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Power Supply Design Guide
A Server System Infrastructure (SSI) Specification
For Entry Chassis Power Supplies
Orig./Rev.
1.0
Initial release of EPS2U specification
1.1
Updated EPS2U spec with an added 12V 240VA channel, updated mounting
features, and added gold comment for gold signal contacts
1.2
Approved EPS2U specification including changes from 4/23/2002 SSI council meeting
2.0
Added output power level recommendations for 550W, 600W, and 650W power
supplies and updated connector pin-outs.
Modified 12V continuous and peak requirements for 480W power level.
Updated transient load requirements, 240VA requirements, and signal description for
PWOK.
Removed temperature rise requirements from thermal section and added efficiency
and airflow recommendations for each power level.
Section 4.2 - Changed operating temperature to 45°C from 50°C
2.1
Section 6.1 - Added 3.3V remote sense to pin 1 of baseboard connector
Section 6.1 - Changed +12V4 wire color to Yellow/Green stripe
Added Section 6.1.1 – 12V Power Rail Configurations
Section 6.4 - Changed output load rating tables
Section 6.6 - Adjusted transient load requirements
EPS2U
Revision 2.1
Revision History
Description of Changes
Defined one load range per output level (vs. two)
Increased +12V currents for 550, 600 & 650W split plane supplies
SSI
Date
4/14/02
4/23/02
9/27/02
5/16/03
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Table of Contents
Related Manuals for SSI America EPS2U
Summary of Contents for SSI America EPS2U
- Page 1 For Entry Chassis Power Supplies Orig./Rev. Initial release of EPS2U specification Updated EPS2U spec with an added 12V 240VA channel, updated mounting features, and added gold comment for gold signal contacts Approved EPS2U specification including changes from 4/23/2002 SSI council meeting Added output power level recommendations for 550W, 600W, and 650W power supplies and updated connector pin-outs.
- Page 2 EPS2U Power Supply Design Guide, V2.1 Disclaimer: THIS SPECIFICATION PROVIDED "AS IS" WITH WARRANTIES WHATSOEVER, INCLUDING WARRANTY 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...
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Page 3: Table Of Contents
Control and Indicator Functions ... 26 PSON# ... 26 PWOK (Power OK) ... 27 Field Replacement Unit (FRU) Signals ... 27 8.3.1 FRU Data ... 27 8.3.2 FRU Data Format... 28 EPS2U Power Supply Design Guide, V2.1 - 3 -... - Page 4 Table 29: PWOK Signal Characteristics... 27 Table 30: FRU Device Information ... 28 Table 31: FRU Device Product Information Area ... 28 Table 32: FRU Device Product Information Area ... 29 EPS2U Power Supply Design Guide, V2.1 - 4 -...
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Page 5: Purpose
Local DC-DC converters shall be utilized for processor power, and will ideally convert power from the +12 V rail, however, they may also convert power from other rails. The bulk power system may be a n+1 redundant power system or a non-redundant power system. EPS2U Power Supply Design Guide, V2.1 - 5 -... -
Page 6: Definitions/Terms/Acronyms
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. - 6 - EPS2U Power Supply Design Guide, V2.1... -
Page 7: Mechanical Overview
The EPS2U is a power supply enclosure intended to handle a power range of 400W to 700W. A mechanical drawing of the power supply cage is shown below in Figure 1. -
Page 8: Airflow Requirements
“Handle, knobs, grips, etc. held for short periods of time only”. temperature range. The average air Table 1: Thermal Requirements - 8 - EPS2U Power Supply Design Guide, V2.1 O of UNITS °C °C... -
Page 9: Ac Input Requirements
The following efficiency requirements are provided as a recommendation to allow for proper power supply cooling when installed in a system. Power Level 480W 550W 600W 650W EPS2U Power Supply Design Guide, V2.1 Table 2: AC Input Rating RATED 90 V 100-127 V 140 V 180 V... -
Page 10: Ac Line Dropout
The power supply shall meet the requirements under the following AC line sag and surge conditions. ). The peak inrush current shall be less than the ratings of its critical components - 10 - EPS2U Power Supply Design Guide, V2.1... -
Page 11: Ac Line Fast Transient Specification
50/60 Hz AC Line Surge Line Frequency 50/60 Hz 50/60 Hz - 11 - EPS2U Power Supply Design Guide, V2.1 Performance Criteria No loss of function or performance No loss of function or performance Loss of function acceptable, self recoverable... -
Page 12: Dc Output Specification
Baseboard components other than processors +12V3 Drives and peripherals Table 6: 12V Rail Summary Split Plane System +12V1 Processor 1 +12V2 Processor 2 +12V3 Baseboard components other than processors +12V4 Drives and peripherals - 12 - EPS2U Power Supply Design Guide, V2.1... -
