Toshiba A500D/PRO A500DPRO A500D Manual Do Utilizador

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

1.  Power input monitor 

  Checks whether the AC adapter (DC power supply) 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 Amber). 

  DC-IN indicator (in White color)  

5.  External interface 

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

  Transfers the power supply operation mode.