Can anyone elaborate the following schematic (Attached) ? It is used to control the Backlite of an LCD. The Collector of the Transistor is connected to the cathode of LCD backlight. The LCD_BLED is the control Pin and VCC_SYS is the Supply voltage of the LCD (Anode of the LCD Backlight is also connected to VCC_SYS). What is the need of making the driving circuit so complicated,a simple MOSFET can not be used instead ?
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