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EPS12V
Version 2.0 Power Supply Design Guide
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Enhance EPS12V Version 2.8 Power Supply Design Guide

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SSI
EPS12V
Power Supply Design Guide
A Server System Infrastructure (SSI) Specification
For Entry Chassis Power Supplies
SSI
EPS12V Power Supply Design Guide, V2.8
Orig./Rev. Description of Changes
2.1
2.8
Posted design guide
Remove references to common and split 12V planes.
Added higher power levels up to 800W.
Reduced holdup time requirements to 75% of max load.
Added cross loading plots.
Added option for tighter 12V regulation.
Add new SSI efficiency requirements (recommended level & loading conditions).
Increase 12V rail currents.
Tpwok_on max time reduced to 500msec.
Change 5VSB to 3.0A for higher power levels.
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
Add SATA and PCI-Express GFX connectors
Updated efficiency testing method
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EPS12V Power Supply Design Guide, V2.8
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 – 2004.
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EPS12V Power Supply Design Guide, V2.8
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 ...................................................................................................................... 11
5 AC Input Requirements.............................................................................................................................. 12
5.1 AC Inlet Connector.................................................................................................................................... 12
5.2 AC Input Voltage Specification ................................................................................................................. 12
5.3 Input Under Voltage .................................................................................................................................. 12
5.4 Efficiency ................................................................................................................................................... 12
5.5 AC Line Dropout........................................................................................................................................ 13
5.6 AC Line Fuse ............................................................................................................................................ 13
5.7 AC Inrush .................................................................................................................................................. 13
5.8 AC Line Transient Specification................................................................................................................ 14
5.9 AC Line Fast Transient Specification........................................................................................................ 14
6 DC Output Specification ............................................................................................................................ 15
6.1 Output Connectors .................................................................................................................................... 15
6.1.1 Baseboard power connector.............................................................................................................. 15
6.1.2 Processor Power Connector.............................................................................................................. 15
6.1.3 +12V4 Baseboard Power Connector .................................................................................................16
6.1.4 Peripheral Power Connectors............................................................................................................ 16
6.1.5 Floppy Power Connector ................................................................................................................... 17
6.1.6 Serial ATA Power Connector............................................................................................................. 18
6.1.7 Server Signal Connector.................................................................................................................... 19
6.1.8 Workstation Power Connector for High Power Graphics Cards........................................................ 19
6.2 Grounding.................................................................................................................................................. 20
6.3 Remote Sense .......................................................................................................................................... 20
6.4 Output Power/Currents ............................................................................................................................. 20
6.4.1 Standby Outputs ................................................................................................................................ 27
6.5 Voltage Regulation.................................................................................................................................... 27
6.6 Dynamic Loading ...................................................................................................................................... 28
6.7 Capacitive Loading.................................................................................................................................... 28
6.8 Ripple / Noise............................................................................................................................................ 28
6.9 Timing Requirements ................................................................................................................................ 29
7 Protection Circuits...................................................................................................................................... 33
7.1 Current Limit.............................................................................................................................................. 33
7.2 240VA Protection ...................................................................................................................................... 33
7.3 Over Voltage Protection ............................................................................................................................ 34
7.4 Over Temperature Protection.................................................................................................................... 34
8 Control and Indicator Functions ............................................................................................................... 35
8.1 PSON# ...................................................................................................................................................... 35
8.2 PWOK (Power OK) ................................................................................................................................... 36
8.3 SMBus Communication............................................................................................................................. 36
8.4 Power Supply Management Interface....................................................................................................... 36
8.5 Field Replacement Unit (FRU) Signals ..................................................................................................... 37
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EPS12V Power Supply Design Guide, V2.8
8.5.1
FRU Data ........................................................................................................................................... 37
8.5.2 FRU Data Format............................................................................................................................... 37
9 MTBF ............................................................................................................................................................ 38
10 Agency Requirements................................................................................................................................ 39
Figures
Figure 1: Enclosure Drawing .................................................................................................................................... 9
Figure 2 System Airflow Impedance........................................................................................................................ 10
Figure 3 Cross Loading Graph for 550W Configuration.......................................................................................... 21
Figure 4 Cross Loading Graph for 600W Configuration.......................................................................................... 22
Figure 5 Cross Loading Graph for 650W Configuration.......................................................................................... 23
Figure 6 Cross Loading Graph for 700W Configuration.......................................................................................... 24
Figure 7 750W Cross loading graph........................................................................................................................ 25
Figure 8 Cross Loading Graph for 800W Configuration.......................................................................................... 26
Figure 9: Output Voltage Timing............................................................................................................................. 30
Figure 10: Turn On/Off Timing (Single Power Supply)........................................................................................... 32
Figure 11: PSON# Signal Characteristics .............................................................................................................. 35
Tables
Table 1 Recommended Acoustic Sound Power Levels .......................................................................................... 10
Table 2: Thermal Requirements ............................................................................................................................. 11
Table 3: AC Input Rating ........................................................................................................................................ 12
Table 4: Efficiency .................................................................................................................................................. 13
Table 5 Efficiency Loading Table .............................................................................. Error! Bookmark not defined.
Table 6: AC Line Sag Transient Performance........................................................................................................ 14
Table 7: AC Line Surge Transient Performance .................................................................................................... 14
Table 8: P1 Baseboard Power Connector.............................................................................................................. 15
Table 9: Processor Power Connector..................................................................................................................... 16
Table 10: Peripheral Power Connectors................................................................................................................. 17
Table 11: Floppy Power Connector........................................................................................................................ 17
Table 12: Floppy Power Connector ....................................................................................................................... 18
Table 13: Server Signal Connector ........................................................................................................................ 19
Table 14 PCI Express Graphic Card Power Connector .......................................................................................... 19
Table 15: 550 W Load Ratings ............................................................................................................................... 21
Table 16: 600 W Load Ratings ............................................................................................................................... 22
Table 17: 650 W Load Ratings ............................................................................................................................... 23
Table 18: 700 W Load Ratings ............................................................................................................................... 24
Table 19: 750W Load Ratings ................................................................................................................................ 25
Table 20: 800 W Load Ratings ............................................................................................................................... 26
Table 21: Voltage Regulation Limits....................................................................................................................... 27
Table 22: Optional +5V Regulation Limits .............................................................................................................. 27
Table 23: Transient Load Requirements ................................................................................................................ 28
Table 24: Capacitive Loading Conditions............................................................................................................... 28
Table 25: Ripple and Noise .................................................................................................................................... 29
Table 26: Output Voltage Timing............................................................................................................................ 30
Table 27: Turn On/Off Timing................................................................................................................................. 31
Table 28: Over Current Protection.......................................................................................................................... 33
Table 29: Over Current Limits ................................................................................................................................ 34
Table 30: Over Voltage Limits ................................................................................................................................ 34
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Table 31: PSON
Table 32: PWOK Signal Characteristics................................................................................................................. 36
Table 33: FRU Device Information ......................................................................................................................... 37
Table 34: FRU Device Product Information Area ................................................................................................... 37
Table 35: MultiRecord information Area................................................................................................................. 38
#
Signal Characteristic .................................................................................................................. 35
EPS12V Power Supply Design Guide, V2.8
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EPS12V Power Supply Design Guide, V2.8
1

