Chapter 4. Power Supply
Chapter 4. Power Supply
The power supply requirements are supplied by 145-watt IntelliStation E Pro power supply. The power
supply provides 3.3-volt power for the Pentium microprocessor and core chip set and 5-volt power for ISA
and PCI adapters. Also included is an auxiliary 5-volt (AUX 5) supply to provide power to power
management circuitry and the system board Ethernet function, or a Wake on LAN adapter. The power
supply converts the ac input voltage into four dc output voltages and provides power for the following:
System board
Adapters
Internal drives
Keyboard and auxiliary devices
USB devices
A logic signal on the power connector controls the power supply; the front panel switch is not directly
connected to the power supply.
The power supply connects to the riser card with a 2 x 10 connector.
Power Input
The following figure shows the input power specifications. The power supply has a manual switch to
select the correct input voltage.
Power Output
The power supply outputs shown in the following figures include the current supply capability of all the
connectors, including system board, DASD, PCI, and auxiliary outputs.
The total combined 3.3 V/5 V power should not exceed 100 watts.
Figure 11. Power Input Requirements
Specification
Measurements
Input voltage, low range
90 (min) to 137 (max) V ac
Input voltage, high range
180 (min) to 265 (max) V ac
Input frequency
50 Hz
±
3 Hz or 60 Hz
±
3 Hz
Figure 12. Power Output (145 Watt)
Output Voltage
Regulation
Minimum Current
Maximum Current
+5 volts
+5% to
−
4%
1.5 A
18.0 A
+12 volts
+5% to
−
5%
0.2 A
4.2 A
−
12 volts
+10% to
−
9%
0.0 A
0.4 A
−
5 volts
+10% to
−
10%
0.0 A
0.3 A
+3.3 volts
+2% to
−
2%
0.0 A
10.0 A
+5 volt (auxiliary)
+5% to
−
10%
0.02 A
.720 A
Copyright IBM Corp. September 1998
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