目录

1.产品概述       2.产品特点     a9D嘉泰姆

3.应用范围       4.技术规格书下载（PDF文档）a9D嘉泰姆

5.产品封装       6.电路原理图  a9D嘉泰姆

7.相关产品a9D嘉泰姆

   产品概述 返回TOPa9D嘉泰姆

     CXLE8173是一款专用于大尺寸LCD面板LED背光驱动器，其内部集成大功率/高效率升压转换器，同时提供4通道LED电流驱动电路。CXLE8173内置固定开关频率的电流模式升压控制器，此结构能在每个开关周期内都有效控制电感峰值电流。CXLE8173输入电压范围从4.5V~28V，其升压转换器开关频率可由外接电阻进行设定，此控制器驱动一个外接的功率管为LED背光提供驱动电压。利用外接电阻可设定CXLE8173 12CHs LED电流，同时12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。CXLE8173具有3uA关断电流，0.85V (ILED@60mA)反馈电压，单串LED可达18颗，最大65V输出电压将极大改善芯片效率，降低了功耗。CXLE8173支持PWM亮度调光模式，在PWM调光时，LED电流开启/关断的占空比和频率完全由PWMI端输入的PWM调光信号控制，且二者同步。CXLE8173内置多种保护功能，如LED开路、LED短路、输出过压、过温、输入过流，以及VCC欠压等，这些保护能有效的防止LED背光的失效。CXLE8173采用SOP-16封装。The CXLE8173 is a high power and high efficiency boost controller with 4-channel current sinker which is ideal for large LCD backlighting applications. CXLE8173 uses current mode, fixed frequency architecture which can clamp the inductor peak current each cycle. The switching frequency is programmable by an external frequency setting resistor. It drives an external MOSFET to boost up the output voltage from a 4.5V to 28V input supply. The CXLE8173regulates the current in each LED string to the programmed value set by an external current setting resistor. The CXLE8173current matching can achieve ±1.5% and regulation accuracy can reach ±2%. A 3μA shutdown current and 0.85V (ILED@180mA) feedback voltage and Maximum 65V output allows for up to 18 high-power LEDs in series will greatly improve efficiency and reduce power dissipation. The device supports pulse width modulation (PWM) brightness dimming. During digital PWM dimming, the WLED current is turned on/off at the duty cycle and frequency determined by the PWM signal on the PWMI pin. The CXLE8173integrated multiple protect functions, such as LED Open, LED Short, Output Over Voltage, Over thermal, Input Over Current, and Under Voltage Lockout (UVLO), these protection will prevent the LCD backlight from damage. CXLE8173is available in 16pin SOP packages.

   产品特点 返回TOPa9D嘉泰姆

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• 3uA关断电流a9D嘉泰姆

• 可驱动4串LED并联，单串可达18LEDsa9D嘉泰姆

• 支持外部PWM调光a9D嘉泰姆

• 高达65V输出电压a9D嘉泰姆

• 单串驱动电流可达180mAa9D嘉泰姆

• 宽输入电压范围：4.5V ~ 28Va9D嘉泰姆

• 通道之间电流匹配精度为±1.5%a9D嘉泰姆

• 外接电阻设置升压转换器频率a9D嘉泰姆

• 内置多种保护功能a9D嘉泰姆

-电流极限保护a9D嘉泰姆

-LED短路检测a9D嘉泰姆

-过温保护a9D嘉泰姆

-输出过压保护a9D嘉泰姆

• 关断模式下LED电流完全关断a9D嘉泰姆

• 集成UVLO/过热保护a9D嘉泰姆

• 最小0.5μs LED开启时间a9D嘉泰姆

• 热增强16引脚的SOP-16封装a9D嘉泰姆

• 符合RoHS指令，100%无铅封装a9D嘉泰姆

3μA shutdown currenta9D嘉泰姆

4 strings in parallel and up to 18 LEDs pera9D嘉泰姆

stringa9D嘉泰姆

External PWM Dimming Controla9D嘉泰姆

Output voltage up to 65Va9D嘉泰姆

Up to 180mA Drive Capability for Each Stringa9D嘉泰姆

Wide Input voltage range 4.5V to 28Va9D嘉泰姆

Better than 1.5% LED Current Regulationa9D嘉泰姆

Accuracy Between Stringsa9D嘉泰姆

Boost Switching frequency can be programmeda9D嘉泰姆

by external resistora9D嘉泰姆

Multiple Fault Protectionsa9D嘉泰姆

-Current Limit protectiona9D嘉泰姆

-Output Short circuit detectiona9D嘉泰姆

-Over-temperature protectiona9D嘉泰姆

-Output Over-voltage protectiona9D嘉泰姆

LED current turn off in shutdown modea9D嘉泰姆

Integrated UVLO/ Over Thermal protectiona9D嘉泰姆

Minimal 0.5μs LED On-Time regulationa9D嘉泰姆

Thermal Enhanced 16pin SOP-16 Packagea9D嘉泰姆

RoHS Compliant and 100% Lead (Pb)-Freea9D嘉泰姆

Halogen-Freea9D嘉泰姆

   应用范围 返回TOPa9D嘉泰姆

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• LCD监视器背光a9D嘉泰姆

• LCD-电视背光
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LCD Monitor LED Backlighting
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LCD-TV LED Backlightinga9D嘉泰姆

   技术规格书（产品PDF) 返回TOP a9D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！a9D嘉泰姆

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产品封装图 返回TOPa9D嘉泰姆

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电路原理图 返回TOPa9D嘉泰姆

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