Purpose

This specification defines a non-redundant power supply that supports entry server computer systems. Recommendations for 550 W, 600 W, 650 W, 700W, 750W, and 800W power supplies with 8 outputs (3.3 V, 5 V, 12V1, 12V2, 12V3, 12V4, -12 V, and 5 VSB) are provided. The form factor is based on the PS/2 power supply, with three enclosure lengths defined to support various output power levels. Connector/cable assemblies are required for the motherboard power, remote sensing, control functions, and peripheral power. Because of its connector leads, the entry-level power supply is not intended to be a hot swap type of power supply. The cooling fan should meet the acoustical requirements for the system, while providing system cooling.
The parameters of this supply are defined in this specification for open industry use.
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
NOTES
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 +12V rail may be separated into three +12V rails to meet regulatory requirements for energy hazards (240VA).
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EPS12V Power Supply Design Guide, V2.8

3 Definitions/Terms/Acronyms

Required
Recommended
Optional
Autoranging
CFM
Dropout
Latch Off
Monotonically
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
Noise
Overcurrent
PFC
Ripple
Rise Time
Sag
Surge
VSB or Standby Voltage
MTBF
PWOK
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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EPS12V Power Supply Design Guide, V2.8

4 Mechanical Overview

STATUS
Required
Three enclosure size options are defined to accommodate various power levels. Recommended power levels for each enclosure length are shown below. Refer to Figure 1 for details. The two rear mounting tabs on the enclosure are OPTIONAL and may not be required for many systems.
Length Recommended power levels
140mm < 450W
180mm 450W to 750W
230mm > 800W
Top View
12 mm
55 mm
Optional mounting tab Optional mounting tab
130 mm
11 mm
16 mm
Length + 6mm
146 mm
110 mm
97.2 mm
Airflow
Label Area
Up
150 mm
138 mm
Warning Label
AC Inlet
15 mm
86 mm
6x32 THREADED HOLE (4x)
74 mm
Length
0 m 14 m
6 mm 114 mm
Figure 1: Enclosure Drawing
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EPS12V Power Supply Design Guide, V2.8
4.1 Acoustic Requirements
STATUS
Recommended
It is recommended the power supply 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 35ºC 40ºC 45ºC
% Loading 40% 60% 100%
Sound Power (BA) 4.0 4.7 6.0
4.2 Airflow Requirements
STATUS
Recommended
It is recommended the power supply have no less than 14 CFM of airflow to provide proper airflow to system components. 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
0.6
0.5
0.4
0.3
0.2
(in H2O)
0.1
System Pressure
0
System Flow Impedance
0 10203040
Power Sup ply Airflow (CFM)
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EPS12V Power Supply Design Guide, V2.8
4.3 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 2. All airflow shall pass through the power supply and not over the exterior surfaces of the power supply.
ITEM DESCRIPTION MIN MAX UNITS
) from the inlet to the outlet of the power supply shall not exceed the values shown
ps
Table 2: Thermal Requirements
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 45 °C
Non-operating temperature range. -40 70 °C
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EPS12V Power Supply Design Guide, V2.8

