内部集成电荷泵，运算放大器和高压开关 用于TFT-LCD的DC-DC转换器TFT LCD DC-DC Converter with Integrated Charge Pumps, OP-AMP and HV-Switch CXLC8959是一款用于监视器或笔记本TFT-LCD面板供电的专用芯片，其直流输入电压范围为：2.5V-5.5V。该芯片内部集成了升压转换器，正、负电荷泵，快速VCOM 缓冲

   产品概述 返回TOPQN8嘉泰姆

      CXLC8959是一款用于监视器或笔记本TFT-LCD面板供电的专用芯片，其直流输入电压范围为：2.5V-5.5V。该芯片内部集成了升压转换器，正、负电荷泵，快速VCOM 缓冲器和高压开关四个部分。升压转换器内置了功率开关管，其峰值电流高达3.5A；采用固定频率峰值电流模控制技术，并结合外部频率补偿功能使其具有快速负载响应特性和易于补偿的优点；采用1.2MHz高速开关频率，极大的减小了电感、电容的取值，为节约PCB面积和成本提供了有利条件；同时，还提供了欠压保护、过压保护、过流保护、过温保护等功能，确保芯片安全可靠的工作。正、负电荷泵可根据用户需求，灵活调整倍压系数以产生正、负两路供电电源，给TFT-LCD的栅驱动器芯片供电。高速VCOM 缓冲器特性主要有：500mA的短路电流，20MHz 带宽，45V/μs压摆率和轨对轨的输入、输出电压范围。高压开关控制电路可调整栅极驱动电压斜率，保证了TFT的栅极驱动电压，从而改善画面质量。CXLC8959采用24引脚TQFN封装，封装的面积是4mm× 4mm。工作温度范围 -40oC 到 +85oC。The CXLC8959 generates power supply rails for thin-film transistor (TFT) liquid-crystal display (LCD) panels in monitors and notebooks operated from 2.5V to 5.5V input supply. The device integrates a step-up converter, positive and negative charge pumps, a high speed VCOM buffer and a HV-Switch. The external compensated step-up converter features an internal power MOSFET and high frequency operation allowing to use small inductors and capacitors. The step up converter uses fixed-frequency peak current mode control architecture which provides fast load-transient response and easy compensation. A 3.5A peak current limit for the internal switch protects power supply fault condition. The regulated positive and negative charge pump regulators generate the positive and negative supply rails for the TFT LCD gate resistive voltage-divider ICs. The high speed VCOM buffer features 500mA short circuit current, 20MHz bandwidth, fast slew rate 45V/μs, and rail-to-rail inputs and outputs. The HV-Switch circuit control provides the ability to control the slope for the gate drive voltage. It shapes the TFT gate high voltage to improve image quality. The CXLC8959 is available in a small (4mm× 4mm) 24 pin TQFN package and operates over the -40oC to +85oC temperature range.

   产品特点 返回TOPQN8嘉泰姆

QN8嘉泰姆

• 输入电压范围：2.5V-5.5VQN8嘉泰姆

• 1.2MHz 电流模升压转换器QN8嘉泰姆

- 内置 20V, 3.5A, 0.16Ω. N-MOSFETQN8嘉泰姆

- 效率高达 90%QN8嘉泰姆

- 内部数字软启动</p>

- 快速负载瞬态响应</p>

- 过温保护QN8嘉泰姆

• 输出电压可调的电荷泵为TFT栅极提供导通电压</p>

• 输出电压可调的电荷泵为TFT栅极提供关断电压QN8嘉泰姆

• 高速大电流18V VCOM 缓冲器</p>

- 带宽20MHzQN8嘉泰姆

- 压摆率45V/μSQN8嘉泰姆

- 最小500mA的输出峰值电流</p>

• 高压开关电路</p>

- 下降斜率可调QN8嘉泰姆

- 减小面板与栅极走线间的耦合效应QN8嘉泰姆

- 闪烁补偿电路QN8嘉泰姆

• 输入欠压锁存和过温保护</p>

• 24脚 4mm×4mm TQFN 封装QN8嘉泰姆

• 符合RoHS规范及Pb-Free Halogen-FreeQN8嘉泰姆

􀁺 2.5V to 5.5V Input Supply RangeQN8嘉泰姆

􀁺 1.2MHz Current Mode Step Up ConverterQN8嘉泰姆

- Built-In 20V, 3.5A, 0.16Ω N-MOSFETQN8嘉泰姆

- High Efficiency Up to 90%QN8嘉泰姆

- Internal digital Soft-StartQN8嘉泰姆

- Fast Transient Response to Pulsed LoadQN8嘉泰姆

- Over-Temperature ProtectionQN8嘉泰姆

􀁺 Regulated Charge pump for TFT gate-on SupplyQN8嘉泰姆

􀁺 Regulated Charge pump for TFT gate-off SupplyQN8嘉泰姆

􀁺 High Speed High Current 18V VCOM BufferQN8嘉泰姆

- 20MHz BWQN8嘉泰姆

- 45V/μS Slew RateQN8嘉泰姆

- More than 500mA Peak Output CurrentQN8嘉泰姆

􀁺 HV-Switch CircuitQN8嘉泰姆

- Adjustable Falling rateQN8嘉泰姆

- Reduction of Coupling Effect between Gate LineQN8嘉泰姆

and PixelQN8嘉泰姆

- Flicker Compensation CircuitQN8嘉泰姆

􀁺 Input Under Voltage Lockout and Thermal ProtectionQN8嘉泰姆

􀁺 24 pin 4mm×4mm TQFN PackageQN8嘉泰姆

􀁺 RoHS Compliant and 100% Lead (Pb)-FreeQN8嘉泰姆

Halogen-FreeQN8嘉泰姆

   应用范围 返回TOPQN8嘉泰姆

QN8嘉泰姆

• LCD 监视器</p>

• 笔记本显示器QN8嘉泰姆

• 液晶电视QN8嘉泰姆

􀁺 LCD MonitorsQN8嘉泰姆

􀁺 Notebook DisplayQN8嘉泰姆

􀁺 LCD TVsQN8嘉泰姆

   技术规格书（产品PDF) 返回TOP QN8嘉泰姆

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