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1.产品概述       2.产品特点     t6e嘉泰姆

3.应用范围       4.技术规格书下载（PDF文档）t6e嘉泰姆

5.产品封装       6.电路原理图  t6e嘉泰姆

7.相关产品t6e嘉泰姆

   产品概述 返回TOPt6e嘉泰姆

      CXLE8172是一款用于中等尺寸LCD面板的LED背光驱动器，其内部集成了高效率升压转换器，同时提供6通道LED电流驱动电路。CXLE8172内置峰值电流2.5A/43V的MOSFET，采用电流模式架构，可同时驱动每路10个LED，共6路LED。升压转换器开关频率可由外接电阻进行设定。利用外接电阻可设定CXLE8172 6个通道LED电流，同时6通道间LED电流匹配达±1.5%，每一通道LED电流精度高达±2%，此性能保证了LED背光亮度的均一性与精确性。为了保证LED驱动电路的正常工作，升压转换器会采样6通道中最小的反馈电压来产生合适的输出电压。CXLE8172具有2.5V～24V宽的输入电压范围，可提供5mA～50mA的LED电流，还有峰值电流限制功能。采用PWM和模拟混合调光模式实现LED电流的精确控制。CXLE8172内置多种保护功能，如LED开路/短路、输出过压、过温关断和欠压保护，这些保护能有效的防止LCD背光的失效和损坏。CXLE8172采用20引脚3mm×3mm 的TQFN封装。The CXLE8172 is a high efficiency boost regulator with 6 channel current sinker which is ideal for media size LCD backlighting applications. The device with integrated 2.5A/43V power MOSFET uses current mode architecture and drives six strings in parallel and supports up to 10 pieces of LEDs per string. The switching frequency is programmable by an external frequency setting resistor. The CXLE8172 regulates the current in each LED string to the programmed value set by an external current setting resistor. The CXLE8172 current matching can achieve ±2%. To provide enough headroom for the operating of current sink, boost converter monitors the minimum voltage of feedback pins and regulates an optimized output voltage for power efficiency. The CXLE8172has wide input voltage range from 2.5V to 24V and provides adjustable 5mA to 50mA LED current. It provides cycle-by-cycle over current protection. The device supports PWM and analog brightness dimming functions for accurate LED current control. The CXLE8172integrated multiple protect functions, such as LED open, LED short, output over voltage, over thermal and under voltage lockout, these protections will prevent the LCD backlight from damage. The CXLE8172is available in a 3×3mm TQFN-20L package.

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‧输入电压范围：2.5-24Vt6e嘉泰姆

‧可同时驱动6路每路10个WLEDt6e嘉泰姆

‧集成2.5A/43V MOSFETt6e嘉泰姆

‧输出电压可达43Vt6e嘉泰姆

‧外部可调5mA~50mA LED电流t6e嘉泰姆

‧PWM 调光频率可达20kHzt6e嘉泰姆

‧PWM 转模拟调光模式调光频率可达20kHz，具有8位分辨率的精度t6e嘉泰姆

‧每路LED之间2%的精度t6e嘉泰姆

‧多种故障保护t6e嘉泰姆

- 过流保护t6e嘉泰姆

- 过压保护t6e嘉泰姆

- 过温保护t6e嘉泰姆

- LED开路/短路保护t6e嘉泰姆

‧3mm×3mm TQFN-20封装t6e嘉泰姆

‧符合RoHS规范及Pb-Free Halogen-Freet6e嘉泰姆

2.5V to 24 V Input Voltaget6e嘉泰姆

6 Strings in Parallel and Up to 10 WLEDs Pert6e嘉泰姆

Stringt6e嘉泰姆

Integrated 2.5A 43V MOSFETt6e嘉泰姆

Output Voltage Up to 43Vt6e嘉泰姆

Programmable Full Channel Current from 5mA to 50mAt6e嘉泰姆

Direct PWM Dimming up to 20kHzt6e嘉泰姆

PWM to Analog Dimming up to 20kHz with 8 bit resolutiont6e嘉泰姆

Better Than 2% Current Regulation Accuracyt6e嘉泰姆

Between Stringst6e嘉泰姆

Multiple Fault Protectionst6e嘉泰姆

-Current Limit Protectiont6e嘉泰姆

-Over Voltage Protectiont6e嘉泰姆

-Over Temperature Protectiont6e嘉泰姆

-WLED Open/Short Protectiont6e嘉泰姆

Available in 3mm×3mm TQFN-20 Packaget6e嘉泰姆

RoHS Compliant and 100% Lead (Pb)-Freet6e嘉泰姆

Halogen-Freet6e嘉泰姆

   应用范围 返回TOPt6e嘉泰姆

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‧笔记本LCD背光显示t6e嘉泰姆

‧个人电脑LCD背光显示t6e嘉泰姆

Notebook LCD Display Backlightt6e嘉泰姆

UMPC LCD Display Backlightt6e嘉泰姆

   技术规格书（产品PDF) 返回TOP t6e嘉泰姆

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◀ Previous:The CXLE8171 is a constant current step-up converter specifically designed to drive white LEDs. With a 45V rated integrated switch FET, the step-up converter supports up to 10 white LEDs

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Next▶:The CXLE8173 is a high power and high efficiency boost controller with 4-channel current sinker which is ideal for large LCD backlighting applications.