ATX Version 3.0 Multi Rail Desktop Platform Power Supply

Design Guide

ID 336521
Date 01/02/2022

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Power-Up Cross Loading Condition – REQUIRED

In the time frame between PS_​ON# assertion and PWR_​OK assertion (T1+T3), the power supply may be subjected to a cross load condition on the 12 V, 3.3 V and 5 V rails. The power supply must be able to successfully power up and assert PWR_​OK when 12 V (or combination of 12V1 and 12V2) is loaded to ≤ 0.1 A and 3.3 V and/or 5 V are loaded to 0-5 A.