Power Supply - Toshiba Satellite E200 Maintenance Manual

1.5 Power Supply

1.5 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 White).
 Battery indicator (in White or Umber or Umber 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/E200/E205
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Maintenance Manual
1 Hardware Overview
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