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.

Optional

The status given to items within this design guide, which are not required to meet design guide, however, some system applications may optionally use these features. May be a required or recommended item in a future design guide.

Recommended

The status given to items within this design guide, which are not required to meet design guide, however, are required by many system applications. May be a required item in a future design guide.

Required

The status given to items within this design guide, which are required to meet design guide and a large majority of system applications.