Kontron VMP3 - Manual (Page 129)

VMP3 System Considerations
ID 29230, Rev. 01 © 2005 Kontron Modular Computers GmbH Page 6 - 5
30504
.01.VC.050727/091441
P R E L I M I N A R Y
From the above it can be readily seen that the VMP3 supports both open and closed system
environments. The key point of issue regardless of the type of environment, however, is the re-
quirement of the VMP3 for additional cooling. In particular, if convectional cooling is planned it
is imperative that a minimum air flow be ensured. The minimum air flow requirement is depen-
dent on the configuration employed and the temperature of the ambient air.
6.2 Heat Sinks
The VMP3 and its available versions are fitted with optimally designed heat sinks. The physical
size, shape, and construction ensures the best possible thermal resistance (R
th
) coefficients.
In addition, it is specifically designed to efficiently support forced air flow concepts as found also
in modern VNE system chassis.
Even though the VMP3 is fitted with an optimally designed heat sink, the thermal energy dissi-
pated by the high performance CPU exceeds the thermal capabilities of the heat sink for some
applications. In these cases, the VMP3 must operated with forced airflow cooling. For further
assistance regarding cooling requirements, please contact Kontron’s technical support.
6.3 Power Considerations
6.3.1 System Power
Increasing the performance of a CPU in addition to higher integration results in higher power
consumption. This results in special requirements for the power supply of a VME system. The
considerations presented in the ensuing sections must be taken into account by system inte-
grators when specifying the VMP3 system environment.
6.3.2 VMP3 Voltage Ranges
The VMP3 board itself has been designed for optimal power input and distribution. Still it is nec-
essary to observe certain criteria essential for application stability and reliability.
The table below indicates the absolute maximum input voltage rating that must not be exceed-
ed. Power supplies to be used with the VMP3 should be carefully tested to ensure compliance
with these ratings. The +12V and -12V inputs are not used by the VMP3.
Table 6-2: Absolute Maximum Rating
SUPPLY VOLTAGE ABSOLUTE MAXIMUM RATINGS
+5 V +7 V
Warning!
The maximum permitted voltage indicated in the table above must not be
exceeded. This may also be reduced if an expansion board requires a lower
voltage. Failure to comply with the above may result in damage to your board.