summary of Contents for SSI America EPS1U
- Page 1 EPS1U Power Supply Design Guide, V1.1 EPS1U Power Supply Design Guide A Server System Infrastructure (SSI) Specification For 1U Rack Chassis Power Supplies Version 1.1...
- Page 2 S.S.I. Specification Adopter's Agreement. Copyright Intel Corporation, NEC Corporation, Dell Computer Corporation, Data General a division of EMC Corporation, Compaq Computer Corporation, Silicon Graphics Inc., International Business Machines Corporation, 2001.
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Page 3: Table Of Contents
Control and Indicator Functions... 25 PSON ... 25 PWOK (Power OK)... 26 ACWarning ... 27 Field Replacement Unit (FRU) Signals ... 28 8.4.1 FRU Data ... 28 8.4.2 FRU Data Format... 28 LED Indicator... 30 EPS1U Power Supply Design Guide, V1.1... - Page 4 Table 21: PWOK Signal Characteristics ... 26 Table 22: ACWarning Signal Characteristics... 27 Table 23: FRU Device Information... 28 Table 24: FRU Device Product Information Area... 28 Table 25: FRU Device MultiRecord Area... 29 Table 26: LED Indicators... 30 EPS1U Power Supply Design Guide, V1.1...
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Page 5: Purpose
This specification defines a non-redundant power supply that supports 1U rack mount entry server systems. The entry-level power supply is not intended to be a hot swap type of power supply. The parameters of this supply are defined in this specification for open industry use. This specification defines a 125W, 250 W and 350 W power supply with six outputs;... -
Page 6: Definitions/Terms/Acronyms
Cubic Feet per Minute (airflow). A condition that allows the line voltage input to the power supply to drop to below the minimum operating voltage. A power supply, after detecting a fault condition, shuts itself off. Even if the fault condition disappears the supply does not restart unless manual or electronic intervention occurs. -
Page 7: Mechanical Overview
The high power edge card form factor is intended for use at 250W and 350W power levels. Refer to Figure 1 for details. The supply will provide its output power via a card edge on the interior face of the power supply to provide users and manufacturers easy installation and removal of the power supply into the system. -
Page 8: Alternate Enclosure
STATUS Small Power Form Factor Systems may require a smaller power supply enclosure. Figure 2 details a smaller power supply enclosure for such systems. This form factor accommodates power levels of 250W and 125W. The supply will provide output power via a wire harness out the interior face of the supply. Refer to the Entry Electronics Bay Specification at the SSI web site (http://www.ssiforum.org/docs/entry_elecbay_spec_v2_0.pdf) for possible output connector... -
Page 9: Airflow Requirements
The power supply shall have a two-speed fan(s) and provide cooling to both the supply and the system. During low-speed fan operation, the power supply shall not exceed a noise level of 38 dBA measured at one meter on all faces. -
Page 10: Ac Input Requirements
The power supply must operate within all specified limits over the following input voltage range. Harmonic distortion of up to 10% THD must not cause the power supply to go out of specified limits. The power supply shall operate properly at 85 VAC input voltage to guarantee proper design margins. -
Page 11: Efficiency
AC inrush current shall not cause the AC line fuse to blow under any conditions. All protection circuits in the power supply shall not cause the AC fuse to blow unless a component in the power supply has failed. This includes DC output load short conditions. -
Page 12: Ac Line Transient Specification
“brownout” conditions) will be defined as the AC line voltage dropping below nominal voltage. Surge will be defined as the AC line voltage rising above nominal voltage. The power supply shall meet the requirements under the following AC line sag and surge conditions. Duration... -
Page 13: Dc Output Specification
The card edge pin assignments are listed in Table 6. Figure 3 shows the card edge layout for the power supply. The connector located in the system is an AMP 1364999-1 or equivalent. -
Page 14: Figure 3: Edge Finger Layout
Keying Notch 21.59 +/-0.05 6.35 +/-0.05 6.35 +/-0.05 6.35 +/-0.05 1.07 +/-0.05 51.89 +/-0.05 Bottom view of power supply Figure 3: Edge Finger Layout EPS1U Power Supply Design Guide, V1.1 6.35 +/-0.05 1.57 x 45 5.08 MIN 0.38 x 45... -
Page 15: Grounding
The power supply may have remote sense return (ReturnS) to regulate out ground drops for all output voltages; +3.3 V, +5 V, +12 V1, +12 V2, -12 V, and 5 VSB. The power supply may use remote sense (3.3VS) to regulate out drops in the system for the +3.3 V output. -
Page 16: Table 7: 125 W Load Ratings
Maximum Continuous 0.2 A 5.0 A 0.2 A 5.0 A 0.2 A 8.0 A 0.2 A 2.0 A 0.5 A 0.1 A 2.0 A EPS1U Power Supply Design Guide, V1.1 Peak Peak See note 2 See note 2 Peak 4.0 A... -
