CP605
System Considerations
ID 25095, Rev. 07
© 2004 Kontron Modular Computers GmbH
Page 6 - 11
2509
5.07.UG.VC.041005/14244
8
6.2.3.4
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.
6.2.3.5
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 6-3: Start-Up Ramp of the CP3-SVE180 AC Power Supply
Note ...
Non-industrial ATX PSUs require a greater minimum load than a single CP605
is capable of creating. When a PSU of this type is used, it will not power up
correctly and the CP605 may hang up. The solution is to use an industrial PSU
or to add more load to the system.
Note ...
If the main power input is switched off, the 3.3V supply voltage 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.
Channel 1: 5 V
Channel 2: 3.3 V
