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SSI
ERP2U
(Entry Redundant Power 2U)
Power Supply Design Guide
A Server System Infrastructure (SSI) Specification
For 2U Rack Chassis Power Supplies
Version 2.31
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SSI ERP2U Power Supply Design Guide, V2.31 Revision History Orig./Rev. Description of Changes Post design guide 2.0 Added higher power levels up to 800W. 2.2 Added 350mm depth. Removed lower power levels. Added standby fan operation. Added option for tighter 12V regulation. Added 12V4. Add new SSI efficiency requirements (recommended level & loading conditions). Reduced holdup time requirements to 75% of max load. Increase 12V rails for >650W. Tpwok_on max time reduc
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SSI ERP2U Power Supply Design Guide, V2.31 Disclaimer: THIS SPECIFICATION IS PROVIDED "AS IS" WITH NO WARRANTIES WHATSOEVER, INCLUDING ANY WARRANTY OF MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR ANY PARTICULAR PURPOSE, OR ANY WARRANTY OTHERWISE ARISING OUT OF ANY PROPOSAL, SPECIFICATION OR SAMPLE. WITHOUT LIMITATION, THE PROMOTERS (Intel Corporation, NEC Corporation, Dell Computer Corporation, Data General a division of EMC Corporation, Compaq Computer Corporation, Silicon Gra
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SSI ERP2U Power Supply Design Guide, V2.31 Contents 1 Purpose.......................................................................................................................................................... 7 2 Conceptual Overview ................................................................................................................................... 7 3 Definitions/Terms/Acronyms..........................................................................................
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SSI ERP2U Power Supply Design Guide, V2.31 8.4 Power Supply Management Interface....................................................................................................... 31 8.5 Field Replacement Unit (FRU) Signals ..................................................................................................... 32 8.5.1 Module FRU Data .............................................................................................................................. 32 8.5.2 M
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SSI ERP2U Power Supply Design Guide, V2.31 Table 34: FRU Device Product Information Area................................................................................................... 33 Table 35: LED Indicators ........................................................................................................................................ 34 - 6 -
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SSI ERP2U Power Supply Design Guide, V2.31 1 Purpose This 2U Rack Power Supply Design Guide defines a common redundant power sub-system used in 2U rack mount servers. The power sub-system is made up of a cage and hot swap redundant power modules. This Design Guide covers the mechanical and electrical requirements of this power sub-system. The requirements of the individual hot swap modules are left open. This power sub-system may range from 550 to 800 watts and is used in a hot swa
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SSI ERP2U Power Supply Design Guide, V2.31 3 Definitions/Terms/Acronyms Required The status given to items within this design guide, which are required to meet SSI guidelines and a large majority of system applications. Recommended The status given to items within this design guide which are not required to meet SSI guidelines, however, are required by many system applications. Optional The status given to items within this design guide, which are not required to meet SSI guideline
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SSI ERP2U Power Supply Design Guide, V2.31 4 Mechanical Overview STATUS Required (Optional) The ERP2U is a power sub-system made up of a cage and redundant, hot swappable power supply modules. A mechanical drawing of the cage is shown below in Figure 1. Two depths are defined to the cage; 400mm and 350mm. This cage is intended to be mounted in the system and not redundant or hot swappable. The exterior face of the cage accepts hot swappable power supply modules. The cage distri
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SSI ERP2U Power Supply Design Guide, V2.31 4.1 Acoustic Requirements STATUS Recommended It is recommended the power supplies have a variable speed fan based on temperature and loading conditions. There are three different acoustic sound power levels defined at different ambient temperatures and loading conditions. Table 1 Recommended Acoustic Sound Power Levels Idle Typical Max Ambient Temperature 28ºC 28ºC 45ºC % Loading 30% 60% 100% Sound Power (BA) 5.2 5.6 6.1 4.2 Airflo