Page 13: Baseboard Power Connector
Black Gray Reserved (-5 V in ATX) Purple +5 VDC Yellow/Blue Stripe +5 VDC Yellow/Blue Stripe +5 VDC Orange - 13 - EPS2U Power Supply Design Guide, V2.1 18 AWG Color Orange Blue Black Green Black Black Black N.C. Black... -
Page 14: Processor Power Connector
Black +12 V1 Black +12 V1 Black +12 V2 Black +12 V2 - 14 - EPS2U Power Supply Design Guide, V2.1 18 AWG Color Yellow/Black Stripe Yellow/Black Stripe Yellow/Black Stripe Yellow/Black Stripe 18 AWG Color Yellow/Black Stripe Yellow/Black Stripe Yellow... -
Page 15: Peripheral Power Connectors
Yellow (Yellow/Blue Stripe or Yellow/Green stripe) Black Black Table 12: P9 Floppy Power Connector 22 AWG Color Black Black 1, 2 Yellow (Yellow/Blue Stripe or Yellow/Green stripe) - 15 - EPS2U Power Supply Design Guide, V2.1 1, 2 1, 2... -
Page 16: Grounding
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. Table 13: Server Signal Connector Signal 24 AWG Color White/Green Stripe White/Yellow Stripe Black/White Stripe Orange/White Stripe - 16 - EPS2U Power Supply Design Guide, V2.1... -
Page 17: Output Power/Currents
Table 15: 550 W Load Ratings – Split Plane Minimum Continuous 0.8 A 0.5 A 0.9 A 0.1 A 0.1 A - 17 - EPS2U Power Supply Design Guide, V2.1 Maximum Continuous Peak 24 A 20 A 18 A 22 A 18 A 0.5 A... -
Page 18: Standby Outputs
Table 17: 650 W Load Ratings – Split Plane Minimum Continuous 0.8 A 0.5 A 0.9 A 0.1 A 0.1 A - 18 - EPS2U Power Supply Design Guide, V2.1 Maximum Continuous Peak 24 A 20 A 12 A 15 A 12 A... -
Page 19: Voltage Regulation
+5.25 +12.00 +12.60 +12.00 +12.60 +12.00 +12.60 -12.20 -13.08 +5.00 +5.25 Table 19: Optional +5V Regulation Limits +5.00 +5.25 - 19 - EPS2U Power Supply Design Guide, V2.1 Units Tolerance +5/-3% +5/-4% +5/-4% +5/-4% +5/-4% +9/-5% +5/-3% Units Tolerance +5/-3%... -
Page 20: Dynamic Loading
65% of max load 0.5 A/µs 25% of max load 0.5 A/µs Table 21: Capacitve Loading Conditions 12,000 12,000 11,000 - 20 - EPS2U Power Supply Design Guide, V2.1 Capacitive Load 1000 µF 1000 µF 2200 µF 1 µF Units µF µF µF... -
Page 21: Ripple / Noise
+12 V -12 V 50 mVp-p 120 mVp-p 120 mVp-p Table 23: Output Voltage Timing - 21 - EPS2U Power Supply Design Guide, V2.1 +5 VSB 50 mVp-p ) of each other during turn vout_on ) of each other vout_off... -
Page 22: Figure 2: Output Voltage Timing
AC turn on. vout_rise vout_on Figure 2: Output Voltage Timing Table 24: Turn On/Off Timing active to output voltages within deactive to PWOK being - 22 - EPS2U Power Supply Design Guide, V2.1 vout_off UNITS 1500 2500 1000 1000... -
Page 23: Figure 3: Turn On/Off Timing (Single Power Supply)
PSON# AC turn on/off cycle Figure 3: Turn On/Off Timing (Single Power Supply) vout_holdup pwok_off pwok_on pwok_holdup Tsb_holdup - 23 - EPS2U Power Supply Design Guide, V2.1 pwok_low pwok_on sb on delay pson_on_delay PSON turn on/off cycle UNITS pwok_off pson_pwok... -
Page 24: Protection Circuits
AC power interruption. The power supply shall not be Table 25: Over Current Protection Voltage Over Current Limit (Iout limit) 110% minimum; 150% maximum 110% minimum; 150% maximum 110% minimum; 150% maximum - 24 - EPS2U Power Supply Design Guide, V2.1 cycle HIGH... -
Page 25: Over Voltage Protection
Common Plane Table 27: Over Voltage Limits MIN (V) 13.3 -13.3 - 25 - EPS2U Power Supply Design Guide, V2.1 Split Plane Over Current Limit (Iout limit) 110% minimum; 150% maximum 110% minimum; 150% maximum 15A minimum; 20A maximum Peak current minimum; 20A maximum Peak current minimum;... -
Page 26: Control And Indicator Functions
≤ 1.0 V PS is enabled 1.0V 2.0V Figure 4: PSON# Signal Characteristics - 26 - EPS2U Power Supply Design Guide, V2.1 is an active low signal that turns 1.0 V 5.25 V 4 mA 400 ms 50 ms ≥ 2.0 V... -
Page 27: Pwok (Power Ok)
Table 29: PWOK Signal Characteristics +5V TTL Compatible output signal Power OK Power Not OK 2.4 V 200 ms 1 ms pwok_off - 27 - EPS2U Power Supply Design Guide, V2.1 0.4 V 5.25 V 1000 ms 100 µs 200 ms... -
Page 28: Fru Data Format
Customer part number Customer current revision {Defined at time of manufacture} {Not used, code is zero length byte} {Not required} {Added as necessary to allow for 8-byte offset to next area} - 28 - EPS2U Power Supply Design Guide, V2.1... -
Page 29: Table 32: Fru Device Product Information Area
Five outputs are to be defined from #1 to #5, as follows: +3.3 V, +5 V, +12 V, -12V, and +5 VSB. Set for: Standby on +5 VSB, No Standby on all others. Format per IPMI specification, using parameters in the EPS12V specification. - 29 - EPS2U Power Supply Design Guide, V2.1... -
Page 30: Mtbf
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. EPS2U Power Supply Design Guide, V2.1 - 30 -...
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