Filter
Top Products
Chapter 4. Power supply
Chapter 4. Power supply
The power supply requirements are supplied by a 145-watt power supply. The power supply provides
3.3-volt power for the system memory, Super I/O, and core chip set and 5-volt power for PCI adapters, the
hard disk, and diskette drive. Also included is an auxiliary 5-volt (AUX 5) supply to provide power to
power standby circuitry and 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 system board 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 and 5 V power should not exceed 100 watts.
Figure 8. Power Input Requirements
Specification Measurements
Input voltage, low range 100 (min) to 127 (max) V AC
Input voltage, high range 200 (min) to 240 (max) V AC
Input frequency 50 Hz ± 3 Hz or 60 Hz ± 3 Hz
Figure 9. Power Output (145 Watt)
Output voltage Regulation Minimum current Maximum current
+5 volts +5% to −5% 1.5 A 18.0 A
+12 volts +5% to −5% 0.02 A 4.2 A
−12 volts +10% to −10% 0.0 A 0.4 A
+3.3 volts +5% to −5% 0.0 A 10.0 A
+5 volt (auxiliary) +5% to −5% 0.0 A 0.720 A
Copyright IBM Corp. September 1999 17