CXLC8986CXLC8987包括高性能升压稳压器、6通道LED驱动器、低损耗线性稳压器（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VGL线性稳压器。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（1.2兆赫）电流模式稳压器，集成了20伏N通道0.2ΩMOSFET，允许使用超小电感和陶瓷电容。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15V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。它还集成了一个提供高输出功率的40V n沟道MOSFET。6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800倍。可以使用一个PWM管脚在100Hz到25kHz的范围内进行PWM调光。CXLC8986 CXLC8987中的模式管脚用于设置调光模式。如果模式引脚设置为VCC或浮动，则调光模式为PWM模式，则当前驱动器的开/关与PWMB信号同步。如果模式引脚设置为GND，则当PWMB占空比≥25%时，PWMB和ILED电流设置为PWMB占空比乘以ISET电流。如果PWMB占空比小于25%，则ILED电流固定在0.25xISET，调光占空比为4xpwmb。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。它适用于定时控制器的电源电压。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。它还可以通过内部定时器（60ms）在通电时延迟栅极接通电压，以实现栅极驱动器ic的校正通电顺序。栅极导通电压下降时间可由外部电容器和电阻器编程。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（200mA）、快速转换速率（12V/μs）、宽带宽（12MHz）和轨对轨输入/输出。栅极关断线性调节器控制器使用连接到开关节点的外部电荷泵提供经调节的TFT栅极关断电源。在产生负电压后使用门极低调节器可以调节过电压。
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[ CXLC8986 ]
目录
7.相关产品
产品概述 返回TOP
The CXLC8986 CXLC8987 includes a high-performance boost regulator, 6-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 VGL linear regulator 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 (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 15V 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. It also integrates a 40V n-channel MOSFET that provides high output power. The 6-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 800 times of this reference current. A PWM pin can be used to perform PWM dimming from the range of 100Hz to 25kHz. The MODE pin in CXLC8986 CXLC8987 is used to set the dimming mode. If MODE pin set to VCC or floating, the dimming mode is in the PWM mode, the current driver ON/OFF is synchronized with the PWMB signal. If Mode pin set to GND, PWMB and ILED current is set at PWMB duty multiplied by ISET current when PWMB duty ≥ 25%. If the PWMB duty<25%, the ILED current is fixed at 0.25xISET, and the dimming duty is 4 x PWMB duty. 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 by the internal timer (60ms) while power-on for achieving a corrected power-on sequence for gate driver ICs. The falling time of the Gate-On voltage is 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 (200mA), fast slew rate (12V/μs), wide bandwidth (12MHz) and rail-to-rail input/output. The gate-off linear regulator controller provides regulated TFT gate-off supplies using external charge pump attached to the switching node. Using the gate-low regulator after the produced negative voltage can regulate the exceeded voltage.
产品特点 返回TOP
„ 2.5V to 5.5V Input Supply Range
„ Boost Regulator
Š 1.2MHz Fixed Frequency
Š Current-Mode Control
Š Fast Transient Response to Pulse Load
Š ±1% Accurate Output Voltage
Š Built-In 20V/2A, 0.2Ω N-Channel MOSFET
Š High Efficiency up to 90%
Š Programmable Soft-Start
Š Over-Current Protection
Š Output Under-Voltage Protection
„ White-LED Driver
Š Wide 4.2V to 24V Input Supply Range
Š 1.2MHz Fixed Frequency
Š High Efficiency up to 90%
Š 40V/2A, 0.2Ω n-channel MOSFET
Š Input Under-Voltage Protection
Š Over Current Protection
Š Over Voltage Protection
Š Maximum Programmable LED Channel Current 30mA
Š Current accuracy ±3% and current balance ±2%
Š 100Hz~25kHz PWM Dimming
Š Mixed mode and PWM Dimming method
„ High-Performance Operational Amplifiers
Š ±200mA Output Short-Circuit Current
Š 12V/μs Slew Rate
Š 12MHz, -3dB Bandwidth
Š Rail-to-Rail Input and Output
