IBM PC 300GL manual Power supply, Power input, Power output

Chapter 4. Power supply

A145-watt power supply drives your computer. The power supply provides 3.3-volt power for the Pentium III microprocessor, core chip set, and 5-volt power for PCI adapters. Also included is an auxiliary 5-volt (AUX 5) power 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 pin connector.

Power input

The following table shows the power input specifications. The power supply has a manual switch to select the correct input voltage.

Table 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

Power output

The following figures show the power supply output of all the connectors, including the system board, DASD, PCI, and auxiliary outputs.

Table 9. Power output (145 watts)

Output voltage	Tolerance	Minimum current	Maximum current
+5 V dc	+5% to -5%	1.5 A	18.0 A
+12 V dc	+5% to -5%	0.02 A	4.2 A
-12 V dc	+10% to -10%	0.0 A	0.4 A
+3.3 V dc	+5% to -5%	0.0 A	10.0 A
+5 V ac (auxiliary)	+5% to -5%	0.0 A	0.720 A

The total combined 3.3 V and 5 V power must not exceed 100 watts.

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