CXLE8148输出变频升压步进转换器驱动白光LED背光恒流提供电池背光脉宽调制调光控制19V输出电压使能输入重复脉冲调节LED亮度

CXLE8148变频升压转换器驱动白色发光二极管目前在手机、掌上电脑和其他手持设备中提供背光。它允许白色LED串联的功能，以便LED电流一致亮度相同。使能输入可以重复脉冲调节LED亮度。快速的3MHz工作频率允许更小的电容器和感应器。故障状态保护采用逐周限流检测最大电感电流和过电压保护。0.2V低参考电压使电流感应电阻的功率损耗最小化。转换器可以工作从2V到6V，并能在4-LED上提供最大250mA的输出电流使用3V输入电压。从电源引出的静态电流低作为120uA。所有这些特性使CXLE8148适合于便携式设备，由一个电池供电
高达19V输出电压
宽工作范围：2V至6V
最大3MHz工作频率席
脉宽调制调光控制
关断电流<1uA
电流限制周期
低电流检测阈值：200mV
19V过输出电压保护

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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 The CXLE8148 variable frequency step-up Converter drives white LEDs with a constant 

current to provide backlight in cell phones, PDAs, and other hand-held devices. It 

features allowing series connection of the white LEDs so that the LED currents are 

identical for uniform brightness. An enable input can be pulsed repeatedly to adjust 

LEDs brightness. The fast 3MHz operation frequency allows for smaller capacitor and 

inductor. Fault condition protection uses cycle-by cycle current limiting to sense 

maximum inductor current and over-voltage protection. The 0.2V low reference voltage 

minimized the power loss across the current sense resistor. The converter can operate 

from 2V to 6V, and capable of delivering maximum 250mA output current at 4-LEDs 

application with 3V input voltage. Quiescent current drawn from power source is as low 

as 120uA. All of these features make CXLE8148 be suitable for the portable devices, 

which are supplied by a single battery. CXLE8148 is available in SOT23-6 package that is 

PB free. 

二.产品特点

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Up to 19V Output Voltage  

Wide Operation Range: 2V to 6V  

Maximum 3MHz Operating Frequency  

PWM Dimming Control  

Shutdown Current<1uA  

Current Limit Cycle-by-Cycle  

Low Current Sense Threshold: 200mV  

19V Over Output Voltage Protection  

Compact SOT23-6 Package

三.应用范围

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Compact Back Light Module  

Power Source for LED  

Constant Current Source    

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

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升压型LED背光/照明驱动电路(Step-up   White LED Driver )
Applications:   Step-up converter to drive white-LED, constant current output, LED backlight
Part No.	Mode	VIN	VOUT	IQ	FOSC	Eff.	FB Voltage	Package	Application
CXLE8147	PFM	0.8~9V		36uA	300kHz	82%	200mV	SOT89-5	Step-up Converter To Drive One Or Two 1W White LEDs
CXLE8148	PFM	2~6V	19V Max	93μA	3MHz	80%	200mV	SOT23-6	STBA,PHONE,PDA,GPS
CXLE8149	PWM	2.5~5.5V	28V Max	150μA	1.2MHz	90%	250mV	SOT23-6
CXLE8150	PWM	2.5~5.5V	30V Max	150μA	1.2MHz	96%	1.23V	SOT23-5