ATX電源的3.3V,5V,12V上電時序問題求救!

各位仁兄,現(xiàn)在對ATX的上電時序跟同事之間有異議,還請各位指點迷津.我查了ATX Guide,是這么說的:The +12 VDC and +5 VDC output levels must be equal to or greater than the +3.3 VDC output at all times during power-up and normal operation. The time between the +12 VDC or +5 VDC output reaching its minimum in-regulation level and +3.3 VDC reaching its minimum in-regulation level must be ≤ 20 ms.
按字面意思理解,就是說5V,12V先上電或同時上電.可同事給的要求卻是3.3V先上電.到底哪個對呢?還是我的理解有偏差.
還有,核心電壓和I/O口電壓哪個先上電?為什么呢?
貴求各位!謝謝!

全部回復(1)

只看樓主

正序查看

倒序查看

gwwater

LV.6

2005-05-09 10:13

12V或者5V的輸出電平在任何時候都必須大于等于3.3V的電平,包括啟動過程中和正常工作狀態(tài).從12V,5V到達最小規(guī)定電壓和3.3V到達最小規(guī)定電壓的時間間隔必須小于20mS.
(原文翻譯)

回復