Intel EPS1U User Manual
SSI
EPS1U Power Supply Design Guide, V1.1
EPS1U
Power Supply Design Guide
A Server System Infrastructure (SSI) Specification
For 1U Rack Chassis Power Supplies
Version 1.1
SSI
EPS1U Power Supply Design Guide, V1.1
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 DAMAGES, 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 is subject to the terms of the S.S.I. Specification Adopter's Agreement.
Copyright Intel Corporation, NEC Corporation, Dell Computer Corporation, Data General a division of EMC Corporation, Compaq Computer
Corporation, Silicon Graphics Inc., International Business Machines Corporation, 2001.
SSI
EPS1U Power Supply Design Guide, V1.1
Contents
1 Purpose..........................................................................................................................................................5
2 Conceptual Overview....................................................................................................................................5
3 Definitions/Terms/Acronyms .......................................................................................................................6
4 Mechanical Overview....................................................................................................................................7
4.1 High Power Card Edge Form Factor...................................................................................................7
4.2 Alternate Enclosure.............................................................................................................................8
4.3 Airflow Requirements..........................................................................................................................9
4.4 Temperature Requirements ................................................................................................................9
5 AC Input Requirements ..............................................................................................................................10
5.1 AC Inlet Connector............................................................................................................................10
5.2 AC Input Voltage Specification..........................................................................................................10
5.3 Input Under Voltage ..........................................................................................................................10
5.4 Efficiency...........................................................................................................................................11
5.5 AC Line Dropout................................................................................................................................11
5.6 AC Line Fuse.....................................................................................................................................11
5.7 AC Inrush...........................................................................................................................................11
5.8 AC Line Transient Specification........................................................................................................12
5.9 AC Line Fast Transient Specification................................................................................................12
6 DC Output Specification.............................................................................................................................13
6.1 Connector..........................................................................................................................................13
6.2 Grounding..........................................................................................................................................15
6.3 Remote Sense...................................................................................................................................15
6.4 Output Power/Currents......................................................................................................................15
6.4.1 Standby Outputs ...................................................................................................................17
6.5 Voltage Regulation............................................................................................................................18
6.6 Dynamic Loading...............................................................................................................................18
6.7 Capacitive Loading............................................................................................................................19
6.8 Ripple / Noise....................................................................................................................................19
6.9 Timing Requirements........................................................................................................................20
7 Protection Circuits......................................................................................................................................23
7.1 Current Limit......................................................................................................................................23
7.2 240VA Protection ..............................................................................................................................23
7.3 Over Voltage Protection....................................................................................................................24
7.4 Over Temperature Protection............................................................................................................24
8 Control and Indicator Functions................................................................................................................25
8.1 PSON#...............................................................................................................................................25
8.2 PWOK (Power OK)............................................................................................................................26
8.3 ACWarning........................................................................................................................................27
8.4 Field Replacement Unit (FRU) Signals .............................................................................................28
8.4.1 FRU Data..............................................................................................................................28
8.4.2 FRU Data Format..................................................................................................................28
8.5 LED Indicator.....................................................................................................................................30
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EPS1U Power Supply Design Guide, V1.1
9 MTBF.............................................................................................................................................................30
10 Agency Requirements ................................................................................................................................31
Figures
Figure 1: Enclosure Drawing.....................................................................................................................................7
