SSI
EPS2U
Power Supply Design Guide
A Server System Infrastructure (SSI) Specification
For Entry Chassis Power Supplies
Revision 2.1
Revision History
Orig./Rev. | Description of Changes | Date | |
1.0 | Initial release of EPS2U specification |
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1.1 | Updated EPS2U spec with an added 12V 240VA channel, updated mounting | 4/14/02 | |
| features, and added gold comment for gold signal contacts |
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1.2 | Approved EPS2U specification including changes from 4/23/2002 SSI council meeting | 4/23/02 | |
2.0 | Added output power level recommendations for 550W, 600W, and 650W power | 9/27/02 | |
| supplies and updated connector |
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| Modified 12V continuous and peak requirements for 480W power level. |
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| Updated transient load requirements, 240VA requirements, and signal description for |
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| PWOK. |
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| Removed temperature rise requirements from thermal section and added efficiency |
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| and airflow recommendations for each power level. |
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2.1 | Section 4.2 - Changed operating temperature to 45°C from 50°C | 5/16/03 | |
Section 6.1 - Added 3.3V remote sense to pin 1 of baseboard connector | |||
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| Section 6.1 - Changed +12V4 wire color to Yellow/Green stripe |
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| Added Section 6.1.1 – 12V Power Rail Configurations |
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| Section 6.4 - Changed output load rating tables |
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| Defined one load range per output level (vs. two) |
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| Increased +12V currents for 550, 600 & 650W split plane supplies |
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| Section 6.6 - Adjusted transient load requirements |
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