Toshiba A350 manual Power Supply

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1.4Power Supply

The power supply unit provides constant voltage 19V for the system board and performs the following functions:

1.Power input monitor

y Checks whether the AC adapter (DC power supply) is connected to the computer. y Checks whether the battery pack is connected to the computer.

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

2.Power supply's internal control

y Turns on and off the battery pack charging power supply.

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

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

y Controls the supply of power to the system block (load/logic circuit side). y Controls forced shutdown if the power supply malfunctions.

3.Logic circuit control

y Instructs the gate array to enable/disable tuning the power on. y Controls power-on/off operation.

4.Status display

y Turns on the Power LED (in White).

y Battery indicator (in White or AMBER). y DC-IN indicator (in White color)

5.External interface

y Performs communication through the I2C bus (via the internal EC/KBC). y Transfers the power supply operation mode.

Satellite A350 Maintenance Manual 1-14