CXAC85182升压转换器驱动多达8个系列的白色LED背光应用电流模式1.2兆赫固定频率调节LED电流1.9A开关电流限制电流限制和热关机保护

CXAC85182是一个升压转换器，设计用于驱动多达8个系列的白色LED用于背光应用。CXAC85182采用电流模式，1.2兆赫固定频率结构来调节LED电流，该电流通过外部电流感测电阻器设置。它的低300毫伏反馈电压降低了功率损耗，提高了效率。如果由于开路而出现过电压情况，则OV引脚监测输出电压并关闭转换器。CXAC85182包括欠压锁定、限流和热关机保护，防止输出过载时损坏。
2.5V至5.5V工作输入电压范围
最多可驱动8个系列白色LED
1.2兆赫固定开关频率
脉宽调制调光的宽范围（200Hz至200KHz）
内部1.9A开关电流限制
过电压保护（OVP）
内部软启动功能
电流限制和热关机保护
欠压闭锁

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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The CXAC85182 is a step-up converter designed for driving up to 8 series white LEDs for backlighting application. The CXAC85182 uses current mode, 1.2MHZ fixed frequency architecture to regulate the LED current, which is set through an external current sense resistor. Its low 300mV feedback voltage reduces power loss and improves efficiency. The OV pin monitors the output voltage and turns off the converter if an over-voltage condition is present due to an open circuit condition. The CXAC85182 includes under-voltage lockout, current limiting and thermal shutdown protection preventing damage in the event of an output overload. The driver is available in small 6-pin SOT-23 package.

   产品特点 返回TOP

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 2.5V to 5.5V operating input voltage range 

 Drives up to 8 series White LEDs 

 1.2MHz Fixed Switching Frequency 

 Wide range for PWM dimming (200Hz to 200KHz) 

 Internal 1.9A switching current limit 

 Over Voltage Protection (OVP) 

 Internal Soft-start Function 

 Current limit and Thermal shutdown protection 

 Under voltage Lockout 

 Available in the 6-pin SOT-23 Package

   应用范围 返回TOP

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 Camera Flash White LED 

 Mobile Phone, Smart Phone LED Backlight 

 PDA LED Backlight 

 Digital Still Cameras 

 Camcorder

   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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AC/DC PWM Controller
Product	Status	Device Description	VIN(min~max)	VOUT	IOUT	IQ(typ)	Vfb	Frequency	Pkg
CXAC85182	Active	1.9A固定频率白光驱动	2.5~5V	3-27v	1.9A	170uA	0.3V	1.2MHZ	SOT23-6
CXAC85183	NRFED	1A白光驱动	2.7~4.5V	ADJ	2.5A	100uA	0.1V	1MHZ	SOT23-6
CXAC85184	NRFED	450uA	60KHZ		420mA				TO92
CXAC85185	NRFED	700uA	40KHZ		420mA				SOT23-6 SOP8