CXLE814背光驱动40伏额定集成功率开关MOSFET升压转换器串联驱动多达10个白色LED PWM亮度控制调光占空比从0.3%到100%内置软启动和过电流限制

CXLE8144具有40伏额定集成功率开关MOSFET，是一个升压转换器，可串联驱动多达10个白色LED。CXLE8144在600kHz固定开关频率下工作，以减少输出纹波，提高转换效率，并允许使用小型外部组件。
默认满标度白色LED电流由外部传感器电阻设置，反馈电压可调为200毫伏，如典型应用所示。在工作过程中，可以使用施加在EN引脚上的脉冲宽度调制（PWM）信号来控制LED电流，通过该信号，PWM占空比确定反馈参考电压，然后确定白色LED电流。在脉宽调制模式下，WD3148不会使LED电流爆裂；因此，它不会在陶瓷输出电容器上产生可听的噪音。为了最大限度地保护，该器件具有集成的开放式LED保护，禁用CXL8144，以防止输出电压超过绝对的最大额定值在开放的LED条件。
CXLE8144有一个节省PCB空间的DFN 2毫米x 2毫米-6L封装，带有底部热垫。标准产品无铅无卤。
2.7V~5.5V输入电压范围
•38V开路LED保护
200mV参考电压
•600kHz开关频率
•效率高达91%
PWM亮度控制
PWM调光占空比从0.3%到100%
内置软启动和过电流限制

                          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

一.产品概述

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    With a 40-V rated integrated power switch MOSFET, the CXLE8144 is a boost converter that drives up to 10 White LEDs in series. The CXLE8144 operates at 600kHz fixed switching frequency to reduce output ripple, improve conversion efficiency, and allows for the use of small external components. 

    The default Full-Scale White LED current is set by an external sensor resistor with regulated 200mV feedback voltage, as shown in typical application. During operation, the LED current can be controlled using the Pulse Width Modulation (PWM) signal applied on the EN pin, through which the PWM Duty-Cycle determines the feedback reference voltage and then the White LED current. In PWM mode, the WD3148 does not burst the LED current; therefore, it does not generate audible noises on the ceramic output capacitor. For maximum protection, the device features integrated open LED protection that disables the CXLE8144 to prevent the output voltage from exceeding the absolute maximum ratings during open LED conditions. 

    The CXLE8144 is available in a PCB space saving DFN 2mm x 2mm-6L Package with bottom thermal pad. Standard product is Pb-free and Halogen-free.  

二.产品特点

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  2.7V~5.5V Input voltage range

  38V Open LED Protection

  200mV Reference Voltage

  600kHz Switching frequency

  Up to 91% Efficiency

  PWM Brightness Control

  PWM Dimming Duty ranges from 0.3% to 100%

  Built-in Soft-Start and Over-Current limit

三.应用范围

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  Smart Phones

  Tablets

  Portable games    

四.技术规格书（产品PDF)

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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！

 

五.产品封装图

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六.电路原理图

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七.相关芯片选择指南   更多同类产品......

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LV Product>LED Backlight
Product	Character	Typical   Effciency	Operating   Voltage	Quiescent   Iq	Output   Voltage	Iq in Shutdown	SW   Current Limit	Package
CXLE8135	1MHz Asynchronous   PWM	88%	2.5~5.5V	400μA	UP to 20V	1μA	1A	SOT23-5L
CXLE8136	1MHz OVP   Asynchronous PWM	88%	2.5~6V	550μA	Up to 25V	1μA	1A	SOT23-6L
CXLE8137	1MHz OVP   Asynchronous PWM	92%	2.5～5.5V	400μA	Up to 36V	1μA	1.2A	SOT23-6L
CXLE8138	1MHz OVP   Asynchronous PWM	92%	2.5～5.5V	400μA	Up to 36V	1μA	1.2A	SOT23-6L   DFN22-8L
CXLE8139	1MHz OVP   Asynchronous PWM	92%	2.5~5.5V	400μA	Up to 36V	1μA	2A	TSOT23-6L   DFN22-8

背光驱动
Product	VIN	VIN	VOVP	VFB	IQ	ILIM	R(ON)	Freq.	Efficiency	Package
	Min	Max	Typ	Typ	Typ	Min	Typ	Typ	Max
	(V)	(V)	(V)	(mV)	(uA)	(A)	(Ω)	(MHz)	(%)
CXLE8140	3	5.5	38	0.2	300	1.5	0.3	0.6	91	SOT-23-6L
CXLE8141	3	5.5	26	0.2	300	1.5	0.3	1	91	SOT-23-6L
CXLE8142	2.7	5.5	38	0.2	400	0.8	0.6	0.6	91	DFN2020-6L
CXLE8143	2.7	5.5	38	0.2	200	1.2	0.45	1	92	TSOT-23-6L
CXLE8144	2.7	5.5	38	0.2	400	0.85	0.4	1.5	91	DFN2*2-6L