„ Low Dropout Voltage Linear Regulator
Š 350mA Maximum Output Current
Š Adjustable Output Voltage
„ On-Chip GPM Controller
Š Flicker Compensator
Š Power-On Sequence Control
„ Linear Regulator Controller for VGL
„ Low Voltage Detector
Š Programmable Detecting Voltage and Delay Time
„ Thermal Protection
„ RoHs Compliant
„ TQFN5X5-40 Package
应用范围 返回TOP
„ Notebook Computer Displays
„ UMPCs
„ LCD Monitor
技术规格书（产品PDF) 返回TOP
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产品封装图 返回TOP
电路原理图 返回TOP
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Integrated PMIC for LCD |
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Part NO. |
Vin(V) min. |
Vin(V) max. |
FSW (kHz) |
ILX (A) |
VLX (V) |
OPAS/ R(V/μs |
OPAI SCmA |
Note |
Package |
|
2.5 |
5.5 |
1200 |
3 |
18 |
40 |
200 |
Async-Boost,VGH/VGL Charge-Pump, VCOM,GPM, Voltage Detector |
TQFN4X4-24 |
|
|
2.5 |
5.5 |
1200 |
1.8 |
20 |
12 |
150 |
Async-Boost, VCOM,VGH/VGL Charge-Pump, 1-CH WLED Driver with EN,LXB=20V/1.2A |
TQFN4X4-24 |
|
|
2.5 |
5.5 |
1200 |
2 |
20 |
12 |
200 |
Async-Boost,VGL Regulator,LDO,GPM,OPA, Voltage Detector,6-CH WLED Driver,30mA/CH |
TQFN5X5-40 |
|
|
2.5 |
5.5 |
600 |
2 |
20 |
12 |
200 |
Async-Boost,VGL Regulator,LDO,GPM,OPA, Voltage Detector,6-CH WLED Driver,30mA/CH |
TQFN5X5-40 |
|
|
2.6 |
5.5 |
600/ 1200 |
3 |
20 |
20 |
200 |
Async-Boost,VGH Regulator,OPA*3,Buck-Boost VGL Temp. Compensation,7-CH-33V~+33V Level-Shifter |
TQFN6X6-48 |
|
|
2.6 |
5.5 |
600/ 1200 |
-- |
-- |
20 |
200 |
Async-Boost,VGH Regulator,OPA*3,Buck-Boost VGL Temp. Compensation,7-CH-33V~+33V Level-Shifter |
QFN6X6-48 |
|
|
2.6 |
5.5 |
600/ 1200 |
3 |
20 |
20 |
200 |
Async-Boost,VGH Regulator,OPA*3,Buck -Boost VGL with Temp. Compensation |
QFN5X5-32 |
|
|
8 |
14 |
750 |
5 |
24 |
30 |
200 |
Async-Boost,Async-Buck, OPA,VGON and VGOFF Regulator,GPM,VGH Temp. Compensation,I2C |
TQFN6X6-40 |
|
|
2.5 |
5.5 |
1200 |
4.5 |
18 |
-- |
-- |
Async-Boost, VGHM,VGH/VGOFF Charge-Pump |
TQFN5X5-20 |
|
|
2.5 |
5.5 |
1200 |
3 |
18 |
40 |
200 |
Async-Boost,VGH/VGL Charge-Pump, VCOM, GPM,Voltage Detector |
TQFN4X4-24 |
|
|
2.5 |
5.5 |
1200 |
1.8 |
20 |
12 |
150 |
Async-Boost,VGH/VGL Charge-ump,VCOM, |
TQFN3X3-16 |
|
|
2.5 |
5.5 |
1200 |
1.8 |
20 |
12 |
150 |
Async-Boost,VGH/VGL Charge-Pump,VCOM, |
TQFN3X3-16 |
|
|
2.5 |
5.5 |
640/ 1200 |
2 |
20 |
12 |
150 |
Async-Boost, VGH Charge-Pump,VCOM, GPM, Voltage Detector,LDO |
TQFN4X4-24 |
|
|
2.5 |
5.5 |
640/ 1200 |
2 |
20 |
12 |
150 |
Async-Boost,VGH Charge-Pump,VCOM,LDO,GPM, Voltage Detector,4-CH WLED Driver,50mA/CH |
TQFN5X5-40 TQFN3.8X6.2 |
|
|
2.5 |
5.5 |
640/ 1200 |
2 |
20 |
12 |
150 |
Async-Boost,VGH Charge-Pump,VCOM, GPM, Voltage Detector |
TQFN4X4-24 |
|
|
2.5 |
5.5 |
1200 |
1.8 |
20 |
12 |
150 |
Async-Boost,VGH Charge-Pump,VGL Charge-Pump, Voltage Detector,1-CH WLEDdriver,240mA/CH,HVInput |
TQFN4X4-24 |
|
|
8 |
14 |
500/ 750 |
2.3 |
19 |
-- |
-- |
Async-Boost,Async-Buck,VGH/VGL,Charge-Pump |
TSSOP-28(FD) |
|
|
8 |
14 |
500/ 750 |
3 |
20 |
45 |
200 |
Async-Boost,Async-Buck, VGH/VGL Charge-Pump, GPM,VCOM,Voltage Detector,HV LDO |
TQFN7X7-48 |
|
|
9.5 |
14 |
500~ 2000 |
3.5 |
20 |
-- |
-- |
Async-Boost,Async-Buck,VGON and VGOFF Regulator |
TQFN5X5-28 |
|
|
8 |
14 |
750/ 1000 |
5 |
24 |
-- |
-- |
Async-Boost,Sync-Buck*2,Async-Buck,VGON and VGOFF Regulator,GPM,VGH Temp.Compensation,I2C |
TQFN6X6-40 |
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◀ 上一篇:CXLC8985高性能升压调节器VCOM缓冲器VGH电荷泵驱动器VGL电荷泵驱动器和用于有源矩阵薄膜晶体管TFT液晶显示器LCD的白色LED驱动器boost转换器为面板源驱动器ic提供稳压电源
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