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CP3923 User Guide
69
6
Power Considerations
6.1
System Power
The considerations presented in the ensuing chapters must be taken into account by system integrators when specifying
the CP3923 system environment.
6.1.1
Baseboard
The CP3923 baseboard itself has been designed for optimal power input and distribution. Still it is necessary to observe cer-
tain criteria essential for application stability and reliability.
The board is supplied by the 3.3V and the 5.0V from the backplane. All supply voltages from the backplane are enabled with
a predefined ramp-up time. The inrush current is limited by Hot-Swap controllers.
The table below indicates the absolute maximum input voltage ratings that must not be exceeded. Power supplies to be
used with the CP3923 should be carefully tested to ensure compliance with these ratings.
6.1.2
Backplane
Backplanes to be used with the CP3923 must be adequately specified. The backplane must provide optimal power distribu-
tion for the +3.3 V and +5 V power inputs.
Input power connections to the backplane itself should be carefully specified to ensure a minimum 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.
Table 6-1:
Maximum Input Power Voltage Limits
Supply Voltage
Maximum permitted Voltage
+3.3 V
+3.6 V
+5 V
+5.5 V
WARNING
The maximum permitted voltage indicated in the table above must not
be exceeded. Failure to comply with the above may result in damage to
your board.
