SSI America ERP2U User Manual
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
Revision History
Orig./Rev. Description of Changes
2.0
2.2
2.3
2.31
Post design guide
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
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.
Fixed error in 3.3V and 5V loading. Increased 3.3V/5V combined power.
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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 Graphics Inc., and International Business
Machines Corporation) DISCL AIM 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.
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ERP2U Power Supply Design Guide, V2.31
Contents
1 Purpose.......................................................................................................................................................... 7
2 Conceptual Overview ................................................................................................................................... 7
3 Definitions/Terms/Acronyms....................................................................................................................... 8
4 Mechanical Overview ................................................................................................................................... 9
4.1 Acoustic Requirements............................................................................................................................. 10
4.2 Airflow Requirements................................................................................................................................ 10
4.3 Temperature Requirements...................................................................................................................... 10
5 AC 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
6 DC 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
7 Protection Circuits...................................................................................................................................... 28
7.1 Current Limit.............................................................................................................................................. 28
7.2 240VA Protection...................................................................................................................................... 28
7.3 Over Voltage Protection............................................................................................................................ 29
7.4 Over Temperature Protection.................................................................................................................... 29
8 Control and Indicator Functions............................................................................................................... 30
8.1 PSON#...................................................................................................................................................... 30
8.2 PWOK (Power OK) ................................................................................................................................... 31
8.3 SMBus Communication............................................................................................................................. 31
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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 Module FRU Data Format.................................................................................................................. 32
8.6 LED Indicators........................................................................................................................................... 33
9 MTBF............................................................................................................................................................ 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
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ERP2U Power Supply Design Guide, V2.31
Table 34: FRU Device Product Information Area................................................................................................... 33
Table 35: LED Indicators........................................................................................................................................ 34
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ERP2U Power Supply Design Guide, V2.31
1
Purpose
This 2U Rack Power Supply Design Guide defines a common redu ndant 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 require ments 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 swap redundant configuration. The scope of this document defines the requirements for this power
assembly. The parameters of this supply are defined in this design guide for open industry use.
Conceptual Overview
2
In the Entry server market, the bulk power system must source power on sever al out put rails.
These rails are typically as follows:
• +3.3 V (optional from bulk supply)
• +5 V (optional from bulk supply)
• +12 V
• –12 V
• 5 V standby
NOTE
Local DC-DC converters shall be utilized for processor power, and will ideally convert power from the +12 V
rail, however, they may also convert power from other rails.
The bulk power system may be a n+1 redundant power system or a non-redundant power system.
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ERP2U Power Supply Design Guide, V2.31
3 Definitions/Terms/Acronyms
Required
Recommended
Optional
Autoranging
CFM
Dropout
Latch Off
Monotonically
Noise
Overcurrent
PFC
Ripple
Rise Time
Sag
Surge
VSB or Standby Voltage
MTBF
PWOK
The status given to items within this design guide, which are required to
meet SSI guidelines and a large majority of system applications.
The status given to items within this design guide which are not required to
meet SSI guidelines, however, are required by many system applications.
The status given to items within this design guide, which are not required to
meet SSI guidelines, however, some system applications may optionally
use these features.
A power supply that automatically senses and adjusts itself to the proper
input voltage range (110 VAC or 220 VAC). No manual switches or
manual adjustments are needed.
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. Manual intervention commonly includes
briefly removing and then reconnecting the supply, or it could be done
through a switch. Electronic intervention could be done by electronic
signals in the Server System.
A waveform changes from one level to another in a steady fashion, without
intermediate retracement or oscillation.
The periodic or random signals over frequency band of 0 Hz to 20 MHz.
A condition in which a supply attempts to provide more output current than
the amount for which it is rated. This commonly occurs if there is a "short
circuit" condition in the load attached to the supply.
Power Factor Corrected.
The periodic or random signals over a frequency band of 0 Hz to 20 MHz.
Rise time is defined as the time it takes any output voltage to rise from
10% to 95% of its nominal voltage.
The condition where the AC line voltage drops below the nominal voltage
conditions.
The condition where the AC line voltage rises above nominal voltage.
An output voltage that is present whenever AC power is applied to the AC
inputs of the supply.
Mean time between failure.
A typical logic level output signal provided by the supply that signals the
Server System that all DC output voltages are within their specified range.
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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 mod ules. A
mechanical drawing of the cage is shown below in
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 distributes output power from the
modules to a wire harness. Cooling fans, EMI filtering, and IEC inlet connector(s) may be located in the modules
or cage.
400.0 +/- 1.0
400.0 / 350.0 +/-1.0
SIDE VIEW
Figure 1. Two depths are defined to the cage; 400mm and
30 MAX
HANDLE/LATCH
#6-32 THD
2 PLACES
15.0 +/- 0.5
61.8 +/- 0.5
96.0 +/- 0.5
6.0 +/- 0.5
#6-32 THD
4 PLACES
6.0 +/- 0.5
6.0 +/- 0.5
83.0 +/- 0.5
118.0 +/- 1.0
113.0 +/- 0.5
MODULE
ACCESS
56.8 +/- 1.0
108.0 +/- 0.5
FRONT VIEWREAR VIEW
Figure 1: Enclosure Drawing
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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 Airflow Requirements
STATUS
Recommended
The air shall exit the power supply on the AC inlet face. The power supply shall meet all requirements with the
below system airflow impedance presented to the power supplies airflow path.
Figure 2 System Airflow Impedance
System Flow Impedance - 2U
0.6
O)
0.5
2
0.4
0.3
0.2
0.1
System Pressure ( i n H
0.0
0 5 10 15 20
Power Supply Ai rflow (CFM)
4.3 Temperature Requirements
STATUS
Recommended
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ERP2U Power Supply Design Guide, V2.31
The power supply shall operate within all specified limits over the T
through the power supply and not over the exterior surfaces of the power supply.
Table 2: Thermal Requirements
ITEM DESCRIPTION MIN MAX UNITS
T
op
T
non-op
The power supply must meet UL enclosure requirements for temperature rise limits. All sides of the power supply
with exception of the air exhaust side, must be classified as “Handle, knobs, grips, etc. held for short periods of
time only”.
Operating temperature range. 0 50
Non-operating temperature range. -40 70
5 AC Input Requirements
STATUS
Required
The power supply modules shall incorporate universal power input with active power factor co rrection, which shall
reduce line harmonics in accordance with the EN61000-3-2 and JEIDA MITI standard s.
temperature range. All airflow shall pass
op
°C
°C
5.1 AC Inlet Connector
STATUS
Required
The AC input connector shall be an IEC 320 C-14 power inlet. This inlet is rated for 15 A/250 VAC. This
connector may be located on the module or on the cage.
5.2 Redundant AC Inlets
STATUS
Recommended
The power supply assembly may have dual redundant AC inlets. The power supply shall be able to operate over
its full, specified range of requirements with either or both AC input powered. If there is a loss of one AC inlet the
power supplies shall continue to operate with no interruption of performance. It is required that all redundant
power supply modules be present to support redundant AC inlets.
5.3 AC Input Voltage Specification
STATUS
Required
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.
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