IBM PC 300PL User Manual download pdf (Page 26)

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

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IBM PC 300PL User Manual Page 26