Intel ATX12VO User Manual

Electrical
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Computers have decreased Idle power greatly since 2005, to where PSU loss is a big
concern for overall AC power of a computer in Idle Mode. The lowest DC load for
computers at this Idle Mode is determined to be 10 Watts for mainstream computers
and could go lower. Computers with PSU larger than 500 Watts are also expected to
have more components and therefore the Idle Mode will be at a higher DC Load. A
PSU above 500 Watts will use the Low Load Efficiency set at the 2% level.
Low Load Efficiency is another significant advantage for Single Rail Desktop Power
Supplies. Therefore, the Low Load Efficiency requirements are aggressive to help
computers meet Energy Regulations that require a very low Idle Power.
Low Load Efficiency requirements are based on overall DC power output and the
efficiency levels defined in Table 4-16. These values are shown in the below table.
Table 4-17: Low Load Efficiency Requirements Depending on Overall PSU Size
DC
Output
Rating
(W)
10W Load 2% Load
Recomme
nded
Required
(≥80 Plus
Silver)
Required
(Only Min
Eff Req)
Recomme
nded
Required
(≥80 Plus
Silver)
Required
(Only Min
Eff Req)
<400 >75%
≥ 70% ≥ 68%
-
-
400–500 >72%
≥ 70% ≥ 68%
-
-
>500 -
- -
>72%
≥ 70% ≥ 68%
The 10 Watt testing load conditions are defined as:
Table 4-18: 10W Load Condition (Value in Amps for PSU ≤ 500 Watts)
Load
+12VSB +12V
10W 0.04 A 0.80 A
4.5.9 Power Supply Efficiency for Energy Regulations - ENERGY
STAR* and CEC PC Computers with High Expandability
Score (Recommended)
The efficiency of the power supply should be tested at nominal input voltage of 115
VAC input and 230 VAC input, under the load conditions defined in the form factor
specific sections, and under the temperature and operating conditions defined in 7
.
The loading condition for testing efficiency represents fully loaded systems, typical
(50%) loaded systems, and light (20%) loaded systems. For systems being sold into
the state of California that meet the High Expandability Computer definition (details at
the referenced CEC website below) are required to meet the efficiency target list in
Table 4-20: CEC PC Computers with High Expandability Computers.
Visit ENERGY STAR* Computers Ver.8 website for more details:
• https://www.energystar.gov/products/spec/computers_version_8_0_pd
Visit CEC* website for more details:

Intel ATX12VO Specifications

General

Brand	Intel
Model	ATX12VO
Category	Power Supply
Language	English