Backplane - Kontron CP6500-V User Manual

Power Consumption
6.1.2

Backplane

Backplanes to be used with the CP6500-V must be adequately specified. The backplane must
provide optimal power distribution for the +3.3 V, +5 V and +12 V power inputs. If a PMC mod-
ule is used on the CP6500-V, an additional power input of -12 V is required.
Input power connections to the backplane itself should be carefully specified to ensure a mini-
mum of power loss and to guarantee operational stability. Long input lines, under dimensioned
cabling or bridges, high resistance connections, etc. must be avoided. It is recommended to
use POSITRONIC or M-type connector backplanes and power supplies where possible.
6.1.3 Power Supply Units
Power supplies for the CP6500-V must be specified with enough reserve for the remaining sys-
tem 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. An ATX power supply
unit should be able to provide at least three times as much power as the entire system requires.
As the design of the CP6500-V has been optimized for minimal power consumption, the power
supply unit shall be stable even without minimum load.
Where possible, power supplies which support voltage sensing should be used. Depending on
the system configuration this may require an appropriate backplane. The power supply should
be sufficient to allow for die resistance variations.
Note ...
Non-industrial ATX PSUs require a greater minimum load than a single
CP6500-V is capable of creating. When a PSU of this type is used, it will not
power up correctly and the CP6500-V 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.
The start-up behavior of CPCI and PCI (ATX) power supplies is critical for all new CPU boards.
These boards require a defined power of sequence and start-up behavior of the power supply.
The required behavior is described in the ATX
tail.asp?FFID=1&CatID=2) and the CPCI (PICMG, http://www.picmgeu.org/) specification.
Page 6 - 4 © 2005 Kontron Modular Computers GmbH
CP6500-V
(http://www.formfactors.org/FFDe-
ID 28945, Rev. 01