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 3: 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 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 5.2 shall not cause damage to the power supply.
5.4 Efficiency
STATUS
Recommended / Required
The following table provides recommended and required minimum efficiency levels. These are provided at three different load levels; 100%, 50% and 20%. The “required” minimum efficiency levels are for the purpose of proper power supply cooling when installed in the system. The “recommended” minimum efficiency levels are for the
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EPS12V Power Supply Design Guide, V2.8
purpose of reducing the system’s AC power consumption. The efficiency is specified at 50% and 20% loading conditions to help reduce system power consumption at typical system loading conditions.
Efficiency shall be tested at AC input voltages of 115VAC and 230VAC. Refer to www.efficientpowersupplies.org for details on proper efficiency testing methods.
Table 4: Efficiency
Loading 100% of maximum 50% of maximum 20% of maximum
Required minimum 70% 72% 65%
Recommended minimum 77% 80% 75%
5.5 AC Line Dropout
STATUS
Required
An AC line dropout is defined to be when the AC input drops to 0 VAC at any phase of the AC line for any length of time. During an AC dropout of one cycle or less the power supply must meet dynamic voltage regulation requirements over the rated load. An AC line dropout of one cycle or less shall not cause any tripping of control signals or protection circuits. If the AC dropout lasts longer than one cycle, the power supply should recover and meet all turn on requirements. The power supply must meet the AC dropout requirement over rated AC voltages, frequencies, and 75% or less of the rated output loading conditions. Any dropout of the AC line shall not cause damage to the power supply.
5.6 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 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.
5.7 AC Inrush
STATUS
Required
The power supply must meet inrush requirements for any rated AC voltage, during turn on at any phase of AC voltage, during a single cycle AC dropout condition, during repetitive ON/OFF cycling of AC, and over the specified temperature range (T (including input fuse, bulk rectifiers, and surge limiting device).
STATUS
). The peak inrush current shall be less than the ratings of its critical components
op
Recommended
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EPS12V Power Supply Design Guide, V2.8
An additional inrush current limit is recommended for some system applications that require multiple systems on a single AC circuit. AC line inrush current shall not exceed 50 A peak for one-quarter of the AC cycle, after which, the input current should be no more than the specified maximum input current from Table 3.
5.8 AC Line Transient Specification
STATUS
Recommended
AC line transient conditions shall be defined as “sag” and “surge” conditions. Sag conditions (also referred to as “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.
Table 5: AC Line Sag Transient Performance
AC Line Sag
Duration Sag Operating AC Voltage Line Frequency Performance Criteria
Continuous 10% Nominal AC Voltage ranges 50/60 Hz No loss of function or performance
0 to 1 AC cycle
>1 AC cycle >10% Nominal AC Voltage ranges 50/60 Hz Loss of function acceptable, self
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 cycle
100% Nominal AC Voltage ranges 50/60 Hz No loss of function or performance
recoverable
Table 6: AC Line Surge Transient Performance
AC Line Surge
30% Mid-point of nominal AC
Voltages
50/60 Hz No loss of function or performance
5.9 AC Line Fast Transient Specification
STATUS
Recommended
The power supply shall meet the EN61000-4-5 directive and any additional requirements in IEC1000-4-5:1995 and the Level 3 requirements for surge-withstand capability, with the following conditions and exceptions:
• These input transients must not cause any out-of-regulation conditions, such as overshoot and undershoot, nor must it cause any nuisance trips of any of the power supply protection circuits.
• The surge-withstand test must not produce damage to the power supply.
• The supply must meet surge-withstand test conditions under maximum and minimum DC-output load
conditions.
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EPS12V Power Supply Design Guide, V2.8

6 DC Output Specification

6.1 Output Connectors
The power supply shall have the following output connectors.

6.1.1 Baseboard power connector

STATUS
Required
Connector housing: 24-Pin Molex 39-01-2240 or equivalent
Contact: Molex
Pin Signal 18 AWG Color Pin Signal 18 AWG Color
1
2 +3.3 VDC Orange 14 -12 VDC Blue
3 COM Black 15 COM Black
4 +5 VDC Red 16 PS_ON Green
5 COM Black 17 COM Black
6 +5 VDC Red 18 COM Black
7 COM Black 19 COM Black
8 PWR OK Gray 20 Reserved (-5 V in
9 5 VSB Purple 21 +5 VDC Red
10 +12 V3
11 +12 V3
12 +3.3 VDC Orange 24 COM Black
44476-1111 or equivalent
Table 7: P1 Baseboard Power Connector
+3.3 VDC1 Orange
2
Yellow/Blue Stripe 22 +5 VDC Red
2
Yellow/Blue Stripe 23 +5 VDC Red
13 +3.3 VDC Orange
N.C.
ATX)
1. 3.3V remote sense signal double crimped with 3.3V contact.
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 (yellow).
6.1.2 Processor Power Connector
STATUS
Required
Connector housing: 8-Pin Molex 39-01-2080 or equivalent
Contact: Molex 44476-1111 or equivalent
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EPS12V Power Supply Design Guide, V2.8
Table 8: Processor Power Connector
Pin Signal 18 AWG color Pin Signal 18 AWG Color
1 COM Black 5 +12 V1 Yellow/Black Stripe
2 COM Black 6 +12 V1 Yellow/Black Stripe
3 COM Black 7 +12 V2 Yellow
4 COM Black 8 +12 V2 Yellow
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).

6.1.3 +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 this 2x2 connector.
Connector housing: 4-Pin Molex 39-01-2040 or equivalent
Contact: Molex
Pin Signal 18 AWG color Pin Signal 18 AWG Color
1 COM Black 3 +12 V4 Yellow/Green Stripe
2 COM Black 4 +12 V4 Yellow/Green Stripe
44476-1111 or equivalent
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
6.1.4 Peripheral Power Connectors
STATUS
Required
Connector housing: Amp 1-480424-0 or equivalent
Contact: Amp 61314-1 contact or equivalent
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EPS12V Power Supply Design Guide, V2.8
Table 9: Peripheral Power Connectors
Pin Signal 18 AWG Color
1 +12V4 Yellow/Green stripe
2 COM Black
3 COM Black
4 +5 VDC Red
1. The +12V power to peripherals may be split between the second, third, or fourth +12V channel for the purpose of
limiting power to less than 240VA.
2. If 240VA limiting is not a requirement, all +12V outputs are common and may have the same wire color.

