SSI America EPS2U User Manual
SSI
EPS2U
Power Supply Design Guide
A Server System Infrastructure (SSI) Specification
For Entry Chassis Power Supplies
Revision 2.1
Revision History
Orig./Rev. Description of Changes Date
1.0 Initial release of EPS2U specification
1.1 Updated EPS2U spec with an added 12V 240VA channel, updated mounting
features, and added gold comment for gold signal contacts
1.2 Approved EPS2U specification including changes from 4/23/2002 SSI council meeting 4/23/02
2.0 Added output power level recommendations for 550W, 600W, and 650W power
supplies and updated connector pin-outs.
Modified 12V continuous and peak requirements for 480W power level.
Updated transient load requirements, 240VA requirements, and signal description for
PWOK.
Removed temperature rise requirements from thermal section and added efficiency
and airflow recommendations for each power level.
2.1
Section 4.2 - Changed operating temperature to 45°C from 50°C
Section 6.1 - Added 3.3V remote sense to pin 1 of baseboard connector
Section 6.1 - Changed +12V4 wire color to Yellow/Green stripe
Added Section 6.1.1 – 12V Power Rail Configurations
Section 6.4 - Changed output load rating tables
Defined one load range per output level (vs. two)
Increased +12V currents for 550, 600 & 650W split plane supplies
4/14/02
9/27/02
5/16/03
Section 6.6 - Adjusted transient load requirements
SSI
EPS2U Power Supply Design Guide, V2.1
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.
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SSI
EPS2U Power Supply Design Guide, V2.1
Contents
1 Purpose.......................................................................................................................................................... 5
2 Conceptual Overview ................................................................................................................................... 5
3 Definitions/Terms/Acronyms....................................................................................................................... 6
4 Mechanical Overview ................................................................................................................................... 7
4.1 Airflow Requirements .................................................................................................................................. 8
4.2 Temperature Requirements ........................................................................................................................ 8
5 AC Input Requirements................................................................................................................................ 9
5.1 AC Inlet Connector...................................................................................................................................... 9
5.2 AC Input Voltage Specification ................................................................................................................... 9
5.3 Efficiency ..................................................................................................................................................... 9
5.4 AC Line Dropout........................................................................................................................................ 10
5.5 AC Line Fuse ............................................................................................................................................ 10
5.6 AC Inrush .................................................................................................................................................. 10
5.7 AC Line Transient Specification................................................................................................................ 10
5.8 AC Line Fast Transient Specification........................................................................................................ 11
6 DC Output Specification ............................................................................................................................ 12
6.1 Output Connectors .................................................................................................................................... 12
6.1.1 12V Power Rail Configurations.......................................................................................................... 12
6.1.2 Baseboard power connector.............................................................................................................. 13
6.1.3 Processor Power Connector.............................................................................................................. 14
6.1.4 Peripheral Power Connectors............................................................................................................ 15
6.1.5 Floppy Power Connector ................................................................................................................... 15
6.1.6 Server Signal Connector.................................................................................................................... 15
6.2 Grounding.................................................................................................................................................. 16
6.3 Remote Sense .......................................................................................................................................... 16
6.4 Output Power/Currents ............................................................................................................................. 17
6.4.1 Standby Outputs ................................................................................................................................ 18
6.5 Voltage Regulation.................................................................................................................................... 19
6.6 Dynamic Loading ...................................................................................................................................... 20
6.7 Capacitive Loading.................................................................................................................................... 20
6.8 Ripple / Noise............................................................................................................................................ 21
6.9 Timing Requirements ................................................................................................................................ 21
7 Protection Circuits...................................................................................................................................... 24
7.1 Current Limit.............................................................................................................................................. 24
7.2 240VA Protection ...................................................................................................................................... 24
7.3 Over Voltage Protection ............................................................................................................................ 25
7.4 Over Temperature Protection.................................................................................................................... 25
8 Control and Indicator Functions ............................................................................................................... 26
8.1 PSON# ...................................................................................................................................................... 26
8.2 PWOK (Power OK) ................................................................................................................................... 27
8.3 Field Replacement Unit (FRU) Signals ..................................................................................................... 27
8.3.1 FRU Data ........................................................................................................................................... 27
8.3.2 FRU Data Format............................................................................................................................... 28
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EPS2U Power Supply Design Guide, V2.1
9 MTBF ............................................................................................................................................................ 30
10 Agency Requirements................................................................................................................................ 30
Figures
Figure 1: Enclosure Drawing .................................................................................................................................... 7
Figure 2: Output Voltage Timing............................................................................................................................. 22
