SSI America ERP2U Guide

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

SSI
ERP2U Power Supply Design Guide, V2.31
- 2 -
Revision History
Orig./Rev. Description of Changes
2.0 Post design guide
2.2 Added higher power levels up to 800W.
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 reduced to 500msec.
Change 5VSB to 3.0A for >650W.
Added reference to PSMI spec.
Modified SMBus section (FRU and PSMI) to 3.3V with 5V tolerance.
Modified 240VA section; removed common plane, change to <20A for all 12V outputs.
Updated sound power & airflow requirements
Remove reference to split and common rails
Updated efficiency testing method
2.3 Increase 5V current to 30A and combined 3.3V/5V power to 160W for the 700-800W power levels.
Increase 12V1/2 current for 550W-650W power levels. Relax require regulation limits. Added
optional regulation limits.
2.31 Fixed error in 3.3V and 5V loading. Increased 3.3V/5V combined power.

SSI
ERP2U Power Supply Design Guide, V2.31
- 3 -
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 Graphics Inc., and International Business
Machines Corporation) DISCLAIM ALL LIABILITY FOR COST OF PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES, LOST PROFITS, LOSS OF USE, LOSS OF
DATA OR ANY INCIDENTAL, CONSEQUENTIAL, DIRECT, INDIRECT, OR SPECIAL
AMAGES, WHETHER UNDER CONTRACT, TORT, WARRANTY OR OTHERWISE,
ARISING IN ANY WAY OUT OF USE OR RELIANCE UPON THIS SPECIFICATION OR
ANY INFORMATION HEREIN.
The Promoters disclaim all liability, including liability for infringement of any proprietary
rights, relating to use of information in this specification. No license, express or implied,
by estoppel or otherwise, to any intellectual property rights is granted herein.
This specification and the information herein is the confidential and trade secret
information of the Promoters. Use, reproduction and disclosure of this specification and
the information herein are subject to the terms of the S.S.I. Specification Adopter's
Agreement.
Copyright ©Intel Corporation, Dell Computer Corporation, Hewlett Packard Company, Silicon Graphics Inc.,
International Business Machines Corporation, 2002-2003.

SSI
ERP2U Power Supply Design Guide, V2.31
- 4 -
Contents
1Purpose.......................................................................................................................................................... 7
2Conceptual Overview ................................................................................................................................... 7
3Definitions/Terms/Acronyms....................................................................................................................... 8
4Mechanical Overview ................................................................................................................................... 9
4.1 Acoustic Requirements............................................................................................................................. 10
4.2 Airflow Requirements................................................................................................................................ 10
4.3 Temperature Requirements...................................................................................................................... 10
5AC Input Requirements.............................................................................................................................. 11
5.1 AC Inlet Connector.................................................................................................................................... 11
5.2 Redundant AC Inlets................................................................................................................................. 11
5.3 AC Input Voltage Specification ................................................................................................................. 11
5.4 Input Under Voltage.................................................................................................................................. 12
5.5 Efficiency................................................................................................................................................... 12
5.6 AC Line Dropout........................................................................................................................................ 12
5.7 AC Line Fuse ............................................................................................................................................ 13
5.8 AC Inrush .................................................................................................................................................. 13
5.9 AC Line Transient Specification................................................................................................................ 13
5.10 AC Line Fast Transient Specification.................................................................................................... 14
6DC Output Specification ............................................................................................................................ 15
6.1 Output Connectors.................................................................................................................................... 15
6.1.1 Required Baseboard power connector..............................................................................................15
6.1.2 +12V4 Baseboard Power Connector.................................................................................................16
6.1.3 Required Peripheral Power Connectors............................................................................................16
6.1.4 Required Floppy Power Connector.................................................................................................... 16
6.1.5 Serial ATA Power Connector............................................................................................................. 17
6.1.6 Server Signal Connector.................................................................................................................... 17
6.2 Grounding.................................................................................................................................................. 18
6.3 Remote Sense .......................................................................................................................................... 18
6.4 Output Power/Currents ............................................................................................................................. 18
6.4.1 Standby Outputs................................................................................................................................ 21
6.4.2 Fan operation in standby mode......................................................................................................... 21
6.5 Voltage Regulation.................................................................................................................................... 21
6.6 Dynamic Loading ...................................................................................................................................... 22
6.7 Capacitive Loading.................................................................................................................................... 22
6.8 Ripple / Noise............................................................................................................................................ 23
6.9 Redundancy.............................................................................................................................................. 24
6.10 Hot Swap Requirements........................................................................................................................ 24
6.11 Timing Requirements ............................................................................................................................ 25
7Protection Circuits...................................................................................................................................... 28
7.1 Current Limit.............................................................................................................................................. 28
7.2 240VA Protection...................................................................................................................................... 28
7.3 Over Voltage Protection............................................................................................................................ 29
7.4 Over Temperature Protection.................................................................................................................... 29
8Control and Indicator Functions............................................................................................................... 30
8.1 PSON#...................................................................................................................................................... 30
8.2 PWOK (Power OK) ................................................................................................................................... 31
8.3 SMBus Communication............................................................................................................................. 31

