IBM 6275 - PC 300 GL, Technical Information Manual, Page: 36 / 88

Chapter 4. Power Supply
Chapter 4. Power Supply
The power supply requirements are supplied by 145-watt PC 300 Types 6275/6862 (desktop models) or
200-watt PC 300 Types 6285/6892 (tower models) power supply. The power supply provides 3.3-volt
power for the Pentium microprocessor and core chip set and 5-volt power for ISA and PCI adapters. Also
included is an auxiliary 5-volt (AUX 5) supply to provide power to power management circuitry and the
system board Ethernet function, or 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 riser card 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.
PC 300GL Type 6275 and PC 300PL Type 6862
The total combined 3.3 V/5 V power should not exceed 100 watts.
Figure 11. Power Input Requirements
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 Hz or 60 Hz
±
3 Hz
Figure 12. Power Output (145 Watt)
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
−
5 volts +10% to
−
10% 0.0 A 0.3 A
+3.3 volts +2% to
−
2% 0.0 A 10.0 A
+5 volt (auxiliary) +5% to
−
10% 0.02 A .720 A
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Copyright IBM Corp. June 1998