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SSI ERP2U Power Supply Design Guide, V2.31 The power supply shall operate within all specified limits over the T temperature range. All airflow shall pass op through the power supply and not over the exterior surfaces of the power supply. Table 2: Thermal Requirements ITEM DESCRIPTION MIN MAX UNITS Operating temperature range. 0 50 T °C op Non-operating temperature range. -40 70 °C T non-op The power supply must meet UL enclosure requirements for temperature rise limits. All sides
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SSI ERP2U Power Supply Design Guide, V2.31 Table 3: AC Input Rating PARAMETER MIN RATED MAX Voltage (110) 90 V 100-127 V 140 V rms rms rms Voltage (220) 180 V 200-240 V 264 V rms rms rms Frequency 47 Hz 63 Hz 5.4 Input Under Voltage STATUS Required The power supply shall contain protection circuitry such that application of an input voltage below the minimum specified in section 5.3 shall not cause damage to the power supply. 5.5 Efficiency STATUS Recommended/Required T
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SSI ERP2U Power Supply Design Guide, V2.31 AC line shall not cause damage to the power supply. In the case of redundant AC inputs, the AC line dropout may occur on either or both AC inlet. 5.7 AC Line Fuse STATUS Required The power supply shall incorporate one input fuse on the LINE side for input over-current protection to prevent damage to the power supply and meet product safety requirements. Fuses should be slow blow type or equivalent to prevent nuisance trips. AC inrush cur
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SSI ERP2U Power Supply Design Guide, V2.31 recoverable Table 6: AC Line Surge Transient Performance AC Line Surge Duration Surge Operating AC Voltage Line Frequency Performance Criteria Continuous 10% Nominal AC Voltages 50/60 Hz No loss of function or performance 0 to ½ AC 30% Mid-point of nominal AC 50/60 Hz No loss of function or performance cycle Voltages 5.10 AC Line Fast Transient Specification STATUS Recommended The power supply shall meet the EN61000-4-5 directive and a
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SSI ERP2U Power Supply Design Guide, V2.31 6 DC Output Specification These are the output requirements for the power supply assembly including cage and module. 6.1 Output Connectors The power supply distribution board shall have one of the two following output connector and wire harness configurations, depending upon the type of 12V rail configuration needed by the system. 6.1.1 Required Baseboard power connector STATUS Required Connector housing: 24-Pin Molex 39-01-2240 or eq
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SSI ERP2U Power Supply Design Guide, V2.31 If 240VA limiting is not a requirement for the power supply than all +12V outputs are common and may have the same wire color (yellow). 6.1.2 +12V4 Baseboard Power Connector STATUS Required for 700W, 750W and 800W power levels Systems that require more then 16A of +12V current to the baseboard will require this additional 2x2 power connector. This is due to the limited +12V capability of the 2x12 baseboard power connector. +12V4 will power
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SSI ERP2U Power Supply Design Guide, V2.31 2. If 240VA limiting is not a requirement for the power supply than all +12V outputs are common and may have the same wire color. 6.1.5 Serial ATA Power Connector STATUS Optional This is a required connector for systems with serial ATA devices. The detailed requirements for the serial ATA connector can be found in the “Serial ATA : High Speed Serialized www.serialata.org. AT Attachment “ specification at Molex Housing #675820000 Molex Ter
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SSI ERP2U Power Supply Design Guide, V2.31 1 SMBus Clock White/Green Stripe 2 SMBus Data White/Yellow Stripe 3 SMBAlert 4 ReturnS Black/White Stripe 5 3.3RS Orange/White Stripe 6.2 Grounding STATUS Required The ground of the pins of the power assembly wire harness provides the power return path. The wire harness ground pins shall be connected to safety ground (power supply enclosure). 6.3 Remote Sense STATUS Optional The power assembly may have remote sense for the +3.
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SSI ERP2U Power Supply Design Guide, V2.31 +12V1 0 A 16 A 18 A +12V2 0 A 16 A 18 A +12V3 0.9 A 14 A +12V4 0.1 A 8 A 13 A -12 V 0 A 0.5 A +5 VSB 0.1 A 2.0 A 1. Maximum continuous total DC output power should not exceed 550 W. 2. Maximum continuous combined load on +3.3 VDC and +5 VDC outputs shall not exceed 140 W. 3. Maximum Peak total DC output power should not exceed 630 W. 4. Peak power and current loading shall be supported for a minimum of 10 second. 5. Maximum combined cu
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SSI ERP2U Power Supply Design Guide, V2.31 4. Peak power and current loading shall be supported for a minimum of 10 second. 5. Maximum combined current for the 12 V outputs shall be 45 A. 6. Maximum 12V combined peak current shall be 54 A. 7. The 3.3V and 5V may be supply by the module or DC/DC converters powered from +12V in the cage. Table 16: 700 W Load Ratings Voltage Minimum Continuous Maximum Continuous Peak 7 +3.3 V 0.8 A 24 A 7 +5 V 0.5 A 30 A +12V1 0 A 16 A 18 A +12V2
