EPS12V Power Supply Design Guide - TechPowerUp

SSI

EPS12V Power Supply Design Guide

A Server System Infrastructure (SSI) Specification For Entry Chassis Power Supplies

Version 2.92

SSI

EPS12V Power Supply Design Guide, V2.92

Orig./Rev.

2.1 2.8

2.9 2.91 2.92

Posted design guide

Description of Changes

Remove references to common and split 12V planes. Added higher power levels up to 800W. Reduced holdup time requirements to 75% of max load. Added cross loading plots. Added option for tighter 12V regulation. Add new SSI efficiency requirements (recommended level & loading conditions). Increase 12V rail currents. Tpwok_on max time reduced to 500msec. Change 5VSB to 3.0A for higher power levels. Added reference to PSMI spec. Modified SMBus section (FRU and PSMI) to 3.3V with 5V tolerance. Modified 240VA section; removed common plane, change to ................
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