CXLE8851固定180KHz开关频率8V至36V输入电压3A开关电流PWM控制电路能够将占空比从0%线性调整到100%带输出恒流回路电流限制函数

CXLE8851是一个180kHz的固定频率脉冲宽度调制降压（降压）DC/DC转换器，能够以高效率、低纹波和良好的线路和负载调节驱动2.5A负载。该调节器需要最少数量的外部元件，使用简单，包括内部频率补偿和固定频率振荡器。
该PWM控制电路能够将占空比从0%线性调整到100%。内置过流保护功能。当发生短路保护时，工作频率由180KHz降低到48KHz。内置一个内部补偿块以最小化外部组件计数。
n宽8V至36V输入电压范围
n输出可从1.25伏调整到32伏
n最大占空比100%
n最小压降0.3V
n固定180KHz开关频率
n最大3A开关电流
n内部优化功率MOSFET
n高效率
n优良的线路和负载调节
n带输出恒流回路
n内置热关机功能
n内置电流限制函数
n内置输出短路保护功能

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 CXLE8851 is a 180 KHz fixed frequency PWM buck (step-down) DC/DC converter, capable of driving a 2.5A load with high efficiency, low ripple and excellent line and load regulation. Requiring a minimum number of external components, the regulator is simple to use and include internal frequency compensation and a fixed-frequency oscillator. 

The PWM control circuit is able to adjust the duty ratio linearly from 0 to 100%. An over current protection function is built inside. When short protection function happens, the operation frequency will be reduced from 180KHz to 48KHz. An internal compensation block is built in to minimize external component count.

   产品特点 返回TOP

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n Wide 8V to 36V Input Voltage Range 

n Output Adjustable from 1.25V to 32V 

n Maximum Duty Cycle 100% 

n Minimum Drop Out 0.3V 

n Fixed 180KHz Switching Frequency 

n Maximum 3A Switching Current 

n Internal Optimize Power MOSFET 

n High efficiency 

n Excellent line and load regulation 

n With output constant current loop 

n Built in thermal shutdown function 

n Built in current limit function 

n Built in output short protection function 

n Available in SOP8L package

   应用范围 返回TOP

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n Car Charger 

n Battery Charger 

n LCD Monitor and LCD TV 

n Portable instrument power supply 

n Telecom / Networking Equipment

   技术规格书（产品PDF) 返回TOP 

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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！

 

产品封装图 返回TOP

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电路原理图 返回TOP

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降压型LED射灯驱动IC
型号	工作电压范围	输出电流	输出电 流精度	线性调 整率	效率	工作频率	调光功能	封装
CXLE8835ES	6V-40V	1.2A	3%	1.50%	98%	1MHz(max)	PWM调光	ESOP8
CXLE8835MR	6V-40V	1.2A	3%	1.50%	98%	1MHz(max)	PWM调光	SOT-26
CXLE8836	6V-60V	1.2A	2%		94%	1.1MHz	PWM/模拟 调光	SOT-89-5
CXLE8837	2V-6.5V	0.95A	10%	0.45%	92%	1.4 MHz	PWM调光	SOT-25
CXLE8838	2.5V-5.5V	0.7A	3%		93%	1.4MHz	PWM调光	SOT-25
CXLE8839	5.5V-36V	扩流2.5A	1%		96%	1MHz	PWM调光	SOT-26
CXLE8840	4V--28V	扩流25W	1%		96%	2MHz	PWM/模拟 调光	SOT-26
CXLE8841	2.5V-100V	扩流2.5A	1%		90%	1MHz	PWM调光	SOT-26
CXLE8842	5-100V	1.5A	1%		92%	1MHz	PWM/模拟 调光	ESOP8
CXLE8843	5-100V	2.5A	1%		92%	1MHz	PWM/模拟 调光	ESOP8
CXLE8844	6V-100V	扩流3A	3%		95%	200KHz	PWM调光	SOT-26
CXLE8845	8V-45V	3A	3%		95%	220KHz		ESOP8
CXLE8846	8V-40V	4A	3%		95%	220KHz	PWM调光	TO252-5L
CXLE8847	8V-40V	5A	3%		95%	220KHz		TO263-5L
CXLE8848	5V-36V	1.5A	2%		96%	380KHz	PWM调光	SOP-8
CXLE8849	4.5V-45V	2A	2%		83%	150KHz	PWM调光	ESOP8
CXLE8850	8V-45V	3A	2%		89%	150KHz		ESOP8
CXLE8851	8V-40V	3A	2%		89%	180KHz		SOP8
CXLE8852	8V-40V	3.5A	2%		87%	180KHz	PWM调光	ESOP8
CXLE8853	8V-40V	2A	2%		89%	110KHz		SOP8
CXLE8854B	7V-40V	2.5A	2%		89%	250KHz		ESOP8
CXLE8855	8V-40V	5A	2%		86%	150KHz		TO263-5L
CXLE8835	6V-40V	1.2A	3%	1.50%	98%	1MHz(max)	PWM调光	SOT89-5
CXLE8835B	6V-34V	1.0A	5%	1.50%	97%	1MHz(max)	PWM/模拟 调光	SOT89-5