Figure 3: Turn On/Off Timing (Single Power Supply)............................................................................................. 23
Figure 4: PSON# Signal Characteristics ................................................................................................................ 26
Tables
Table 1: Thermal Requirements ............................................................................................................................... 8
Table 2: AC Input Rating .......................................................................................................................................... 9
Table 3: Efficiency .................................................................................................................................................... 9
Table 4: AC Line Sag Transient Performance........................................................................................................ 11
Table 5: AC Line Surge Transient Performance .................................................................................................... 11
Table 6: 12V Rail Summary.................................................................................................................................... 12
Table 7: P1 Baseboard Power Connector – Common Plane................................................................................. 13
Table 8: P1 Baseboard Power Connector – Split Plane......................................................................................... 13
Table 9: Processor Power Connector – Common Plane........................................................................................ 14
Table 10: Processor Power Connector – Split Plane ............................................................................................. 14
Table 11: Peripheral Power Connectors................................................................................................................. 15
Table 12: P9 Floppy Power Connector................................................................................................................... 15
Table 13: Server Signal Connector ........................................................................................................................ 16
Table 14: 480 W Load Ratings – Common Plane.................................................................................................. 17
Table 15: 550 W Load Ratings – Split Plane.......................................................................................................... 17
Table 16: 600 W Load Ratings – Split Plane.......................................................................................................... 18
Table 17: 650 W Load Ratings – Split Plane.......................................................................................................... 18
Table 18: Voltage Regulation Limits....................................................................................................................... 19
Table 19: Optional +5V Regulation Limits .............................................................................................................. 19
Table 20: Transient Load Requirements ................................................................................................................ 20
Table 21: Capacitve Loading Conditions................................................................................................................ 20
Table 22: Ripple and Noise .................................................................................................................................... 21
Table 23: Output Voltage Timing............................................................................................................................ 21
Table 24: Turn On/Off Timing................................................................................................................................. 22
Table 25: Over Current Protection.......................................................................................................................... 24
Table 26: Over Current Protection.......................................................................................................................... 25
Table 27: Over Voltage Limits ................................................................................................................................ 25
Table 28: PSON# Signal Characteristic .................................................................................................................. 26
Table 29: PWOK Signal Characteristics................................................................................................................. 27
Table 30: FRU Device Information ......................................................................................................................... 28
Table 31: FRU Device Product Information Area ................................................................................................... 28
Table 32: FRU Device Product Information Area ................................................................................................... 29
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SSI
EPS2U Power Supply Design Guide, V2.1
1
Purpose
This 2U Rack Power Supply Specification defines a common power supply used in entry-level servers. This
supply may range typically from 400 to 700 watts and is used in a non-redundant configuration. The scope of this
document defines the requirements for one supply in this power range. The parameters of this supply are defined
in this specification for open industry use.
This specification defines 480W, 550W, 600W, and 650W power supplies with multiple outputs; 3.3 V, 5 V, 12V, 12 V, and 5 VSB. Because of its connector leads, the power supply is not intended to be a hot swap type of
power supply.
2
Conceptual Overview
In the Entry server market, the bulk power system must source power on several output rails.
These rails are typically as follows:
• +3.3 V
• +5 V
• +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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SSI
EPS2U Power Supply Design Guide, V2.1
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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SSI
A
EPS2U Power Supply Design Guide, V2.1
4 Mechanical Overview
STATUS
Required (Optional)
Note: Some enclosure features are noted as optional in the drawing below. These features may be use in some
chassis designs where only top access is allowed for the cage mounting.
The EPS2U is a power supply enclosure intended to handle a power range of 400W to 700W. A mechanical
drawing of the power supply cage is shown below in Figure 1.
Optional mounting features for top access
mounting of the power supply.
llow for 1.2mm
protrusion (x4)
Figure 1: Enclosure Drawing
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SSI
EPS2U Power Supply Design Guide, V2.1
4.1 Airflow Requirements
STATUS
Recommended
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 must not exceed a noise level of 43 dBa measured at one meter on all
faces. At low fan speed, the power supply shall provide a minimum of 12 CFM of airflow with 0.003 inH
system backpressure. At high fan speed, the power supply shall provide a minimum of 20 CFM with 0.006 inH2O
of system backpressure.
4.2 Temperature Requirements
STATUS
Recommended
The power supply shall operate within all specified limits over the Top temperature range. The average air
temperature difference (∆T
below in Table 1. All airflow shall pass through the power supply and not over the exterior surfaces of the power
supply.
) from the inlet to the outlet of the power supply shall not exceed the values shown
ps
2O of
Table 1: Thermal Requirements
ITEM DESCRIPTION MIN MAX UNITS
Top
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
°C
°C
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SSI
EPS2U Power Supply Design Guide, V2.1
5 AC Input Requirements
STATUS
Required
The power supply shall incorporate universal power input with active power factor correction, which shall reduce
line harmonics in accordance with the EN61000-3-2 and JEIDA MITI standards.
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.
5.2 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.
Table 2: AC Input Rating
PARAMETER MIN RATED MAX
Voltage (110) 90 V
Voltage (220) 180 V
Frequency 47 Hz 63 Hz
100-127 V
rms
200-240 V
rms
140 V
rms
264 V
rms
rms
rms
5.3 Efficiency
STATUS
Recommended
The following efficiency requirements are provided as a recommendation to allow for proper power supply cooling
when installed in a system.
Table 3: Efficiency
Power Level Efficiency Airflow (reference)
480W 68% 20 CFM
550W 68% 20 CFM
600W 72% 20 CFM
650W 72% 20 CFM
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