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Power Considerations
5.1.3
Power Supply Units
Power supplies for the CP6003-RA/RC must be specified with enough reserve for the remain-
ing system consumption. In order to guarantee a stable functionality of the system, it is recom-
mended 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.
As the design of the CP6003-RA/RC 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 backplane input line resistance variations due to temperature changes, etc.
5.1.3.1
Start-Up Requirement
Power supplies must comply with the following guidelines, in order to be used with the CP6003-
RA/RC:
• Beginning at 10% of the nominal output voltage, the voltage must rise within
> 0.1 ms to < 20 ms to the specified regulation range of the voltage. Typically:
> 5 ms to < 15 ms.
• There must be a smooth and continuous ramp of each DC output voltage from
10% to 90% of the regulation band.
• The slope of the turn-on waveform shall be a positive, almost linear voltage increase and
have a value from 0 V to nominal Vout.
5.1.3.2
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. Both voltages must reach their minimum in-regulation level not
later than 20 ms after the output power ramp start.
5.1.3.3
Tolerance
The tolerance of the voltage lines is described in the CompactPCI specification (PICMG 2.0
R3.0). The recommended measurement point for the voltage is the CompactPCI connector on
the CPU board. The following table provides information regarding the required characteristics
for each board input voltage.
Table 5-3:
Input Voltage Characteristics
VOLTAGE
NOMINAL VALUE
5 V
3.3 V
+12 V
-12 V
VI/O (PCI) voltage
+3.3 VDC or +5 VDC
GND
The output voltage overshoot generated during the application (load changes) or during the re-
moval 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.
Page 5 - 4
TOLERANCE
+5.0 VDC
+5%/-3%
+3.3 VDC
+5%/-3%
+12 VDC
+5%/-5%
-12 VDC
+5%/-5%
+5%/-3%
Ground, not directly connected to potential earth (PE)
CP6003-RA/RC
MAX. RIPPLE (p-p)
50 mV
50 mV
240 mV
240 mV
50 mV
ID 1046-3890, Rev. 1.0
REMARKS
Main voltage
–
Required
Not required
–
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