PXIe Chassis Family
User Guide
49
5 Power Supply Operation
The Primary Power Module (PPM) provides the six voltage rails listed below. The
name of each voltage rail as it appears on the chassis backplane connectors is
shown in the second column. The image in the following section shows these
voltage rails in a block diagram format, and describes the power available from
each rail.
Note that two of the rails, 5 V
aux
and Fan 12 Vdc, are active (powered) whenever
the chassis is connected to AC power. The remaining rails are switched on or off
either by the front panel power push button or by the INHIBIT signal on the rear
panel DB-9 connector.
Table 4 Primary Power Module DC Voltage Rails
Voltage Rails Backplane Name Comments
3.3 Vdc 3.3V This rail can be switched on/off, either by the front panel power push button or the
INHIBIT signal on the rear panel DB-9 connector.
1
5 Vdc 5V
The 5 Vdc rail connects to the 5V pins of the CompactPCI XP1 connector. A
DC-to-DC converter generates this voltage rail from the 12 Vdc rail.
1
5V V
IO
The 5 Vdc rail also connects to the 5V V(I/O) pins of the CompactPCI XP1
connector.
12 Vdc 12V This rail can be switched on/off, either by the front panel power push button or the
INHIBIT signal on the rear panel DB-9 connector.
1
–12 Vdc –12V This rail can be switched on/off, either by the front panel power push button or the
INHIBIT signal on the rear panel DB-9 connector.
1
5 Vdc auxiliary 5V
aux
2
This rail provides standby power to the Monitor Processor and the modules, and is
available anytime the chassis is connected to AC power.
Fan 12 Vdc Fan 12V This rail supplies the fan driver circuitry, and is not connected to the backplane and
cannot be measured at the rear panel DB-9 connector. This power supply is active
anytime the chassis is connected to AC power.
1
The 3.3Vdc, 5Vdc, 12 Vdc, and the –12Vdc rails can be switched on/off, either by the front panel power push button or by the INHIBIT signal
on the rear panel DB-9 connector. The 5V rail regulators is fed by the +12Vdc.
2
In the PXIe Chassis Family Soft Front Panel, the +5Vaux is shown as +5.0V_STANDBY.
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