6.1.5 Floppy Power Connector

STATUS
Required
Connector housing: Amp 171822-4 or equivalent
Table 10: Floppy Power Connector
Pin Signal 22 AWG Color
1 +5 VDC Red
2 COM Black
3 COM Black
4 +12V4 Yellow/Green Stripe
1. The +12V power to peripherals may be split between the second, third, or fourth +12V channel for the purpose of
limiting power to less than 240VA.
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.
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EPS12V Power Supply Design Guide, V2.8

6.1.6 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 AT Attachment “ specification at www.serialata.org
Molex Housing #675820000
Molex Terminal #67510000
Table 11: Floppy Power Connector
Pin Signal 18 AWG Color
5 +3.3VDC Orange
4 COM Black
3 +5VDC Red
2 COM Black
.
1 +12V4 Yellow/Green Stripe
Serial ATA Connector
5
4 3 2 1
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EPS12V Power Supply Design Guide, V2.8

6.1.7 Server Signal Connector

STATUS
Optional
For server systems with SMBus features, the power supply may have an additional connector, which provides serial SMBus for FRU data and remote sense on 3.3V and Return.
If the optional server signal connector is not used on the power supply or the connector is unplugged, the power supply shall utilize the 3.3RS on the baseboard connector (Pin 1).
Connector housing: 5-pin Molex 50-57-9405 or equivalent
Contacts: Molex 16-02-0088 or equivalent
Table 12: Server Signal Connector
Pin Signal 24 AWG Color
1 SMBus Clock White/Green Stripe
2 SMBus Data White/Yellow Stripe
3 SMBAlert White
4 ReturnS Black/White Stripe
5 3.3RS Orange/White Stripe

