CP3005 – User Guide Rev. 1.8
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Power Considerations
5.1.
CP3005 Voltage Ranges
The CP3005 has been designed for optimal power input and distribution. Still it is necessary to observe certain criteria
essential for application stability and reliability.
The system power supply must comply with the CompactPCI® specification.
The following table specifies the ranges for the input power voltage within which the board is functional.
Table 36: DC Operational Input Voltage Range
Input Supply Voltage
Absolute Range
Percentage
+3.3 V
3.2 V min. to 3.47 V max.
-3.1%/+4.9%
+5 V
4.85 V min. to 5.25 V max.
-3.0%/+4.8%
+12 V
11.4 V min. to 12.6 V max.
-5.2%/+4.8%
-12 V
-11.4 V min. to -12.6 V max.
-5.2%/+4.8%
Failure to comply with the instructions above may result in damage to the board or improper
operation.
5.2.
Start-Up Requirement
Power supplies must comply with the following guidelines, in order to be used with the CP3005:
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.
5.3.
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.
5.4.
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.
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 proportionately 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 CP3005.
Failure to comply with above may result in damage to the board or improper system
operation.
