4路大电流白光LED升压驱动芯片CXLE8173用于大尺寸LCD面板LED背光驱动器内部集成大功率高效率升压转换器提供4通道LED电流驱动电路PWM亮度调光模式

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。

目录

1.产品概述       2.产品特点     

3.应用范围       4.技术规格书下载（PDF文档）

5.产品封装       6.电路原理图  

7.相关产品

   产品概述 返回TOP

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     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TOP

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• 3uA关断电流

• 可驱动4串LED并联，单串可达18LEDs

• 支持外部PWM调光

• 高达65V输出电压

• 单串驱动电流可达180mA

• 宽输入电压范围：4.5V ~ 28V

• 通道之间电流匹配精度为±1.5%

• 外接电阻设置升压转换器频率

• 内置多种保护功能

-电流极限保护

-LED短路检测

-过温保护

-输出过压保护

• 关断模式下LED电流完全关断

• 集成UVLO/过热保护

• 最小0.5μs LED开启时间

• 热增强16引脚的SOP-16封装

• 符合RoHS指令，100%无铅封装

3μA shutdown current

4 strings in parallel and up to 18 LEDs per

string

External PWM Dimming Control

Output voltage up to 65V

Up to 180mA Drive Capability for Each String

Wide Input voltage range 4.5V to 28V

Better than 1.5% LED Current Regulation

Accuracy Between Strings

Boost Switching frequency can be programmed

by external resistor

Multiple Fault Protections

-Current Limit protection

-Output Short circuit detection

-Over-temperature protection

-Output Over-voltage protection

LED current turn off in shutdown mode

Integrated UVLO/ Over Thermal protection

Minimal 0.5μs LED On-Time regulation

Thermal Enhanced 16pin SOP-16 Package

RoHS Compliant and 100% Lead (Pb)-Free

Halogen-Free

   应用范围 返回TOP

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• LCD监视器背光

• LCD-电视背光
 

LCD Monitor LED Backlighting
 

LCD-TV LED Backlighting

   技术规格书（产品PDF) 返回TOP 

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产品封装图 返回TOP

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电路原理图 返回TOP

 

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白光LED驅動器   > LED背光
Part   Number	remark	Vin (V)	Vout  (max)(V)	FB(V)	IQ(mA)	Isw(A)	Max LED	Peak  Efficency  (%)	Package
CXLE8167	Small Package, High Performance, Asynchronies Boost for WLED Driver	2.6~5.5	18	0.2	0.4	2	15P3S	93	TSOT23-5
CXLE8168	White LED Driver For Buck-Boost Application	6~25	32	Vctrl/10	1.3	1.4	3 x 9 = 27	90	TDFN-8
CXLE8169	White LED Boost Converter with PWM Dimming and Single-Wire Interface	2.7~5.5	38	0.2	0.35	1.3	12	91	TDFN-6
CXLE8170	10 White LED Boost Converter with PWM Dimming and Single-Wire Series   Interface	2.5 ~ 5.5	38.5	0.2/0.3	0.3	1.3	12	88	TSOT23-6,SOT23-6
CXLE8171	10 White LED Boost Converter with PWM Dimming	2.5~5.5	38.5	0.2	0.3	1.3	12	88	TSOT23-6
CXLE8172	6 String White LED Driver with Boost Converter	2.5~24	43	0.5	2	2.5	6 × 10= 60	90	TQFN-20
CXLE8173	4 Strings High Current White LED Driver with Boost Controller	4.5~28	65	0.6	0.75	-	4 x 18 =72	93	SOP-16
CXLE8174	12 String White LED Driver With Boost Controller	4.5~28	65	0.6	1.5	-	216	93	TSSOP-28(EP)