TFT LCD for TV Panel


     The ANX6861 is an integrated power supply solution optimized for large thin-film transistor (TFT) liquid crystal display (LCD) TV panels which  includes all voltage rails for the TFT LCD bias ( AVDD, VGH, VGL, Vcom ) and also a buck regulator for system logic supply. It is especially designed for 12V input. For better display quality control, the device also provides Gate-Pulse-Modulation block and high accuracy Gamma voltage reference for driver IC.

     The boost regulator provides TFT source driver AVDD voltage. The integrated N-channel FET operates at a fixed frequency of 500k/750kHz which has a current limit up to 4.2A and can support output voltages up to 20V.

     The buck regulator supplies system logic power with a current limit of 3.2A, it includes an internal power MOSFET and fixed-frequency operation allowing the use of small inductors and capacitors. Both boost and buck regulators feasure internal soft-start function to limit inrush current and use current mode control to perform fast load transient response The buck regulator is compensated internally and the boost regulator is compensated by an external RC network.

     The gate-on and gate-off charge pumps provide TFT-LCD gate drivers regulated gate-on and gate-off supplies. Both outputs can be adjusted by external resistive voltage dividers. Internal soft-start function is also included.

The integrated operational amplifier is typically used for LCD Vcom driving, it features fast slew rate, wide bandwidth, and rail-to-rail output which can sink or source up to 200mA.

     The GPM is a flicker compensation circuit to reduce the coupling effect of gate lines; the gate-shaping timing is controlled by the timing-controller to modulate the Gate-On voltage, VGHM.

     The high voltage Gamma reference ensures a stable voltage to generate the Gamma correction voltages.

     The ANX6861 is available in a thin 48-pin 7x7 mm WQFN green package.


8V to 16.5V input supply

Current-mode boost regulator

500k/750KHz selectable frequency

Integrated 20V/4.2A 100m FET

Fast transient response to pulsed load

High efficiency up to 90%

Adjustable soft-start

Adjustable current limit for over current    protection

Adjustable high-accuracy output voltage

Over voltage protection

Current-mode buck regulator

Integrated 20V/3.2A 100m FET

Fast transient response

Internal compensation

High efficiency

Internal 3ms soft-start

Adjustable high-accuracy output voltage

VGH positive charge pump controller

VGL negative charge pump controller

High voltage LDO for Gamma reference

Adjustable high-accuracy output voltage

Low drop-out voltage at 60mA output current (0.25V)

Integrated high performance operational amplifier

±200mA output short-circuit current

45V/us fast slew rate

Low-voltage detection circuit

GPM controller 

Adjustable falling time

Adjustable turn-on delay

External gate control for AVDD sequencing

Thermal shutdown

Thin 7x7 mm 48-lead TQFN package 


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