Introduction
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Table 1-1: Conventions and Terminology
Acronym/Convention/
Terminology
Description
ALPM
Alternative Low Power Mode (ALPM) replaces the traditional Sleep
Mode (ACPI S3) and sometime Long Idle [Idle (S0) Display off]
with a new lower power mode. An example of ALPM is Microsoft*
Modern Standby* or Lucid Sleep with Google* Chrome*
AWG American Wire Gauge
BA
Declared sound power, LwAd. The declared sound power level
shall be measured according to ISO* 7779 for the power supply
and reported according to ISO 9296.
CFM Cubic Feet per Minute (airflow).
Monotonically
A waveform changes from one level to another in a steady
fashion, without oscillation.
MTBF Mean time between failure.
Noise
The periodic or random signals over frequency band of 0 Hz to 20
MHz.
Non-ALPM
Computers that do not use Alternative Low Power Mode use
traditional Sleep Mode (ACPI S3).
Overcurrent
A condition in which a supply attempts to provide more output
current than the amount for which it is rated. This commonly
occurs if there is a "short circuit" condition in the load attached to
the supply.
PFC Power Factor Correction.
p-p Peak to Peak Voltage Measurement.
PWR_OK
PWR_OK is a “power good” signal used by the system power
supply to indicate that the +12VDC outputs are above the under-
voltage thresholds of the power supply.
Ripple noise
The periodic or random signals over a frequency band of 0 Hz to
20 MHz.
Rise Time
Rise time is defined as the time it takes any output voltage to rise
from 10% to 90% of its nominal voltage.
SELV
Safety Extra Low Voltage - UL 60950-1 states that a SELV circuit
is a “secondary circuit, which is so designed and protected that
under normal and single fault conditions, its voltages do not
exceed a safe value.” A “secondary circuit” has no direct
connection to the primary power (AC mains) and derives its
power via a transformer, converter, or equivalent isolation device
Surge
The condition where the AC line voltage rises above nominal
voltage.
VSB or Standby Voltage
An output voltage that is present whenever AC power is applied
to the AC inputs of the supply.
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