产品概述 返回TOPw4l嘉泰姆

The CXLC8997 CXLC8998 includes a high-performance boost regulator, a gate pulse modulator (GPM), a voltage detector, and a VCOM buffer (unity-gain OPA), for activematrix thin-film transistor (TFT) liquid-crystal displays (LCDs). The boost converter provides the regulated supply voltage for the panel source driver ICs. The converter is a high switching frequency (640kHz or 1.2MHz) currentmode regulator with an integrated 20V N-Channel 0.2Ω MOSFET that allows the use of ultra-small inductors and ceramic capacitors. It provides fast transient response to pulsed loading while achieving efficiency over 90%. The device can produce output voltage as high as 18V from an input as low as 2.8V. Soft-Start is programmed by external capacitor, which sets the input-current ramp-rate. The GPM is controlled by frame signals from timing controller to modulate the Gate-On voltage, VGHM, which acts a flicker compensation circuit to reduce the coupling effect between gate lines and pixels. It also can delay the Gate-On voltage while power-on for achieving a corrected power-on sequence for gate driver ICs. Both of power-on delay time and the falling time of the Gate-On voltage are programmable by external capacitor and resistor. The voltage detector monitors the supply voltage to issue a reset signal while the detected voltage is too low. The detecting level is decided by an external resistor divider and the delay time is programmable by an external capacitor. The VCOM buffer can drive the LCD VCOM voltage that features high short-circuit current (150mA), fast slew rate (12V/μs), wide bandwidth (12MHz) and rail-to-rail input/output.

   产品特点 返回TOPw4l嘉泰姆

„ 2.5V to 5.5V Input Supply Range w4l嘉泰姆

„ 640kHz/1.2MHz Current-Mode Boost Regulator w4l嘉泰姆

Š Fast Transient Response to Pulse Load w4l嘉泰姆

Š ±1% Accurate Output Voltage w4l嘉泰姆

Š Built-In 20V/2A, 0.2Ω N-Channel MOSFET w4l嘉泰姆

Š High Efficiency up to 90% w4l嘉泰姆

Š Programmable Soft-Start w4l嘉泰姆

Š Over-Current Protection w4l嘉泰姆

Š Output Under-Voltage Protection w4l嘉泰姆

„ High-Performance Operational Amplifiers ±150mA Output Short-Circuit Current w4l嘉泰姆

Š 12V/μs Slew Rate w4l嘉泰姆

Š 12MHz, -3dB Bandwidth w4l嘉泰姆

Š Rail-to-Rail Input and Output w4l嘉泰姆

„ On-Chip GPM Controller w4l嘉泰姆

Š Adjustable Falling Time and Power-On Delay w4l嘉泰姆

Š Flicker Compensator w4l嘉泰姆

Š Power-On Sequence Control w4l嘉泰姆

„ Low Voltage Detector w4l嘉泰姆

 Š Programmable Detecting Voltage and Delay Time w4l嘉泰姆

„ Charge pump for VGH regulation w4l嘉泰姆

„ Thermal-Overload Protection w4l嘉泰姆

„ RoHs Compliant w4l嘉泰姆

„ TQFN4X4-24 Packagew4l嘉泰姆

   应用范围 返回TOPw4l嘉泰姆

„ LCD Monitor w4l嘉泰姆

„ Notebook Computer Displays w4l嘉泰姆

„ LCD TVsw4l嘉泰姆

   技术规格书（产品PDF) 返回TOP w4l嘉泰姆

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