Power and Environmental Specifications
Intel
®
Server Board S5500BC TPS
Intel order number: E42249-003
Revision 1.0
70
8.2.1
Power Requirements
The power supply generates power at +5 V, +3.3 V, +12 V, -12 V, and +5 VSB (standby). The
other required voltages on the Intel
®
Server Board S5500BC Server are generated using the
linear and switching regulators. An external potentiometer is used to margin the critical voltages
by +/- ±5%. The following table summarizes the maximum power requirements for all on-board
and peripheral devices, as well as the system, for proper operation. The total power requirement
for the board is calculated as follows. The main power supply connector pr12 V, -12 V,
+3.3 V, and +5.0 V. Other voltages are derived using switching regulators. In order to select the
power supply, it is important to know the current rating requirement for each of the voltage rails.
The maximum power required to operate the server board under normal conditions with
peripherals is about 80% of the total worst case power dissipation or 503 W. This includes a
15% regulator efficiency.
8.2.2 Turn On No Load Operation
At power on, the system should present a no load condition to the power supply. In this state,
the voltage regulation limits for the 3.3 V and 5 V are relaxed to +/-10%, and the +12 V rail limits
are relaxed to +10/-8%. When operating loads are applied, the voltages must regulate within
normal limits.
Table 34. No load Operating Range
Voltage
Minimum Continuous
Maximum Continuous
Peak
+3.3 V
0 A
7 A
+5 V
0 A
5 A
+12 V
1
0 A
5 A
7 A
+12 V
2
0 A
5 A
7 A
+12 V
3
0 A
6 A
+12 V
4
0 A
5 A
-12 V
0 A
0.5 A
+5 VSB
0.1 A
3.0 A
3.5 A
Notes:
1. Maximum continuous total DC output power should not exceed 400 W.
2. Peak load on the combined 12 V output should not exceed 49 A.
3. Maximum continuous load on the combined 12 V output should not exceed 44 A.
4. Peak total DC output power should not exceed 650 W.
8.2.3 Grounding
The grounds of the pins of the power supply output connector provide the power return path.
The output connector ground pins should be connected to safety ground (power supply
enclosure).
