ATX Version 3.0 Multi Rail Desktop Platform Power Supply

Design Guide

ID 336521
Date 01/02/2022
Version 2.0
Public
Document Table of Contents

Terminology

Table 1-1 defines the acronyms, conventions, and terminology that is used throughout the design guide.

Table 1-1: Conventions and Terminology

Acronym, Convention/ Terminology

Description

ALPM

Alternative Low Power Mode, ALPM replaces the traditional Sleep Mode (ACPI S3) with a new sleep mode. An example of ALPM is with Microsoft* Windows Modern Standby* or Lucid Sleep with Google* Chrome*.

AWG

American Wire Gauge

BA

Declared sound power, LwAd. The declared sound power level shall be measured according to ISO* 7779 for the power supply and reported according to ISO 9296.

CFM

Cubic Feet per Minute (airflow).

Monotonically

A waveform changes from one level to another in a steady fashion, without oscillation.

MTBF

Mean time between failure.

Noise

The periodic or random signals over frequency band of 0 Hz to 20 MHz.

Non-ALPM

Computers that do not use Alternative Low Power Mode use traditional Sleep Mode (ACPI S3).

Overcurrent

A condition in which the current demand on a supply output exceeds its rated output current. This commonly occurs if there is a "short circuit" condition in the load attached to the supply.

PFC

Power Factor Correction.

p-p

Peak-to-Peak Voltage Measurement.

PWR_​OK

PWR_​OK is a “power good” signal used by the system power supply to indicate that the +5VDC, +3.3 VDC and +12VDC outputs are above the under-voltage thresholds of the power supply.

Ripple noise

The periodic or random signals over a frequency band of 0 Hz to 20 MHz.

Rise Time

Rise time is defined as the time it takes any output voltage to rise from 10% to 90% of its nominal voltage.

Surge

The condition where the AC line voltage rises above nominal voltage.

VSB or Standby Voltage

An output voltage that is present whenever AC power is applied to the AC inputs of the supply.

Table 1-2: Support Terminology

Category

Description

Optional

The status given to items within this design guide, which are not required to meet design guide, however, some system applications may optionally use these features. May be a required or recommended item in a future design guide.

Recommended

The status given to items within this design guide, which are not required to meet design guide, however, are required by many system applications. May be a required item in a future design guide.

Required

The status given to items within this design guide, which are required to meet design guide and a large majority of system applications.