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Chapter 4. Power supply
Chapter 4. Power supply
The power-supply requirements are supplied by 145-watt PC 300PL Personal Computer power supply.
The power supply provides 3.3-volt power for the Pentium microprocessor and core chip set and 5-volt
power for PCI adapters. Also included is an auxiliary 5-volt (AUX 5) supply to provide power to
power-management 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 power-input 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.
Note: The total combined 3.3 V and 5 V power must not exceed 100 watts.
Figure 7. 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 8. Power-output (145 watts)
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
+3.3 volts ±2% 0.0 A 10.0 A
−5 volts ±10% 0.0 A 0.3 A
+5 volt (auxiliary) +5% to −5% 0.0 A 0.02 A
18 Copyright IBM Corp. September 1999