Introduction
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1 Introduction
This document aligns to ATX12VO Specification Version 2.0
This document provides design requirements for an industry standard focused on
single rail power supplies that will meet the existing mechanical size for power
supplies while providing the opportunity for higher platform power efficiency. Multi-rail
power supply designs have existed for many decades but as computers are evolving a
new single main power rail input power is needed to increase efficiency of the power
supply.
These single rail power supplies are primarily intended for use with desktop system
designs. The key parameters that define mechanical fit across a common set of
platforms does not change with existing power supply designs.
This Single Rail Power Supply Design Guide is intended to work for a majority of
desktop computer designs. The multi-rail Intel Desktop Power Supply Design Guide
(Doc#336521
), includes criteria for many different varieties of desktop computers.
This document only details what needs to be included in the Single Rail Power Supply
Industry standard. The REQUIRED sections are intended to be followed for all
systems. The RECOMMENDED sections could be modified based on system design.
Lastly, a few sections are labeled as OPTIONAL, which would not be intended for all
design but is helpful to some designs.
The sp
ecification name for this Power Supply Design is ATX12VO, which stands for
ATX 12V Only. If the mechanical size of the power supply is different from ATX, for
example SFX then it would be SFX12VO.
This document covers the design parameters for the Power Supply to meet the
ATX12VO Specification.
1.1 Power Supplies and Alternative Low Power Mode
Computers are continuing to change and introducing new power states. One of these
new power states is generically called an Alternative Low Power Mode (ALPM). Some
examples of Alternative Low Power Modes are Microsoft* Windows 10 Modern Standby
or Google* Chrome* Lucid Sleep. These low power states have created requirements
for power supplies. Below is a summary of these requirements as they are mentioned
throughout the document. All ALPM features are required in this Single Rail Desktop
Power Supply Design Guide.
• Section 4.2.4
: Other Lower Power System Requirements
To help meet multiple world-wide Energy Regulations the +5VSB standby rail
must meet the following efficiency as shown in Table 4-5 which is measured
with the main outputs off (PS_ON# high state). These World-Wide Energy
Regulations and standards include: Blue Angel* system requirements, RAL-
UZ 78, US Presidential executive order 13221, ENERGY STAR*, ErP Lot 6
requirements (2010 and 2013 levels), and 2014 ErP Lot 3 requirements.
Additionally, if any Computers use an Alternative Low Power Mode (ALPM)
then the +5VSB standby efficiency has similar requirements as shown below.
Table 4-5 shows that ALPM requirements are at the 230 mA and 625 mA load
levels.
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