6.1.8 Workstation Power Connector for High Power Graphics Cards

STATUS
Optional
For workstation systems with high-powered graphics cards an additional power connector to the baseboard may be needed. This connector supplies additional +12V power for the higher power level graphics cards used in workstation applications.
Connector housing: 6-pin Molex 45559-0002 or equivalent
Contacts: Molex 39-00-0207 or equivalent
PIN SIGNAL 18 AWG Colors PIN SIGNAL 18 AWG Colors
1 +12V4 Yellow/Green Stripe 4 COM Black 2 +12V4 Yellow/Green Stripe 5 COM Black 3 +12V4 Yellow/Green Stripe 6 COM Black
Table 13 PCI Express Graphic Card Power Connector
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EPS12V Power Supply Design Guide, V2.8
6.2 Grounding
STATUS
Required
The ground of the pins of the power supply 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 supply may have remote sense for the +3.3V (3.3VS) and return (ReturnS) if the Optional Server Signal connector is implemented. The remote sense return (ReturnS) is used to regulate out ground drops for all output voltages; +3.3V, +5 V, +12V1, +12V2, +12V3, -12 V, and 5 VSB. The 3.3V remote sense (3.3VS) is used to regulate out drops in the system for the +3.3 V output. The remote sense input impedance to the power supply must be greater than 200 W on 3.3 VS and ReturnS. This is the value of the resistor connecting the remote sense to the output voltage internal to the power supply. Remote sense must be able to regulate out a minimum of 200 mV drop on the +3.3 V output. The remote sense return (ReturnS) must be able to regulate out a minimum of 200 mV drop in the power ground return. The current in any remote sense line shall be less than 5 mA to prevent voltage sensing errors. The power supply must operate within specification over the full range of voltage drops from the power supply’s output connector to the remote sense points.
6.4 Output Power/Currents
STATUS
Recommended
The following tables define power and current ratings for four recommended power levels selected to cover different types of systems and configurations.
The combined output power of all outputs shall not exceed the rated output power. Load ranges are provided for each output level. The power supply must meet both static and dynamic voltage regulation requirements for the minimum loading conditions.
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EPS12V Power Supply Design Guide, V2.8
Table 14: 550 W Load Ratings
Voltage Minimum Continuous Maximum Continuous Peak
+3.3 V 1.5 A 24 A
+5 V 1.0 A 24 A
+12V1 0.5 A 11.5 A 14.5 A
+12V2 0.5 A 11.5 A 14.5 A
+12V3 1.0 A 14 A
+12V4 0.5 A 8.0 A 13 A
-12 V 0 A 0.5 A
+5 VSB 0.1 A 3.0 A 3.5 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 660 W.
4. Peak power and current loading shall be supported for a minimum of 12 second.
5. Maximum combined current for the 12 V outputs shall be 41 A.
6. Peak current for the combined 12 V outputs shall be 50 A.
Figure 3 Cross Loading Graph for 550W Configuration
160
140
120
100
80
60
40
5V + 3.3V power (W)
20
0
0 50 100 150 200 250 300 350 400 450 500 550
+12V pow er (W)
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EPS12V Power Supply Design Guide, V2.8
Table 15: 600 W Load Ratings
Voltage Minimum Continuous Maximum Continuous Peak
+3.3 V 1.5 A 24 A
+5 V 1.0 A 24 A
+12V1 0.5 A 16 A 18 A
+12V2 0.5 A 16 A 18 A
+12V3 1.0 A 16 A 18 A
+12V4 0.5 A 16 A 18 A
-12 V 0 A 0.5 A
+5 VSB 0.1 A 3.0 A 3.5 A
1. Maximum continuous total DC output power should not exceed 600 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 680 W.
4. Peak power and current loading shall be supported for a minimum of 12 second.
5. Maximum combined current for the 12 V outputs shall be 48 A.
6. Peak current for the combined 12 V outputs shall be 54 A.
Figure 4 Cross Loading Graph for 600W Configuration
160
140
120
100
80
60
40
5V + 3.3V power (W)
20
0
0 50 100 150 200 250 300 350 400 450 500 550 600
+12V p ow er ( W)
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EPS12V Power Supply Design Guide, V2.8
Table 16: 650 W Load Ratings
Voltage Minimum Continuous Maximum Continuous Peak
+3.3 V 1.5 A 24 A
+5 V 1.0 A 24 A
+12V1 0.8 A 16 A 18 A
+12V2 0.8 A 16 A 18 A
+12V3 0.5 A 16 A 18 A
+12V4 1.0 A 16 A 18 A
-12 V 0 A 0.5 A
+5 VSB 0.1 A 3.0 A 3.5 A
1. Maximum continuous total DC output power should not exceed 650 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 730 W.
4. Peak power and current loading shall be supported for a minimum of 12 second.
5. Maximum combined current for the 12 V outputs shall be 52 A.
6. Peak current for the combined 12 V outputs shall be 58 A.
Figure 5 Cross Loading Graph for 650W Configuration
160
140
120
100
80
60
40
5V + 3.3V power (W)
20
0
0 50 100 150 200 250 300 350 400 450 500 550 600
+12V powe r (W)
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Table 17: 700 W Load Ratings
Voltage Minimum Continuous Maximum Continuous Peak
+3.3 V 1.5 A 24 A
+5 V 1.0 A 24 A
+12V1 0.8 A 16 A 18 A
+12V2 0.8 A 16 A 18 A
+12V3 0.5 A 16 A 18 A
+12V4 1.0 A 16 A 18 A
-12 V 0 A 0.5 A
+5 VSB 0.1 A 3.0 A 3.5 A
1. Maximum continuous total DC output power should not exceed 700 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 780 W.
4. Peak power and current loading shall be supported for a minimum of 12 second.
5. Maximum combined current for the 12 V outputs shall be 56 A.
6. Peak current for the combined 12 V outputs shall be 62 A.
Figure 6 Cross Loading Graph for 700W Configuration
160
140
120
100
80
60
40
5V + 3.3V power (W)
20
0
0 50 100 150 200 250 300 350 400 450 500 550 600 650
+12V power (W)
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EPS12V Power Supply Design Guide, V2.8
Table 18: 750W Load Ratings
Voltage Minimum Maximum Peak
+3.3 V 1.5 A 24 A
+5 V 1.0 A 24 A
+12 V1 0.8 A 16 A 18 A
+12 V2 0.8 A 16 A 18 A
+12 V3 0.5 A 16 A 18 A
+12 V4 1.0 A 18 A 22 A7
-12 V 0 A 0.5 A
+5 VSB 0.1 A 3.0 A 3.5 A
1. Maximum continuous total DC output power should not exceed 750 W.
2. Peak load on the combined 12 V output shall not exceed 66A.
3. Maximum continuous load on the combined 12 V output shall not exceed 60 A.
4. Peak total DC output power should not exceed 850 W.
5. Peak power and current loading shall be supported for a minimum of 12 seconds.
6. Combined 3.3V and 5V power shall not exceed 140W.
7. Peak current on 12V4 shall be supported for a minimum of 0.5 seconds.
Figure 7 750W Cross loading graph
160
140
120
100
80
60
40
5V + 3.3V power (W)
20
0
0 50 100 150 200 250 300 350 400 450 500 550 600 650 700
+12V power (W)
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EPS12V Power Supply Design Guide, V2.8
Table 19: 800 W Load Ratings
Voltage Minimum Continuous Maximum Continuous Peak
+3.3 V 0.8 A 24 A
+5 V 0.5 A 24 A
+12V1 0 A 16 A 18 A
+12V2 0 A 16 A 18 A
+12V3 0.9 A 16 A 18 A
+12V4 0.1 A 18 A 22 A7
-12 V 0 A 0.5 A
+5 VSB 0.1 A 3.0 A 3.5 A
1. Maximum continuous total DC output power should not exceed 800 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 880 W.
