Kontron VMP3 - Manual (Page 130)

System Considerations VMP3
Page 6 - 6 © 2005 Kontron Modular Computers GmbH ID 29230, Rev. 01
30504
.01.VC.050727/091441
P R E L I M I N A R Y
The following table specifies the range for the input power voltage within which the board is
functional. The VMP3 is not guaranteed to function if the board is not operated within the
prescribed limits.
6.3.3 Backplane Requirements
Backplanes to be used with the VMP3 must be adequately specified. The backplane must pro-
vide optimal power distribution for the +5 V power input. It is recommended to use only back-
planes which have two power planes for the +5 V and GND.
Input power connections to the carrier itself should be carefully specified to ensure a minimum
of power loss and to guarantee operational stability. Long input lines, under dimensioned ca-
bling or bridges, high resistance connections, etc. must be avoided.
6.3.4 Power Supply Units
Power supplies for the VMP3 must be specified with enough reserve for the remaining system
consumption. In order to guarantee a stable functionality of the system, it is recommended to
provide more power than the system requires. An industrial power supply unit should be able
to provide at least twice as much power as the entire system requires.
As the design of the VMP3 has been optimized for minimal power consumption, the power sup-
ply unit should be stable even under no load conditions.
Where possible, power supplies which support voltage sensing should be used. Depending on
the system configuration this may require an appropriate carrier. The power supply should be
sufficient to allow for die resistance variations.
Table 6-3: DC Operational Input Voltage Range
INPUT SUPPLY
VOLTAGE
ABSOLUTE
RANGE
RECOMMENDED
RANGE
REMARKS
+5 V 4.6 V min. to 5.5 V max. 4.75 V min. to 5.25 V max. Main voltage
Note ...
Some PSUs require a greater minimum load than a single VMP3 is capable of
creating. When a PSU of this type is used, it will not power up correctly and the
VMP3 may hangup. The solution is to use an industrial PSU or to add more
load to the system.
If DC/DC power supplies are used, please ensure that the external main sup-
ply provides sufficient power in order to start-up the system properly. The
external main supply should provide at least as much power as the system
power supply is able to provide taking into consideration the inrush current.
Warning!
An underdimensioned power supply may cause damage to system compo-
nents.