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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 >CXLC8996A高性能升压调节器4通道LED驱动器低损耗线性调节器LDO门脉冲调制器GPM电压检测器VCOM缓冲器用于有源矩阵薄膜晶体管TFT液晶显示器LCD的VGH电荷泵控制器高开关频率1.2MHz电流模式稳压器集成20V N沟道0.2ΩMOSFET
CXLC8996A高性能升压调节器4通道LED驱动器低损耗线性调节器LDO门脉冲调制器GPM电压检测器VCOM缓冲器用于有源矩阵薄膜晶体管TFT液晶显示器LCD的VGH电荷泵控制器高开关频率1.2MHz电流模式稳压器集成20V N沟道0.2ΩMOSFET
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CXLC8996A包括高性能升压调节器、4通道LED驱动器、低损耗线性调节器(LDO)、门脉冲调制器(GPM)、电压检测器、VCOM缓冲器(单位增益OPA)和用于有源矩阵薄膜晶体管(TFT)液晶显示器(LCD)的VGH电荷泵控制器。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。LED驱动器自动调节LED灯条的电源电压,无需计算不同LED类型的输出。使用FREQ2管脚在640kHz到2MHz的范围内调整开关频率。它还集成了一个提供高输出功率的40V n沟道MOSFET。四通道电流驱动器是恒流驱动的理想选择,匹配度小于3%。为了设置最大驱动电流,ISET引脚用于确定参考电流。电流驱动器的每个通道被设置为该参考电流的1300倍。可以使用一个PWM管脚在100Hz到20kHz的范围内进行PWM调光。开路LED串自动禁止通道进入过电压保护。低压差(LDO)线性稳压器在输入电压为3.3V时能提供高达350mA的电流,采用内部PMOS作为通电器件。适用于定时控制器的供电电压。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。VGH电荷泵控制器提供可调节的TFT栅极开启电压。正电荷泵的调节由内部比较器产生,该比较器感测输出电压并将其与内部参考电压进行比较

CXLC8996A高性能升压调节器4通道LED驱动器低损耗线性调节器LDO门脉冲调制器GPM电压检测器VCOM缓冲器用于有源矩阵薄膜晶体管TFT液晶显示器LCD的VGH电荷泵控制器高开关频率1.2MHz电流模式稳压器集成20V N沟道0.2ΩMOSFET
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目录

1.产品概述       2.产品特点     oMz嘉泰姆

3.应用范围       4.技术规格书下载(PDF文档)oMz嘉泰姆

5.产品封装       6.电路原理图  oMz嘉泰姆

7.相关产品oMz嘉泰姆

   产品概述 返回TOPoMz嘉泰姆


The CXLC8996A includes a high-performance boost regulator, 4-channel LED driver, a low dropout linear regulator (LDO), a gate pulse modulator (GPM), a voltage detector, a VCOM buffer (unity-gain OPA), and a VGH charge pump controller for active-matrix 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) current-mode 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 LED driver automatically regulated supply voltage for the LED light bars without the need to calculate the output for different LED types. A FREQ2 pin is applied to adjust switching frequency in the range of 640kHz to 2MHz. It also integrates a 40V n-channel MOSFET that provides high output power. The 4-channel current driver is ideal for constant current driving, and, well matched less than 3%. To set the maximum driving current, the ISET pin is used to determine reference current. Each channel of the current drivers is set to 1300 times of this reference current. A PWM pin can be used to perform PWM dimming from the range of 100Hz to 20kHz. Open LED-string automatically disable the channel from entering over voltage protection. The low-dropout (LDO) linear regulator can supply up to 350mA current while input voltage is 3.3V. It uses an internal PMOS as the pass device. It is suitable for the supply voltage of the timing controller. 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. The VGH charge pump controller provides regulated TFT Gate-On voltage. The regulation of the positive charge pump is generated by the internal comparator that senses the output voltage and compares it with an internal reference.

   产品特点 返回TOPoMz嘉泰姆


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

„ Boost Regulator oMz嘉泰姆

Š 640kHz/1.2MHz Fixed Frequency oMz嘉泰姆

Š Current-Mode Control oMz嘉泰姆

Š Fast Transient Response to Pulse Load oMz嘉泰姆

Š ±1% Accurate Output Voltage oMz嘉泰姆

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

Š High Efficiency up to 90% oMz嘉泰姆

Š Programmable Soft-Start oMz嘉泰姆

Š Over-Current Protection oMz嘉泰姆

Š Output Under-Voltage Protection oMz嘉泰姆

„ White-LED Driver oMz嘉泰姆

Š Wide 4.2V to 24V Input Supply Range oMz嘉泰姆

Š Adjustable Switching Frequency oMz嘉泰姆

Š 40V/2A, 0.3Ω n-channel MOSFET oMz嘉泰姆

Š Input Under-Voltage Protection oMz嘉泰姆

Š Over Current Protection oMz嘉泰姆

Š Over Voltage Protection oMz嘉泰姆

Š Maximum Programmable LED Channel Current 50mA oMz嘉泰姆

Š Maximum 3% Matching between Channels oMz嘉泰姆

Š 100Hz~20kHz PWM Dimming oMz嘉泰姆

„ High-Performance Operational Amplifiers oMz嘉泰姆

Š ±150mA Output Short-Circuit Current oMz嘉泰姆

Š 12V/μs Slew Rate oMz嘉泰姆

Š 12MHz, -3dB Bandwidth oMz嘉泰姆

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

„ Low Dropout Voltage Linear Regulator oMz嘉泰姆

Š 350mA Maximum Output Current oMz嘉泰姆

Š Adjustable Output Voltage oMz嘉泰姆

„ On-Chip GPM Controller oMz嘉泰姆

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

Š Flicker Compensator oMz嘉泰姆

Š Power-On Sequence Control oMz嘉泰姆

„ Charge pump for VGH regulation oMz嘉泰姆

„ Low Voltage Detector oMz嘉泰姆

 Š Programmable Detecting Voltage and Delay Time oMz嘉泰姆

„ Thermal Protection oMz嘉泰姆

„ RoHs Compliant oMz嘉泰姆

„ TQFN5X5-40 and TQFN3.8X6.2-44 PackageoMz嘉泰姆

   应用范围 返回TOPoMz嘉泰姆


„ Notebook Computer Displays oMz嘉泰姆

„ UMPCs oMz嘉泰姆

„ LCD MonitoroMz嘉泰姆

   技术规格书(产品PDF) 返回TOP oMz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!oMz嘉泰姆

 QQ截图20160419174301.jpgoMz嘉泰姆

产品封装图 返回TOPoMz嘉泰姆


image.pngoMz嘉泰姆

电路原理图 返回TOPoMz嘉泰姆


aoMz嘉泰姆

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