SSI America EPS1U Guida

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

1Purpose..........................................................................................................................................................5

2Conceptual Overview....................................................................................................................................5

3Definitions/Terms/Acronyms .......................................................................................................................6

4Mechanical 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

5AC 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

6DC 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

7Protection Circuits......................................................................................................................................23

7.1 Current Limit......................................................................................................................................23

7.2 240VA Protection ..............................................................................................................................23

7.3 Over Voltage Protection....................................................................................................................24

7.4 Over Temperature Protection............................................................................................................24

8Control 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

SSI

EPS1U Power Supply Design Guide, V1.1

9MTBF.............................................................................................................................................................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

1Purpose

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.

2Conceptual 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.

SSI

EPS1U Power Supply Design Guide, V1.1

3Definitions/Terms/Acronyms

Table 1: Definitions, Terms, and Acronyms (listed alphabetically)

Required The status given to items within this design guide, which are required to

meet SSI guidelines and a large majority of system applications.

Recommended The status given to items within this design guide which are not required to

meet SSI guidelines, however, are required by many system applications.

Optional 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.

Full Ranging 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.

CFM Cubic Feet per Minute (airflow).

Dropout A condition that allows the line voltage input to the power supply to drop to

below the minimum operating voltage.

Latch Off 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.

Monotonically A waveform changes from one level to another in a steady fashion, without

intermediate retracement or oscillation.

MTBF Mean time between failure

Noise The periodic or random signals over frequency band of 0 Hz to 20 MHz.

Overcurrent 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.

PFC Power Factor Corrected.

PWOK 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.

Ripple The periodic or random signals over a frequency band of 0 Hz to 20 MHz.

Rise Time Rise time is defined as the time it takes any output voltage to rise from

10% to 95% of its nominal voltage.

Sag The condition where the AC line voltage drops below the nominal voltage

conditions.

Surge The condition where the AC line voltage rises above nominal voltage.

VSB or Standby Voltage An output voltage that is present whenever AC power is applied to the AC

inputs of the supply.

SSI

EPS1U Power Supply Design Guide, V1.1

4Mechanical 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 1for

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.

Figure 1: Enclosure Drawing

300.0

0.2

8.5

0.3

Interior Face View

40.0

+0.2/

0.5

Exterior Face View

106.0

0.2

80.92

+0/

0.05

12.54

0.3

5.0

0.3

Fan

IEC Connector

Fan

AC I/P

Bi-Color LED

(PWR/Fail)

IEC Connector

Center Line

53.0

0.2

16.4

0.2

IEC Connector

Center Line

All dimensions are i

n millimeters.

Top View

Side View 1

62 32

SSI

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 2details 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.

Figure 2: Alternate Enclosure Drawing

215.0

0.2

Interior Face

40.0

+0.2/

0.5

Exterior Face

face

106.0

0.2

Fan

IEC Connector

Fan

AC I/P

Bi-Color LED

(PWR/Fail)

IEC Connector

Center Line

53.0

0.2

16.4

0.2

IEC Connector

Center Line

All dimensions are in millimeters.

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. 045 °C

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.

°C

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.

°C

∆Tps

350 W output power, 10 CFM, Sea level, 25 °C inlet air.

350 W output power, 6 CFM, Sea level, 25 °C inlet air. 30

40 °C

°C

Tnon-op Non-operating temperature range. -40 70 °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”.

SSI

EPS1U Power Supply Design Guide, V1.1

5AC 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)

MAX Input

Current

(250W)

MAX Input

Current

(350W)

MAX Rated Input

Current

(125W/250W/350W)

Voltage (110) 90 Vrms 100-127 Vrms 140 Vrms 2.4 Arms1,3 4.2 Arms1,3 5.9 Arms1,3 2.2 / 3.8 / 5.3Arms 4

Voltage (220) 180 Vrms 200-240 Vrms 264 Vrms 1.2 Arms2,3 2.1 Arms2,3 3.0 Arms2,3 1.1 / 1.9 / 2.7 Arms 4

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.

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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