Toshiba TOSHIBA NB100 manual Hardware Overview Power Supply

1 Hardware Overview 1.5 Power Supply

1.5Power Supply

The power supply unit provides many different voltages for the system board and performs the following functions:

1. Power input monitor

yChecks whether the DC power supply (AC adapter) is connected to the computer.

yChecks whether the battery pack is connected to the computer.

yMonitors the DC power supply input voltage (AC Adapter output voltage).

2.Power supply's internal control

yTurns on and off the battery pack charging power supply.

yIssues a charging current instruction to the PWM control IC of the battery pack charging power supply.

yControls the supply of DC power supply input (AC Adapter output) to the power supply unit.

yControls the supply of power to the system block (load/logic circuit side).

yControls forced shutdown if the power supply malfunctions.

3.Logic circuit control

yInstructs the gate array to enable/disable tuning the power on.

yControls power-on/off operation.

4.Status display

yTurns on the Power LED (in Green).

yBattery indicator (in Green).

5.External interface

yPerforms communication through the I2C bus (via the internal EC/KBC).

yTransfers the power supply operation mode.

6.Output monitor

yMonitors the voltage output to the system block (load/logic circuit side).

yMonitors the voltage, over voltage, input/output current of the battery pack.

yMonitors the internal temperature of the battery pack.

yMonitors the supply voltage from the AC adapter.

18 TOSHIBA NB100 Maintenance Manual