Introduction
8 Design Guide
1 Introduction
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 where the
recommended sections could be modified based on system design.
1.1 Alternative Low Power Mode for Power Supplies
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* Modern Standby or Google*
Chrome* Lucid Sleep. These new power states have created new requirements for
power supplies. Below is a summary of these requirements as they are mentioned
throughout the document.
• Section 3.2.4
– Other Lower Power System Requirements
Table 3-4 shows that ALPM requirements are at the 0.55A and 1.5A load levels.
• Section 3.3 – Timing, housekeeping and Control
Table 3-8 has a column for require values of T1 and T3 to support ALPM.
• Section 9.2 – Reliability – PS_ON# Toggle for S0ix Mode
The number of times a PSU toggles on and off is expected to increase.
1.2 References
The following documents are referenced in various sections of this design guide. The
document may not up-to-date; refer to the latest version. For guidelines not
specifically mentioned here, refer to the appropriate document.
Document Title
Document
Number /Source
European Association of Consumer Electronics Manufacturers (EACEM*)
Hazardous Substance List / Certification
AB13-94-146
IEEE* Recommended Practice on Surge Voltages in Low-Voltage AC Circuits ANSI* C62.41-1991
IEEE Guide on Surge Testing for Equipment Connected to Low-Voltage AC
Power Circuits
ANSI C62.45-1992
Nordic national requirement in addition to EN 60950
EMKO-TSE (74-
SEC) 207/94
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