Power Considerations
CP690HS
Page 6 - 6
ID 20955, Rev. 05
P R E L I M I N A R Y
6.4.4
Recommended Operating Conditions
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 CP690HS.
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.
The following table provides information regarding the required characteristics for each board
input voltage.
6.4.5
Supply Voltage 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)
5 V
5.0 VDC
+5%/-3%
50 mV
3.3 V
3.3 VDC
+5%/-3%
50 mV
+12 V
+12 VDC
+5%/-5%
240 mV
-12 V
-12 VDC
+5%/-5%
240 mV
VI/O
(PCI signaling voltage)
3.3 VDC or 5 VDC
+5%/-3%
50 mV
GND
Ground, not directly connected to protective earth (PE)
Note ...
Non-industrial ATX PSUs require a greater minimum load than a single
CP690HS is capable of creating. When a PSU of this type is used, it will not
power up correctly and the CP690HS 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 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 has gone 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.
Summary of Contents for CP690HS
Page 17: ...CP690HS Introduction ID 20955 Rev 05 Page 1 1 Introduction Chapter 1 1 P R E L I M I N A R Y...
Page 39: ...Installation Chapter 1 3 ID 20955 Rev 05 Page 3 1 CP690HS Installation P R E L I M I N A R Y...
Page 47: ...Configuration ID 20955 Rev 05 Page 4 1 CP690HS Configuration P R E L I M I N A R Y Chapter 1 4...
Page 51: ...Hot Swap ID 20955 Rev 05 Page 5 1 CP690HS Hot Swap P R E L I M I N A R Y Chapter 1 5...
Page 73: ...CP RIO6 90 ID 20955 Rev 05 Page A 1 CP690HS CP RIO6 90 P R E L I M I N A R Y Appendix A...
