产品概述 返回TOPev2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TOPev2嘉泰姆
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• 3uA关断电流ev2嘉泰姆
• 可驱动12串LED并联，单串可达18LEDsev2嘉泰姆
• 支持外部PWM和DC调光ev2嘉泰姆
• 高达65V输出电压ev2嘉泰姆
• 宽输入电压范围：4.5V ~ 28Vev2嘉泰姆
• 通道之间电流匹配精度为±1.5%ev2嘉泰姆
• 外接电阻设置升压转换器频率</p>
• 内置多种保护功能ev2嘉泰姆
-电流极限保护ev2嘉泰姆
-LED短路检测</p>
-过温保护ev2嘉泰姆
-输出过压保护ev2嘉泰姆
• 关断模式下LED电流完全关断ev2嘉泰姆
• 集成UVLO/过热保护ev2嘉泰姆
• 最小0.5μs LED开启时间</p>
• 热增强28引脚的TSSOP28封装ev2嘉泰姆
• 符合RoHS指令，100%无铅封装ev2嘉泰姆
3μA shutdown currentev2嘉泰姆
12 strings in parallel and up to 18 LEDs perev2嘉泰姆
stringev2嘉泰姆
External PWM or DC Voltage Dimmingev2嘉泰姆
Controlev2嘉泰姆
Output voltage up to 65Vev2嘉泰姆
Wide Input voltage range 4.5V to 28Vev2嘉泰姆
Better than 1.5% LED Current Regulationev2嘉泰姆
Accuracy Between Stringsev2嘉泰姆
Boost Switching frequency can be programmedev2嘉泰姆
by external resistorev2嘉泰姆
Multiple Fault Protectionsev2嘉泰姆
-Current Limit protectionev2嘉泰姆
-Output Short circuit detectionev2嘉泰姆
-Over-temperature protectionev2嘉泰姆
-Output Over-voltage protectionev2嘉泰姆
LED current turn off in shutdown modeev2嘉泰姆
Integrated UVLO/ Over Thermal protectionev2嘉泰姆
Minimal 0.5μs LED On-Time regulationev2嘉泰姆
Thermal Enhanced 28pin TSSOP28 Packageev2嘉泰姆
RoHS Compliant and 100% Lead (Pb)-Freeev2嘉泰姆
Halogen-Freeev2嘉泰姆
应用范围 返回TOPev2嘉泰姆
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• LCD监视器背光</p>
• LCD-电视背光ev2嘉泰姆
LCD Monitor LED Backlightingev2嘉泰姆
LCD-TV LED Backlightingev2嘉泰姆
技术规格书（产品PDF) 返回TOP ev2嘉泰姆
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