4. Peak power and current loading shall be supported for a minimum of 12 second.
5. Maximum combined current for the 12 V outputs shall be 64 A.
6. Peak current for the combined 12 V outputs shall be 70 A.
7. Peak power on the +12V4 rail shall be sustained for a minimum of 500msec.
Figure 8 Cross Loading Graph for 800W Configuration
160
140
120
100
80
60
40
5V + 3.3V power (W)
20
0
05010015020025030035040045050055060065070075
0
+12V power (W)
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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.
6.5 Voltage Regulation
STATUS
Required
The power supply output voltages must stay within the following voltage limits when operating at steady state and dynamic loading conditions. These limits include the peak-peak ripple/noise specified in Section 6.8. All outputs are measured with reference to the return remote sense (ReturnS) signal. The 5 V, 12V1, 12V2, 12V3, –12 V and 5 VSB outputs are measured at the power supply connectors referenced to ReturnS. The +3.3 V is measured at it remote sense signal (3.3VS) located at the signal connector.
Table 20: Voltage Regulation Limits
Parameter MIN NOM MAX Units Tolerance
+3.3 V +3.20 +3.30 +3.46 V
+5 V +4.80 +5.00 +5.25 V
+12V1 +11.52 +12.00 +12.60 V
+12V2 +11.52 +12.00 +12.60 V
+12V3 +11.52 +12.00 +12.60 V
+12V4 +11.52 +12.00 +12.60 V
-12 V -11.40 -12.20 -13.08 V
+5 VSB +4.85 +5.00 +5.25 V
+5/-3%
rms
+5/-4%
rms
+5/-4%
rms
+5/-4%
rms
+5/-4%
rms
+5/-4%
rms
+9/-5%
rms
+5/-3%
rms
STATUS
Optional
Some system applications may require tighter regulation limits on the +5 V and +12V outputs. The optional regulation limits are shown below.
Table 21: Optional +5V Regulation Limits
Parameter MIN NOM MAX Units Tolerance
+5 V +4.85 +5.00 +5.25 V
+12V1,2,3,4 +11.64 +12.00 +12.60 V
+5/-3%
rms
+5/-3%
rms
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EPS12V Power Supply Design Guide, V2.8
6.6 Dynamic Loading
STATUS
Required
The output voltages shall remain within the limits specified in for the step loading and within the limits specified in for the capacitive loading specified in below. The load transient repetition rate shall be tested between 50 Hz and 5 kHz at duty cycles ranging from 10%-90%. The load transient repetition rate is only a test specification. The ∆ step load may occur anywhere within the MIN load to the MAX load range.
Table 22
Table 22: Transient Load Requirements
Output
+3.3 V 30% of max load 0.5 A/µs 1000 µF
+5 V 30% of max load 0.5 A/µs 1000 µF
12V1+12V2+12V3+12V4 65% of max load 0.5 A/µs 2200 µF
+5 VSB 25% of max load 0.5 A/µs 1 µF
∆ Step Load Size
Table 20
Load Slew Rate Capacitive Load
6.7 Capacitive Loading
STATUS
Required
The power supply shall be stable and meet all requirements with the following capacitive loading ranges.
Table 23: Capacitive Loading Conditions
Output MIN MAX Units
+3.3 V 10 12,000 µF
+5 V 10 12,000 µF
+12 V 10 11,000 µF
-12 V 1 350 µF
+5 VSB 1 350 µF
6.8 Ripple / Noise
STATUS
Required
The maximum allowed ripple/noise output of the power supply is defined in . This is measured over a bandwidth of 0 Hz to 20 MHz at the power supply output connectors. A 10 µF tantalum capacitor in parallel with a
0.1 µF ceramic capacitor are placed at the point of measurement.
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Table 24
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EPS12V Power Supply Design Guide, V2.8
Table 24: Ripple and Noise
+3.3 V +5 V +12 V -12 V +5 VSB
50 mVp-p 50 mVp-p 120 mVp-p 120 mVp-p 50 mVp-p
6.9 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 regulation limits within 1 to 25ms. The +3.3 V, +5 V and +12 V output voltages should start to rise at about the same time. All outputs must rise monotonically. The +5 V output needs to be greater than the +3.3 V output during any point of the voltage rise. The +5V output must never be greater than the +3.3V output by more than
2.25 V. Each output voltage shall reach regulation within 50 ms (T supply. Each output voltage shall fall out of regulation within 400 ms (T
and show the turn ON and turn OFF timing requirements. In Figure 10 the timing is shown with both
9 Figure 10 AC and PSON# controlling the ON/OFF of the power supply.
) within 5 to 70 ms; except for 5VSB which is required to rise from 10% to
vout_rise
) of each other during turn on of the power
vout_on
) of each other during turn off.
vout_off
Figure
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EPS12V Power Supply Design Guide, V2.8
Table 25: Output Voltage Timing
Item Description MIN MAX Units
T
Ouput voltage rise time for the 5VSB output. 1 25 ms
T
T
Output voltage rise time from each main output. 5 70 ms
vout_rise
All main outputs must be within regulation of each
vout_on
other within this time.
All main outputs must leave regulation within this
vout_off
time.
50 ms
400 Ms
V1
V2
V3
10% Vout
T
vout_rise
T
vout_on
Figure 9: Output Voltage Timing
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T
vout_off
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EPS12V Power Supply Design Guide, V2.8
Table 26: Turn On/Off Timing
Item Description MIN MAX UNITS
T
T
T
T
T
T
T
T
T
T
sb_on_delay
Delay from AC being applied to 5 VSB being within
regulation.
ac_on_delay
Delay from AC being applied to all output voltages being
within regulation.
vout_holdup
Time all output voltages stay within regulation after loss
of AC. Tested at 75% of maximum load and over 100­240VAC input.
pwok_holdup
Delay from loss of AC to deassertion of PWOK. Tested
at 75% of maximum load and over 100-240VAC input.
pson_on_delay
Delay from PSON# active to output voltages within
regulation limits.
pson_pwok
pwok_on
Delay from PSON# deactive to PWOK being deasserted. 50 ms
Delay from output voltages within regulation limits to
PWOK asserted at turn on.
Delay from PWOK deasserted to output voltages (3.3 V,
pwok_off
5 V, 12 V, -12 V) dropping out of regulation limits.
Duration of PWOK being in the deasserted state during
pwok_low
an off/on cycle using AC or the PSON# signal.
Delay from 5 VSB being in regulation to O/Ps being in
sb_vout
regulation at AC turn on.
1500 ms
2500 ms
18 ms
17 ms
5 400 ms
100 500 ms
1 ms
100 ms
50 1000 ms
STATUS
Recommended
Item Description MIN MAX UNITS
T
vout_holdup
T
pwok_holdup
T
sb_holdup
Time all output voltages stay within regulation
21 ms
after loss of AC.
Delay from loss of AC to deassertion of PWOK. 20 ms
Time 5VSB output voltage stays within regulation
70 ms
after loss of AC.
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sb ondela
y
EPS12V Power Supply Design Guide, V2.8
PWOK
5VSB
PSON#
T
sb_on_delay
T
AC_on_delay
T
sb_vout
AC turn on/off cycle
vout_holdup
T
pwok_off
T
pwok_low
T
T
pson_pwok
pwok_off
T
T
pson_on_delay
pwok_on
T
PSON turn on/off cycle
T
T
pwok_on
T
pwok_holdup
Tsb_holdup
Figure 10: Turn On/Off Timing (Single Power Supply)
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EPS12V Power Supply Design Guide, V2.8