Figure 2: Alternate Enclosure Drawing .....................................................................................................................8
Figure 3: Edge Finger Layout..................................................................................................................................14
Figure 4: Output Voltage Timing.............................................................................................................................20
Figure 5: Turn On/Off Timing (Signal Power Supply) .............................................................................................22
Figure 6: PSON# Signal Characteristics.................................................................................................................25
Tables
Table 1: Definitions, Terms, and Acronyms (listed alphabetically) ...........................................................................6
Table 2: Thermal Requirements................................................................................................................................9
Table 3: AC Input Rating.........................................................................................................................................10
Table 4: AC Line Sag Transient Performance........................................................................................................12
Table 5: AC Line Surge Transient Performance.....................................................................................................12
Table 6: Edge Finger Pinout ...................................................................................................................................13
Table 7: 125 W Load Ratings..................................................................................................................................16
Table 8: 250 W Load Ratings..................................................................................................................................16
Table 9: 350 W Load Ratings..................................................................................................................................17
Table 10: Voltage Regulation Limits .......................................................................................................................18
Table 11: Optional +5V Regulation Limits ..............................................................................................................18
Table 12: Transient Load Requirements.................................................................................................................18
Table 13: Capacitve Loading Conditions ................................................................................................................19
Table 14: Ripple and Noise.....................................................................................................................................19
Table 15: Output Voltage Timing ............................................................................................................................20
Table 16: Turn On/Off Timing .................................................................................................................................21
Table 17: Over Current Protection..........................................................................................................................23
Table 18: Over Current Protection..........................................................................................................................23
Table 19: Over Voltage Limits.................................................................................................................................24
Table 20: PSON# Signal Characteristic...................................................................................................................25
Table 21: PWOK Signal Characteristics.................................................................................................................26
Table 22: ACWarning Signal Characteristics..........................................................................................................27
Table 23: FRU Device Information..........................................................................................................................28
Table 24: FRU Device Product Information Area....................................................................................................28
Table 25: FRU Device MultiRecord Area................................................................................................................29
Table 26: LED Indicators.........................................................................................................................................30
SSI
EPS1U Power Supply Design Guide, V1.1
1 Purpose
This specification defines a non-redundant power supply that supports 1U rack mount entry server systems. The
entry-level power supply is not intended to be a hot swap type of power supply. The parameters of this supply are
defined in this specification for open industry use. This specification defines a 125W, 250 W and 350 W power
supply with six outputs; 3.3 V, 5 V, 12 V, -12 V, and 5 VSB. The form factor fits into a 1U system and provides a
wire harness or docking solution for output connections. An IEC connector is provided on the external face for AC
input to the power supply. The power supply contains fans for cooling, while meeting acoustic requirements.
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
• 5V 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 an n+1 redundant power system or a non-redundant power system.
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EPS1U Power Supply Design Guide, V1.1
3 Definitions/Terms/Acronyms
Table 1: Definitions, Terms, and Acronyms (listed alphabetically)
Required
Recommended
Optional
Full Ranging
CFM
Dropout
Latch Off
Monotonically
MTBF
Noise
Overcurrent
PFC
PWOK
Ripple
Rise Time
Sag
Surge
VSB or Standby Voltage
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 full-ranging power supply 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.
Mean time between failure
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.
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.
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.
SSI
+/-0.2
+/-0.3
+0.2/-0.5
+/- 0.2
+0/-0.05
+/-0.3
+/-0.3
+/- 0.2
+/- 0.2
All dimensions are i
EPS1U Power Supply Design Guide, V1.1
4 Mechanical Overview
There are two physical sizes of the power supply enclosure intended to accommodate power levels of 125W,
250W and 350W. There are two output connector designs. A card edge solution to provide ease of installation
and removal and a wire harness to provide a traditional cabled solution. The chassis for the entry 1U power
supply is designed for use in 1U rack mounted systems.
4.1 High Power Card Edge Form Factor
STATUS
Large Power Form
Factor
The high power edge card form factor is intended for use at 250W and 350W power levels. Refer to Figure 1 for
details. The supply will provide its output power via a card edge on the interior face of the power supply to
provide users and manufacturers easy installation and removal of the power supply into the system.
Top View
Side View
n millimeters.
8.5
80.92
12.54
5.0
Interior Face View
Bi-Color LED
(PWR/Fail)
Fan
Exterior Face View
16.4
53.0
IEC Connector
Center Line
AC I/P
Fan
106.0
IEC Connector
IEC Connector
Center Line
300.0
62 32
1
31
Figure 1: Enclosure Drawing
SSI
+/-0.2
+0.2/-0.5
Exterior Face
+/- 0.2
+/- 0.2
+/- 0.2
All dimensions are in millimeters.
