© Copyright IBM Corp. 2000 21
Chapter 4. Power supply
The NetVista small form factor desktop model computer uses a 110-watt power
supply. The NetVista desktop model computer uses a 155-watt power supply. The
power supply provides power for the Pentium III microprocessor, core chip set, and
PCI adapters. Also included is an auxiliary 5-volt (AUX 5) supply to provide power to
power-management circuitry and the Wake on LAN feature. The power supply
converts the ac input voltage into five dc output voltages and provides power for the
following:
• System board
• Memory card
• 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-pin by 10-pin connector.
Power input
The following tables show the power-input specifications for the 155-watt and 110-watt
power supplies.
Power output
The power supply outputs shown in the following figures include the current-supply
capability of all the connectors, including system board, direct access storage drive
(DASD), PCI, and auxiliary outputs.
Table 3. Power input requirements for the 155-watt power supply
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 or 60 Hz ± 3 Hz
Table 4. Power input requirements for the 110-watt power supply
Specification Measurements
Input voltage 90 (min) to 265 (max) V ac
Input frequency 50 Hz ± 3 or 60 Hz ± 3 Hz
Table 5. Power output for the 155-watt power supply
Output voltage Regulation Minimum current Maximum current
+5 volts +5% to −4% 0.2 A 15.0 A
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