Power Considerations
CP307
Page 5 - 6
ID 34424, Rev. 3.0
P R E L I M I N A R Y
5.1.3.4
Regulation
The power supply shall be unconditionally stable under line, load, unload and transient load
conditions including capacitive loads. The operation of the power supply must be consistent
even without the minimum load on all output lines.
5.1.3.5
Rise Time Diagram
The following figure illustrates an example of the recommended start-up ramp of a CPCI power
supply for all Kontron boards delivered up to now.
Figure 5-1: Start-Up Ramp of the CP3-SVE180 AC Power Supply
Warning!
All of the input voltages must be functionally coupled to each other so that if
one input voltage fails, all other input voltages must be regulated proportion-
ately to the failed voltage. For example, if the +5V begins to decrease, all other
input voltages must decrease accordingly. This is required in order to preclude
cross currents within the CP307.
Failure to comply with above may result in damage to the board or improper
system operation.
Note ...
If the main power input is switched off, the supply voltages will not go to 0V
instantly. It will take a couple of seconds until capacitors are discharged. If the
voltage rises again before it went below a certain level, the circuits may enter a
latch-up state where even a hard RESET will not help any more. The system
must be switched off for at least 3 seconds before it may be switched on again.
If problems still occur, turn off the main power for 30 seconds before turning it
on again.
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