EXPANSION CHASSIS
PCIe2-2711 PCI Express Gen2 Expansion System User’s Manual
3-3
Revision 1.1, October 2017
Users of the N+1 chassis or those using their own chassis and power supplies need to be aware of the
minimum loading requirements. The 1200W chassis minimum loading can be net by using the on-
board jumpers. The N+1 chassis will need to have cards installed to meet the +12V minimum loading.
Table 3-2 and Table 3-3 summarize the minimum loading requirements.
Table 3-2. 1200W Power Supply Minimum Loading
Table 3-3. 2180W/3240W Power Supply Minimum Loading
3.6
POWER CONSIDERATIONS
Table 3-4 through 3-6 show the power consumption for the Cyclone Microsystems boards and the
power supplied to PCI Express slots. Note that the PCIe-426 is installed in and powered by the host
supply. Consequently, the PCIe-426 should not be included as a component of the Expansion Chassis
power budget.
Table 3-4. PCIe- 460 Power Requirements
Voltage
Minimum Load
Status
+5VSB
0A
On board circuitry meets power supply minimum.
+5V
0A
On board circuitry meets power supply minimum.
+3.3V
0A
On board circuitry meets power supply minimum.
+12V
0.6A
Jumpers Z3 and Z5 can be used to meet power supply
minimum, 0.5A per jumper.
Voltage
Minimum Load
Status
+5VSB
0.1A
On board circuitry meets power supply minimum.
+5V
1A
Install Jumper Z4 to meet power supply minimum.
+3.3V
1A
On board circuitry meets power supply minimum.
+12V
6A
Cards must be installed to meet minimum load.
Jumpers Z3 and Z5 can be used to help meet power
supply minimum, 0.5A per jumper.
Voltage
Current
Typical
Current
Maximum
Note
+5VSB
0.1A
0.1A
Not used. On board circuitry sets current draw.
+5V
0.5A
1A
Not used. On board circuitry draws 0.5A and
Jumper Z4 can add another 0.5A.
+3.3V
2.5A
3.0A + 24A
Maximum is PCIe-460 circuitry plus 8 slots x
3A per slot =24A.
+12V
1A
2A + 44A
Maximum is PCIe-460 circuitry plus 8 slots x
5.5A per slot = 44A.