7 Protection Circuits

STATUS
Required
Protection circuits inside the power supply shall cause only the power supply’s main outputs to shutdown. If the power supply latches off due to a protection circuit tripping, an AC cycle OFF for 15 s and a PSON# cycle HIGH for 1 second must be able to reset the power supply.
7.1 Current Limit
STATUS
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 27. 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. -12 V and 5 VSB shall be protected under over current or shorted conditions so that no damage can occur to the power supply. All outputs shall be protected so that no damage occurs to the power supply under a shorted output condition.
#
signal or by an AC power interruption. The power supply shall not be
Table 27: Over Current Protection
Voltage Over Current Limit (Iout limit)
+3.3 V 110% minimum; 150% maximum
+5 V 110% minimum; 150% maximum
+12V 110% minimum; 150% maximum
7.2 240VA Protection
STATUS
Recommended
System designs may require user access to energized areas of the system. In these cases the power supply may be required to meet regulatory 240VA energy limits for any power rail. Since the +12V rail combined power exceeds 240VA it must be divided into separate channels to meet this requirement. Each separate rail needs to be limited to less than 20A for each +12V rail. The separate +12V rails do not necessarily need to be independently regulated outputs. They can share a common power conversion stage. The +12V rail is split into four rails. Refer to section 6.4 for how the 12V rail is split between different output connectors.
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Table 28: Over Current Limits
Voltage Over Current Limit (Iout limit)
+3.3 V 110% minimum; 150% maximum
+5 V 110% minimum; 150% maximum
+12V1 Peak current minimum; 20A maximum
+12V2 Peak current minimum; 20A maximum
+12V3 Peak current minimum; 20A maximum
+12V4 Peak current minimum; 20A maximum
+12V4 (750W-800W) Peak current minimum; 22A maximum1
1. +12V4 peak current for the 750W and 800W power supplies shall be maintained for a minimum of 500msec. The maximum
duration of the peak current exceeding the 240VA limit should be limited to meet safety regulations. A maximum duration of 1 second is recommended.
7.3 Over Voltage Protection
STATUS
Required
The power supply over voltage protection shall be locally sensed. The power supply shall shutdown and latch off after an over voltage condition occurs. This latch shall be cleared by toggling the PSON# signal or by an AC power interruption. Table 29 contains the over voltage limits. The values are measured at the output of the power supply’s connectors. 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.
Table 29: Over Voltage Limits
Output Voltage MIN (V) MAX (V)
+3.3 V 3.9 4.5
+5 V 5.7 6.5
+12V1,2,3,4 13.3 14.5
-12 V -13.3 -14.5
+5 VSB 5.7 6.5
7.4 Over Temperature Protection
STATUS
Recommended
The power supply will be protected against over temperature conditions caused by loss of fan cooling or excessive ambient temperature. In an OTP condition the PSU will shutdown. When the power supply temperature drops to within specified limits, the power supply shall restore power automatically. The OTP circuit
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EPS12V Power Supply Design Guide, V2.8
must have built in hysteresis such that the power supply will not oscillate on and off due to temperature recovering condition. The OTP trip level shall have a minimum of 4 °C of ambient temperature hysteresis.
8

