Terminology
The below table defines the acronyms, conventions, and terminology that is used throughout the design guide.
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. |
Table 1-2: Support Terminology
Category | Description |
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. |