Page 17: Standby Outputs
Peak power and current loading shall be supported for a minimum of 12 seconds. 6.4.1 Standby Outputs STATUS Required The 5 VSB output shall be present when an AC input greater than the power supply turn on voltage is applied. Table 9: 350 W Load Ratings Load Range 1 Minimum Continuous Maximum Continuous 1.5 A... -
Page 18: Voltage Regulation
(ReturnS) signal. The 5 V, 12 V1, 12 V2, –12 V and 5 VSB outputs are measured at the power supply connectors referenced to ReturnS. The +3.3 V is measured at its remote sense signal (3.3 VS) located at the signal connector. -
Page 19: Capacitive Loading
The maximum allowed ripple/noise output of the power supply is defined in Table 14 below. This is measured over a bandwidth of 0 Hz to 20 MHz at the power supply output connectors. A 10 F tantalum capacitor in parallel with a 0.1 F ceramic capacitor are placed at the point of measurement. -
Page 20: Timing Requirements
STATUS Required These are the timing requirements for the power supply operation. The output voltages must rise from 10% to within regulation limits (T ) within 5 to 70 ms. The +3.3 V, +5 V and +12 V output voltages should start to vout_rise rise at about the same time. -
Page 21: Table 16: Turn On/Off Timing
AC. Delay from loss of AC to deassertion of PWOK. pwok_holdup Time 5VSB output voltage stays within regulation sb_holdup after loss of AC. Table 16: Turn On/Off Timing EPS1U Power Supply Design Guide, V1.1 Units 1500 2500 1000 1000 UNITS... -
Page 22: Figure 5: Turn On/Off Timing (Signal Power Supply)
EPS1U Power Supply Design Guide, V1.1 AC Input vout_holdup Vout pwok_low AC_on_delay pwok_off sb_on_delay pwok_on sb_on_delay pwok_off pwok_on PWOK pson_pwok pwok_holdup Tsb_holdup 5VSB sb_vout pson_on_delay PSON# AC turn on/off cycle PSON turn on/off cycle Figure 5: Turn On/Off Timing (Signal Power Supply) -
Page 23: Protection Circuits
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 17. If the current limits are exceeded, the power supply shall shutdown and latch off. The latch will be cleared by toggling the PSON damaged from repeated power cycling in this condition. -
Page 24: Over Voltage Protection
The voltage shall never exceed the maximum levels when measured at the power pins of the power supply connector during any single point of fail. The voltage shall never trip any lower than the minimum levels when measured at the power pins of the power supply connector. -
Page 25: Control And Indicator Functions
Control and Indicator Functions The following sections define the input and output signals from the power supply. Signals that can be defined as low true use the following convention: signal = low true 8.1 PSON STATUS Required The PSON signal is required to remotely turn on/off the power supply. PSON on the +3.3 V, +5 V, +12 V, and –12 V power rails. -
Page 26: Pwok (Power Ok)
Required PWOK is a power OK signal and will be pulled HIGH by the power supply to indicate that all the outputs are within the regulation limits of the power supply. When any output voltage falls below regulation limits or when AC power has been removed for a time sufficiently long so that power supply operation is no longer guaranteed, PWOK will be de-asserted to a LOW state. -
Page 27: Acwarning
Optional This is an output signal from the power supply which provides a warning to the system that the power supply has lost its AC input. This signal also provides a signal to synchronize the turn on of multiple power supplies. At turn on, this signal is pulled LOW when the supply’s internal bulk voltage has reached a level that allows it to turn on. -
Page 28: Field Replacement Unit (Fru) Signals
Optional Two pins will be allocated for the FRU information on the power supply connector. One pin is the Serial Clock (SCL). The second pin is used for Serial Data (SDA). Both pins are bi-directional and are used to form a serial bus. -
Page 29: Table 25: Fru Device Multirecord Area
8.4.2.2 MultiRecord Area As defined by the IPMI FRU document. The following record types shall be used on this power supply: Power Supply Information (Record Type 0x00) DC Output (Record Type 0x01) No other record types are required for the power supply. -
Page 30: Led Indicator
Required There will be a single GREEN LED to indicate power supply status. When AC is applied to the PSU and standby voltages are available the LED shall BLINK GREEN. The LED shall turn ON GREEN to indicate that all the power outputs are available. -
Page 31: Agency Requirements
The power supply, when installed in the system, shall meet immunity requirements specified in EN55024. Specific tests are to be EN61000-4-2 ,-3, -4, -5, -6, -8, and -11. The power supply must maintain normal performance within specified limits. This testing must be completed by the system EMI engineer. Conformance must be designated with the European Union CE Marking.
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