Back-light source driver for liquid crystal display screen

The utility model relates to an integrated backlight source driver in LCD, where a cold cathode fluorescent backlight driver and a switch are integrated into a compact circuit. The compact circuit is used for driving the cold cathode fluorescent lamps of LCD TV and LCD backlight source. The utility model is composed of a thick film integrated circuit, three magnetic core transformers, a four lamp output circuit, a controlling silicon, a semiconductor transistor, a semiconductor diode, a resistor, a capacitor, a connector, a common mode inductor, a fuse and a bridge rectifier. The 220V AC passes the bridge rectifier and then is changed into a DC of plus and minus 150V to respectively supply for the switch power supply circuit centered by the integrated circuit IC1, a magnetic core transformer T1 and a magnetic core transformer T2, as well as the cold cathode fluorescent backlight source driving circuit centered by an integrated circuit IC2, a magnetic core transformer T3 and an equalized current circuit M ; The utility model solves the problem that the low power supply efficiency of low switch power voltage (12V DC) to the cold cathode fluorescent backlight source driving circuit. The utility model is also high in power efficiency, small in integration size and balanced in lamp current.