SSI
ERP2U Power Supply Design Guide, V2.31
- 5 -
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 Module FRU Data Format.................................................................................................................. 32
8.6 LED Indicators........................................................................................................................................... 33
9MTBF............................................................................................................................................................ 35
10 Agency Requirements................................................................................................................................ 35
Figures
Figure 1: Enclosure Drawing.................................................................................................................................... 9
Figure 2 System Airflow Impedance........................................................................................................................ 10
Figure 3: Output Voltage Timing............................................................................................................................. 25
Figure 4: Turn On/Off Timing.................................................................................................................................. 27
Figure 5: PSON# Signal Characteristics ................................................................................................................ 30
Tables
Table 1 Recommended Acoustic Sound Power Levels .......................................................................................... 10
Table 2: Thermal Requirements............................................................................................................................. 11
Table 3: AC Input Rating........................................................................................................................................ 12
Table 4: Efficiency .................................................................................................................................................. 12
Table 5 Efficiency Loading Table ..............................................................................Error! Bookmark not defined.
Table 6: AC Line Sag Transient Performance........................................................................................................ 13
Table 7: AC Line Surge Transient Performance .................................................................................................... 14
Table 8: P1 Baseboard Power Connector.............................................................................................................. 15
Table 9: Processor Power Connector..................................................................................................................... 15
Table 10: Peripheral Power Connectors................................................................................................................. 16
Table 11: P9 Floppy Power Connector................................................................................................................... 16
Table 12: Floppy Power Connector....................................................................................................................... 17
Table 13: Server Signal Connector ........................................................................................................................ 17
Table 14: 550 W Load Ratings............................................................................................................................... 18
Table 15: 600 W Load Ratings............................................................................................................................... 19
Table 16: 650 W Load Ratings............................................................................................................................... 19
Table 17: 700 W Load Ratings............................................................................................................................... 20
Table 18: 750 W Load Ratings............................................................................................................................... 20
Table 19: 800 W Load Ratings............................................................................................................................... 21
Table 20: Voltage Regulation Limits....................................................................................................................... 22
Table 21: Optional +5V Regulation Limits.............................................................................................................. 22
Table 22: Transient Load Requirements................................................................................................................ 22
Table 23: Capacitve Loading Conditions................................................................................................................ 23
Table 24: Ripple and Noise.................................................................................................................................... 23
Table 25: Output Voltage Timing............................................................................................................................ 25
Table 26: Turn On/Off Timing................................................................................................................................. 26
Table 27: Over Current Protection.......................................................................................................................... 28
Table 28: Over Current Protection.......................................................................................................................... 28
Table 29: Over Voltage Limits................................................................................................................................ 29
Table 30: PSON#Signal Characteristic.................................................................................................................. 30
Table 31: PWOK Signal Characteristics................................................................................................................. 31
Table 32: FRU Device Information......................................................................................................................... 32
Table 33: FRU Device Product Information Area................................................................................................... 32