Toshiba PROL450D 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 



  Battery indicator (in green or amber). 



  DC-IN indicator (in green color)  

5.  External interface 



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



  Transfers the power supply operation mode.