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首页 > 产品中心 > LED驱动电路 > LCD驱动芯片 > 液晶显示驱动 >CXLC8997通电延迟时间和栅极导通电压下降时间均由外部电容和电阻编程电压检测器监测电源电压在检测到的电压过低时发出复位信号检测电平由外部电阻分压器决定延迟时间由外部电容器编程
CXLC8997通电延迟时间和栅极导通电压下降时间均由外部电容和电阻编程电压检测器监测电源电压在检测到的电压过低时发出复位信号检测电平由外部电阻分压器决定延迟时间由外部电容器编程
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CXLC8997 CXLC8998包括用于有源矩阵薄膜晶体管(TFT)液晶显示器(LCD)的高性能升压调节器、栅极脉冲调制器(GPM)、电压检测器和VCOM缓冲器(单位增益OPA)。boost转换器为面板源驱动器ic提供稳压电源。该转换器是一个高开关频率(640kHz或1.2MHz)电流模式稳压器,集成20V N沟道0.2ΩMOSFET,允许使用超小型电感和陶瓷电容。它提供了对脉冲加载的快速瞬态响应,同时达到了90%以上的效率。该装置能从低至2.8V的输入端产生高达18V的输出电压,软启动由外部电容器编程,设置输入电流的斜坡率。GPM由来自定时控制器的帧信号控制,以调制栅极导通电压VGHM,VGHM起到闪烁补偿电路的作用,以减小栅极线和像素之间的耦合效应。它还可以在通电时延迟栅极导通电压,以实现栅极驱动芯片的校正通电顺序。通电延迟时间和栅极导通电压下降时间均由外部电容和电阻编程。电压检测器监测电源电压,在检测到的电压过低时发出复位信号。检测电平由外部电阻分压器决定,延迟时间由外部电容器编程。VCOM缓冲器可以驱动LCD VCOM电压,该电压具有高短路电流(150mA)、快速转换速率(12V/μs)、宽带宽(12MHz)和轨对轨输入/输出。

CXLC8997通电延迟时间和栅极导通电压下降时间均由外部电容和电阻编程电压检测器监测电源电压在检测到的电压过低时发出复位信号检测电平由外部电阻分压器决定延迟时间由外部电容器编程
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1.产品概述       2.产品特点     Wkj嘉泰姆

3.应用范围       4.技术规格书下载(PDF文档)Wkj嘉泰姆

5.产品封装       6.电路原理图  Wkj嘉泰姆

7.相关产品Wkj嘉泰姆

   产品概述 返回TOPWkj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TOPWkj嘉泰姆


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

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

Š Fast Transient Response to Pulse Load Wkj嘉泰姆

Š ±1% Accurate Output Voltage Wkj嘉泰姆

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

Š High Efficiency up to 90% Wkj嘉泰姆

Š Programmable Soft-Start Wkj嘉泰姆

Š Over-Current Protection Wkj嘉泰姆

Š Output Under-Voltage Protection Wkj嘉泰姆

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

Š 12V/μs Slew Rate Wkj嘉泰姆

Š 12MHz, -3dB Bandwidth Wkj嘉泰姆

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

„ On-Chip GPM Controller Wkj嘉泰姆

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

Š Flicker Compensator Wkj嘉泰姆

Š Power-On Sequence Control Wkj嘉泰姆

„ Low Voltage Detector Wkj嘉泰姆

 Š Programmable Detecting Voltage and Delay Time Wkj嘉泰姆

„ Charge pump for VGH regulation Wkj嘉泰姆

„ Thermal-Overload Protection Wkj嘉泰姆

„ RoHs Compliant Wkj嘉泰姆

„ TQFN4X4-24 PackageWkj嘉泰姆

   应用范围 返回TOPWkj嘉泰姆


„ LCD Monitor Wkj嘉泰姆

„ Notebook Computer Displays Wkj嘉泰姆

„ LCD TVsWkj嘉泰姆

   技术规格书(产品PDF) 返回TOP Wkj嘉泰姆


     需要详细的PDF规格书请扫一扫微信联系我们,还可以获得免费样品以及技术支持!Wkj嘉泰姆

 QQ截图20160419174301.jpgWkj嘉泰姆

产品封装图 返回TOPWkj嘉泰姆


image.pngWkj嘉泰姆

电路原理图 返回TOPWkj嘉泰姆


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