Power Supply - Toshiba Satellite A105-S4547 Maintenance Manual

1.7 Power Supply

1.7 Power Supply
The power supply unit provides many different voltages for the system board and performs the following
functions:
1. Power input monitor
? Checks whether the DC power supply (AC adapter) is connected to the computer.
? Checks whether the battery pack is connected to the computer.
? Monitors the DC power supply input voltage (AC Adapter output voltage).
2. Power supply's internal control
? Turns on and off the battery pack charging power supply.
? Issues a charging current instruction to the PWM control IC of the battery pack charging power
supply.
? Controls the supply of DC power supply input (AC Adapter output) to the power supply unit.
? Controls the supply of power to the system block (load/logic circuit side).
? Controls forced shutdown if the power supply malfunctions.
3. Logic circuit control
? Instructs the gate array to enable/disable tuning the power on.
? Controls power-on/off operation.
4. Status display
? Turns on the Power LED (in Blue or Green or AMBER).
? Battery indicator (in Blue or Green or AMBER or AMBER Flash).
5. External interface
? Performs communication through the I2C bus (via the internal EC/KBC).
? Transfers the power supply operation mode.
6. Output monitor
? Monitors the voltage output to the system block (load/logic circuit side).
? Monitors the voltage, over voltage, input/output current of the battery pack.
? Monitors the internal temperature of the battery pack.
? Monitors the supply voltage from the AC adapter.
Satellite A100/A105 / TECRA A7 Maintenance Manual
1 Hardware Overview
19