Introduction
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1 Introduction
This document aligns to ATX Specification Version 3.0
This document provides design suggestions for various power supply form factors. The
power supplies are primarily intended for use with desktop system designs. It should
not be inferred that all power supplies must conform exactly to the content of this
document, though there are key parameters that define mechanical fit across a
common set of platforms. Since power supply needs vary depending on system
configuration, the design specifics described are not intended to support all possible
systems. 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.
1.1 Alternative Low Power Mode for Power Supplies
Computers continue to change and introduce 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 new power states have created
requirements for power supplies. Below is a summary of these requirements as they
are mentioned throughout the document.
• Section 4.2.4
– Other Lower Power System Requirements:
Table 4-5 shows that ALPM requirements are at the 0.55 A and 1.5 A load
levels.
• Section 4.3 - Timing, Housekeeping and Control:
Table 4-9 has a column for require values of T1 and T3 to support ALPM.
• Section 4.2.2–Reliability – PS_ON# Toggle for S0ix Mode and Section 10.2:
The number of times a PSU toggles on and off is expected to increase.
• Section 4.3.3: PS_ON# – REQUIRED
PSU response quickly to toggling of PS_ON# signal.
1.2 Reference Documentation
The following documents are referenced in various sections of this design guide. The
document may not be up to date; refer to the latest version. For guidelines not
specifically mentioned here, refer to the appropriate document.
Document
Document Number
/Source
European Association of Consumer Electronics Manufacturers
(EACEM*)
Hazardous Substance List / Certification
AB13-94-146
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