Lenovo PC 300PL Techical Information Manual - Page 26

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. Figure 7. Power-input requirements Specification Input voltage, low range Input voltage, high range Input frequency Measurements 100 (min) to 127 (max) V AC 200 (min) to 240 (max) V AC 50 Hz ± 3 Hz or 60 Hz ± 3 Hz 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. Figure 8. Power-output (145 watts) Output voltage Regulation +5 volts +5% to −4% +12 volts +5% to −5% −12 volts +10% to −9% +3.3 volts ±2% −5 volts ±10% +5 volt (auxiliary) +5% to −5% Minimum current 1.5 A 0.2 A 0.0 A 0.0 A 0.0 A 0.0 A Maximum current 18.0 A 4.2 A 0.4 A 10.0 A 0.3 A 0.02 A Note: The total combined 3.3 V and 5 V power must not exceed 100 watts. 18 © Copyright IBM Corp. September 1999