CP6000
Power Consumption
ID 27942, Rev. 05
© 2005 Kontron Modular Computers GmbH
Page 6 - 5
2794
2.05.UG.VC.051020/17275
8
6.1.3.2
Power-Up Sequence
The +5 VDC output level must always be equal to or higher than the +3.3 VDC output during
power-up and normal operation.
The time from +5 VDC until the output reaches its minimum in regulation level and from
+3.3 VDC until the output reaches its minimum in regulation level must be < 20 ms.
6.1.3.3
Tolerance
The tolerance of the voltage lines is described in the CPCI specification (PICMG 2.0 R3.0).The
recommended measurement point for the voltage is the CPCI connector on the CPU board.
The following table provides information regarding the required characteristics for each board
input voltage.
The output voltage overshoot generated during the application (load changes) or during the
removal of the input voltage must be less than 5% of the nominal value. No voltage of reverse
polarity may be present on any output during turn-on or turn-off.
6.1.3.4
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.
Table 6-3: Input Voltage Characteristics
VOLTAGE
NOMINAL VALUE
TOLERANCE
MAX. RIPPLE (p-p)
REMARKS
5 V
+5.0 VDC
+5%/-3%
50 mV
Main voltage
3.3 V
+3.3 VDC
+5%/-3%
50 mV
--
+12 V
+12 VDC
+5%/-5%
240 mV
Required
-12 V
-12 VDC
+5%/-5%
240 mV
Not required
V I/O (PCI) voltage
+3.3 VDC or +5 VDC
+5%/-3%
50 mV
Standard Version
+5.0 V
GND
Ground, not directly connected to potential earth (PE)
Note ...
Non-industrial ATX PSUs require a greater minimum load than a single
CP6000 is capable of creating. When a PSU of this type is used, it will not
power up correctly and the CP6000 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.
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