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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
1.1 Updated EPS2U spec with an added 12V 240VA channel, updated mounting
features, and added gold comment for gold signal contacts
4/14/02
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
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.
9/27/02
2.1
Section 4.2 - Changed operating temperature to 45°C from 50°C
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
Defined one load range per output level (vs. two)
Increased +12V currents for 550, 600 & 650W split plane supplies
Section 6.6 - Adjusted transient load requirements
5/16/03