目录

1.产品概述       2.产品特点     ar7嘉泰姆

3.应用范围       4.技术规格书下载（PDF文档）ar7嘉泰姆

5.产品封装       6.电路原理图  ar7嘉泰姆

7.相关产品ar7嘉泰姆

   产品概述 返回TOPar7嘉泰姆

     CXLE8174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12通道LED电流驱动电路。CXLE8174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。CXLE8174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CXLE8174 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。CXLE8174具有3uA关断电流，1.0V (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。CXLE8174支持外部PWM调光模式与DC电压调光模式。在PWM调光模式下，PWM调光信号由PWMI引脚输入，此信号直接控制LED的开启与关断；在DC电压调光模式，由BOSC到地之间的电容来控制LED调光频率。CXLE8174集成了多种保护功能，如：LED开路、LED短路、输出过压、过温、过流以及欠压保护，这些功能将有效的保证LCD背光的可靠性。The CXLE8174 is a high power and high efficiency boost controller with 12-channel current sinker which is ideal for large LCD backlighting applications. CXLE8174 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 CXLE8174regulates the current in each LED string to the programmed value set by an external current setting resistor. The ECXLE8174current matching can achieve ±1.5% and regulation accuracy can reach ±2%. A 3μA shutdown current and 1.0V (ILED@60mA) 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 and DC voltage 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. In DC voltage dimming, LEDs current turn ON/OFF frequency programmed by the capacitor from BOSC to GND. The CXLE8174integrated 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.

   产品特点 返回TOPar7嘉泰姆

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• 3uA关断电流ar7嘉泰姆

• 可驱动12串LED并联，单串可达18LEDsar7嘉泰姆

• 支持外部PWM和DC调光ar7嘉泰姆

• 高达65V输出电压ar7嘉泰姆

• 宽输入电压范围：4.5V ~ 28Var7嘉泰姆

• 通道之间电流匹配精度为±1.5%ar7嘉泰姆

• 外接电阻设置升压转换器频率ar7嘉泰姆

• 内置多种保护功能ar7嘉泰姆

-电流极限保护ar7嘉泰姆

-LED短路检测ar7嘉泰姆

-过温保护ar7嘉泰姆

-输出过压保护ar7嘉泰姆

• 关断模式下LED电流完全关断ar7嘉泰姆

• 集成UVLO/过热保护ar7嘉泰姆

• 最小0.5μs LED开启时间ar7嘉泰姆

• 热增强28引脚的TSSOP28封装ar7嘉泰姆

• 符合RoHS指令，100%无铅封装ar7嘉泰姆

 3μA shutdown currentar7嘉泰姆

 12 strings in parallel and up to 18 LEDs perstringar7嘉泰姆

External PWM or DC Voltage Dimmingar7嘉泰姆

Controlar7嘉泰姆

 Output voltage up to 65Var7嘉泰姆

 Wide Input voltage range 4.5V to 28Var7嘉泰姆

Better than 1.5% LED Current Regulationar7嘉泰姆

Accuracy Between Stringsar7嘉泰姆

Boost Switching frequency can be programmed by external resistorar7嘉泰姆

 Multiple Fault Protectionsar7嘉泰姆

-Current Limit protectionar7嘉泰姆

-Output Short circuit detectionar7嘉泰姆

-Over-temperature protectionar7嘉泰姆

-Output Over-voltage protectionar7嘉泰姆

 LED current turn off in shutdown modear7嘉泰姆

 Integrated UVLO/ Over Thermal protectionar7嘉泰姆

 Minimal 0.5μs LED On-Time regulationar7嘉泰姆

 Thermal Enhanced 28pin TSSOP28 Packagear7嘉泰姆

 RoHS Compliant and 100% Lead (Pb)-Free Halogen-Freear7嘉泰姆

   应用范围 返回TOPar7嘉泰姆

• LCD监视器背光ar7嘉泰姆

• LCD-电视背光ar7嘉泰姆

 LCD Monitor LED Backlightingar7嘉泰姆

 LCD-TV LED Backlightingar7嘉泰姆

   技术规格书（产品PDF) 返回TOP ar7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！ar7嘉泰姆

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产品封装图 返回TOPar7嘉泰姆

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电路原理图 返回TOPar7嘉泰姆

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