Introduction
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• Section 4.3:
Table 4-9 “Required” timing values of T1 and T3 support ALPM. Multi rail
power supply design guide has the Required T1 and T3 timing values as
recommended for ALPM.
• Section 4.2.2– PS_ON#
• Section 10.2:
The number of times a PSU toggles on and off is expected to increase.
• Section 4.3.2:
PSU response quickly to toggling of PS_ON# signal
1.2 System Power Telemetry Feature
When ATX12VO was designed one pin was reserved in the main 10 pin connector for a
Telemetry feature. This Telemetry feature is the ability of the power supply to report
the percentage of rated power being used by the system. The system components can
then react when the power supply rated power limit is reached or exceeded. This is
reported as a percentage because power supplies come in many different power
ratings and there is no way for the power supply to tell the system its rated power
limit. The percentage method allows for a consistent method of telemetry between all
ATX12VO power supplies and the system.
The electrical details are explained further in Section 4.3.7
.
1.3 References
The following documents are referenced in various sections of this design guide. For
guidelines not specifically mentioned here, refer to the appropriate document.
Document Description
Document
Number/Source
IEEE Guide on the Surge Environment in Low-Voltage (1000 V and
Less) AC Power Circuits
ANSI C62.41.1-2002
IEEE Guide on Surge Testing for Equipment Connected to Low-
Voltage AC Power Circuits
ANSI C62.45-2002
European Association of Consumer Electronics Manufacturers
(EACEM*)
Hazardous Substance List / Certification
AB13-94-146
American National Standard for Methods of Measurement of Radio-
Noise Emissions from Low-Voltage Electrical and Electronic Equipment
in the Range of 9 kHz to 40 GHz for EMI testing
ANSI C63.4-2014
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