4 power supply units, 4 power supply units - 4, Power considerations cp932 – Kontron CP932 User Manual

Page 48

Power Considerations

CP932

Page 5 - 4

ID 30048, Rev. 01

3004

8.01.UG.VC.050622/19130

P R E L I M I N A R Y

5.4

Power Supply Units

Power supplies for the CP932 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. 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 CP932 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.

The start-up behavior of CompactPCI and PCI (ATX) power supplies is critical for all new Com-
pactPCI boards. These boards require a defined power sequence and start-up behavior of the
power supply. The required behavior is described in the ATX (http://www.formfactors.org/FF-
Detail.asp?FFID=1&CatID=2) and the CompactPCI (PICMG, http://www.picmgeu.org/) speci-
fication.

Note ...
Non-industrial ATX PSUs require a greater minimum load than a single CP932
is capable of creating. When a PSU of this type is used, it will not power up
correctly and the CP932 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.