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Qosmio X300 Maintenance Manual 1-14
1.4 Power 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 Shows DC-IN (Red Color)
y Shows Power (Red/Amber)
y Shows Main Battery charging (Red/Amber Color).
5. External interface
y Performs communication through the I2C bus (via the internal EC/KBC).
y Transfers the power supply operation mode.
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