Cooling Requirements - Motorola RAM104 User Manual

Processor/memory mezzanine module, dram memory module
Table of Contents

Advertisement

Cooling Requirements

Cooling Requirements
B
The Motorola RAM104 DRAM Memory module is specified, designed,
and tested to operate reliably when mounted on a PM603 or PM604
Processor/Memory mezzanine module (which is itself mounted on an
MVME160x board) with an incoming air temperature range from 0° to 55°
C (32° to 131° F) with forced air cooling at a velocity typically achievable
by using a 100 CFM axial fan.
Temperature qualification is performed in a standard Motorola
VMEsystem chassis. Twenty-five watt load boards are inserted in two card
slots, one on each side, adjacent to the board under test, to simulate a high
power density system configuration. An assembly of three axial fans, rated
at 100 CFM per fan, is placed directly under the VME card cage. The
incoming air temperature is measured between the fan assembly and the
card cage, where the incoming airstream first encounters the module under
test. Test software is executed as the module is subjected to ambient
temperature variations. Case temperatures of critical, high power density
integrated circuits are monitored to ensure component vendors
specifications are not exceeded.
While the exact amount of airflow required for cooling depends on the
ambient air temperature and the type, number, and location of boards and
other heat sources, adequate cooling can usually be achieved with 10 CFM
and 490 LFM flowing over the module. Less airflow is required to cool the
module in environments having lower maximum ambients. Under more
favorable thermal conditions, it may be possible to operate the module
reliably at higher than 55° C with increased airflow.
It is important to note that there are several factors, in addition to the rated
CFM of the air mover, which determine the actual volume and speed of air
flowing over a module.
B-3
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

Advertisement

Table of Contents
loading

Table of Contents