CXLC8997 CXLC8998 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

   产品概述 返回TOP8kt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TOP8kt嘉泰姆

„ 2.5V to 5.5V Input Supply Range 8kt嘉泰姆

„ 640kHz/1.2MHz Current-Mode Boost Regulator 8kt嘉泰姆

Š Fast Transient Response to Pulse Load 8kt嘉泰姆

Š ±1% Accurate Output Voltage 8kt嘉泰姆

Š Built-In 20V/2A, 0.2Ω N-Channel MOSFET 8kt嘉泰姆

Š High Efficiency up to 90% 8kt嘉泰姆

Š Programmable Soft-Start 8kt嘉泰姆

Š Over-Current Protection 8kt嘉泰姆

Š Output Under-Voltage Protection 8kt嘉泰姆

„ High-Performance Operational Amplifiers ±150mA Output Short-Circuit Current 8kt嘉泰姆

Š 12V/μs Slew Rate 8kt嘉泰姆

Š 12MHz, -3dB Bandwidth 8kt嘉泰姆

Š Rail-to-Rail Input and Output 8kt嘉泰姆

„ On-Chip GPM Controller 8kt嘉泰姆

Š Adjustable Falling Time and Power-On Delay 8kt嘉泰姆

Š Flicker Compensator 8kt嘉泰姆

Š Power-On Sequence Control 8kt嘉泰姆

„ Low Voltage Detector 8kt嘉泰姆

 Š Programmable Detecting Voltage and Delay Time 8kt嘉泰姆

„ Charge pump for VGH regulation 8kt嘉泰姆

„ Thermal-Overload Protection 8kt嘉泰姆

„ RoHs Compliant 8kt嘉泰姆

„ TQFN4X4-24 Package8kt嘉泰姆

   应用范围 返回TOP8kt嘉泰姆

„ LCD Monitor 8kt嘉泰姆

„ Notebook Computer Displays 8kt嘉泰姆

„ LCD TVs8kt嘉泰姆

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