EPS1U Power Supply Design Guide, V1.1
4.2 Alternate Enclosure
STATUS
Small Power Form Factor
Systems may require a smaller power supply enclosure. Figure 2 details a smaller power supply enclosure for
such systems. This form factor accommodates power levels of 250W and 125W. The supply will provide output
power via a wire harness out the interior face of the supply. Refer to the Entry Electronics Bay Specification at
the SSI web site (http://www.ssiforum.org/docs/entry_elecbay_spec_v2_0.pdf) for possible output connector
configurations. Due to different system board layouts the wire harness length may vary.
40.0
Bi-Color LED
(PWR/Fail)
Fan
16.4
53.0
IEC Connector
Center Line
AC I/P
Fan
106.0
IEC Connector
IEC Connector
Center Line
215.0
Interior Face
Figure 2: Alternate Enclosure Drawing
SSI
EPS1U Power Supply Design Guide, V1.1
4.3 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 shall not exceed a noise level of 38 dBA measured at one meter on all
faces. At low fan speed, the power supply shall provide a minimum of 6 CFM of airflow with 0.003 inH2O of
system backpressure. At high fan speed, the power supply shall provide a minimum of 10 CFM with 0.006 inH2O
of system backpressure.
4.4 Temperature Requirements
STATUS
Recommended
The power supply shall operate within all specified limits over the Top temperature range. The average air
temperature difference (∆Tps ) from the inlet to the outlet of the power supply shall not exceed the values shown in
Table 2. All airflow shall pass through the power supply and not over the exterior surfaces of the power supply.
Table 2: Thermal Requirements
Item Description MIN MAX Units
Top Operating temperature range. 0 45
∆Tps
T
non-op
Temperature rise from inlet air to outlet air of power supply.
125 W output power, 10 CFM, Sea level, 25 °C inlet air.
125 W output power, 6 CFM, Sea level, 25 °C inlet air.
Temperature rise from inlet air to outlet air of power supply.
250 W output power, 10 CFM, Sea level, 25 °C inlet air.
250 W output power, 6 CFM, Sea level, 25 °C inlet air.
350 W output power, 10 CFM, Sea level, 25 °C inlet air.
350 W output power, 6 CFM, Sea level, 25 °C inlet air.
Non-operating temperature range. -40 70
30
15
25
20
30
40
°C
°C
°C
°C
°C
°C
°C
°C
The power supply must meet UL enclosure requirements for temperature rise limits. All sides of the power
supply, with exception to the air exhaust side, must be classified as “Handle, knobs, grips, etc. held for short
periods of time only”.
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EPS1U Power Supply Design Guide, V1.1
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 3: AC Input Rating
Parameter MIN Rated MAX MAX Input
Current
(125W)
Voltage (110) 90 V
Voltage (220) 180 V
100-127 V
rms
200-240 V
rms
140 V
rms
264 V
rms
2.4 A
rms
1.2 A
rms
rms
rms
Frequency 47 Hz 63 Hz
1. Maximum input current at low input voltage range shall be measured at 90VAC. A 125W output load shall be applied to the
125W version, a 250 W output load shall be applied for the 250 W version and a 350 W output load shall be applied to the
350 W version.
2. Maximum input current at high input voltage range shall be measured at 180 VAC. A 125W output load shall be applied to
the 125W version, a 250 W output load shall be applied for the 250 W version and a 350 W output load shall be applied to the
350 W version.
3. This is not to be used for determining agency input current markings.
4. Maximum rated input current is measured at 100 VAC and 200 VAC.
1,3
4.2 A
2,3
MAX Input
Current
(250W)
2.1 A
rms
rms
1,3
2,3
MAX Input
Current
(350W)
5.9 A
3.0 A
MAX Rated Input
Current
(125W/250W/350W)
1,3
2.2 / 3.8 / 5.3A
rms
2,3
rms
1.1 / 1.9 / 2.7 A
rms
rms
4
4
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.
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