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
8.1 PSON#
The PSON# signal is required to remotely turn on/off the power supply. PSON# is an active low signal that turns on the +3.3 V, +5 V, +12 V, and -12 V power rails. When this signal is not pulled low by the system, or left open, the outputs (except the +5 VSB) turn off. This signal is pulled to a standby voltage by a pull-up resistor internal to the power supply. Refer to Figure 10 for timing diagram.
= low true
STATUS
Required
Table 30: PSON# Signal Characteristic
Signal Type
PSON# = Low
PSON# = Open or High
Accepts an open collector/drain input from the system. Pull-up to VSB located in power supply.
ON
OFF
MIN MAX
Logic level low (power supply ON)
Logic level high (power supply OFF)
Source current, Vpson = low
Power up delay: T
PWOK delay: T
pson_on_delay
pson_pwok
0 V 1.0 V
2.0 V 5.25 V
4 mA
5 ms 400 ms
50 ms
Disabled
Hysteresis ≥ 0.3V and/or other de-bounce method
≤ 1.0 V
PS is
enabled
≥ 2.0 V
PS is
disabled
Enabled
0V
1.0V
2.0V
5.25V
Figure 11: PSON# Signal Characteristics
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EPS12V Power Supply Design Guide, V2.8
8.2 PWOK (Power OK)
STATUS
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 deasserted to a LOW state. See Figure 10 for a representation of the timing characteristics of PWOK. The start of the PWOK delay time shall be inhibited as long as any power supply output is in current limit.
Table 31: PWOK Signal Characteristics
Signal Type
PWOK = High
PWOK = Low
MIN MAX
Logic level low voltage, Isink = 4 mA
Logic level high voltage, Isource=200 µA
PWOK delay: T
PWOK rise and fall time
Power down delay: T
pwok_on
pwok_off
+5V TTL Compatible output signal
Power OK
Power Not OK
0 V 0.4 V
2.4 V 5.25 V
200 ms 1000 ms
100 µs
1 ms
8.3 SMBus Communication
STATUS
Optional
The serial bus communication devices for PSMI and FRU data in the power supply shall be compatible with both SMBus 2.0 ‘high power’ and I2C Vdd based power and drive. This bus shall operate at 3.3V but tolerant of 5V signaling. The SMBus pull-ups are located on the motherboard and may be connected to 3.3V or 5V.
Two pins are allocated on the power supply. One pin is the Serial Clock (PSM Clock). The second pin is used for Serial Data (PSM Data). Both pins are bi-directional and are used to form a serial bus. The circuits inside the power supply shall derive their power from the 5VSB bus. No pull-up resistors shall be on SCL or SDA inside the power supply. These pull-up resistors should be located external to the power supply.
8.4 Power Supply Management Interface
STATUS
Optional
The PSMI device in the power supply shall derive its power off of the 5VSB output and grounded to ReturnS. It shall be located at address B0h. Refer to the PSMI specification posted on the www.ssiforum.org
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EPS12V Power Supply Design Guide, V2.8
details on the Power Supply Monitoring Interface requirements. PSMI is a SMBus interface used to communicate power management information to the system.
8.5 Field Replacement Unit (FRU) Signals
STATUS
Optional
The FRU circuits inside the power supply must be powered off of 5 VSB output and grounded to ReturnS (remote sense return). The Write Control (or Write protect) pin should be tied to ReturnS inside the power supply so that information can be written to the EEPROM.
8.5.1 FRU Data
FRU data shall be stored starting in address location 8000h through 80FFh. The FRU data format shall be compliant with the IPMI specifications. The current versions of these specifications are available at:
http:\\developer.intel.com/design/servers/ipmi/spec.htm

8.5.2 FRU Data Format

Table 32: FRU Device Information
.
Area Type Description
Common Header As defined by the FRU document
Internal Use Area Not required, do not reserve
Chassis Info Area Not applicable, do not reserve
Board Info Area Not applicable, do not reserve
8.5.2.1 Product Info Area
Implement as defined by the IPMI FRU document. Product information shall be defined as follows:
Table 33: FRU Device Product Information Area
Field Name Field Description
Manufacturer Name {Formal name of manufacturer}
Product Name {Manufacturer’s model number}
Product part/model number Customer part number
Product Version Customer current revision
Product Serial Number {Defined at time of manufacture}
Asset Tag {Not used, code is zero length byte}
FRU File ID {Not required}
PAD Bytes {Added as necessary to allow for 8-byte offset to next area}
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EPS12V Power Supply Design Guide, V2.8
8.5.2.2 MultiRecord Area
Implement 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.
MultiRecord information shall be defined as follows:
Table 34: MultiRecord information Area
Field Name (PS Info) Field Information Definition
Overall Capacity (watts) 550 {Low power version would be 450}
Peak VA 610 {Low power version would be 490}
Inrush current (A) 50
Inrush interval (ms) 5
Low end input voltage range 1 90
High end input voltage range 1 140
Low end input voltage range 2 180
High end input voltage range 2 264
A/C dropout tol. (ms) 20
Binary flags Set for: Hot Swap support, Autoswitch, and PFC
Peak Wattage Set for: 10 s, 610 W {Low power version would be 490 W}
Combined wattage Set for 5 V & 3.3V combined wattage of 115 W {Low power version
Predictive fail tach support Not supported, 00h value
Field Name (Output) Field Description
Five outputs are to be defined from #1 to #5, as follows: +3.3 V, +5 V, +12 V, -12V, and +5 VSB.
Output Information Set for: Standby on +5 VSB, No Standby on all others.
All other output fields Format per IPMI specification, using parameters in the EPS12V

9 MTBF

STATUS
would be 115 W}
specification.
Recommended
The power supply shall have a minimum MTBF at continuous operation of 1) 50,000 hours at 100% load and 50 °C, as calculated by Bellcore RPP, or 2) 100,000 hours demonstrated at 100% load and 50 °C.
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EPS12V Power Supply Design Guide, V2.8

10 Agency Requirements

STATUS
Recommended
The power supply must comply with all regulatory requirements for its intended geographical market. Depending on the chosen market, regulatory requirements may vary. Although a power supply can be designed for worldwide compliance, there may be cost factors that drive different versions of supplies for different geographically targeted markets.
This specification requires that the power supply meet all regulatory requirements for the intended market at the time of manufacturing. Typically this includes:
• UL
• CSA
• A Nordic CENELEC
• TUV
• VDE
• CISPR Class B
• FCC Class B
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, -11, EN61000-3-2, -3, and JEIDI MITI standard. 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. Specific immunity level requirements are left to customer requirements.
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