DiodesAL991013WLED替代T8荧光管解决方案

1、Diodes AL9910 13W LED替代T8荧光管解决方案关键词：电源管理,LED驱动器,AC/DC转换器,Diodes 公司的AL9910/A是PWM高效高压高亮LED驱动器控制集成电路.源电压从85VAC到256VAC,输入电压高达500V. AL9910能以固定频率高达300kHz驱动外接MOSFET,输出电流从几毫安到大于1.0A,效率高于90%,主要应用在DC/DC或AC/DC LED驱动器,RGB背光LED驱动器,平板显示器背光,通用恒流源以及装饰LED照明.本文介绍了AL9910/A主要特性,功能方框图, 典型应用电路图和带与不带无源PFC的典型应用电路图,以及15瓦LED

2、替代T8荧光管的电路图,材料清单和PCB布局图.The AL9910/A high voltage PWM LED driver-controller provides an efficient solution for offline high brightness LED lamps from rectified line voltages ranging from 85VACup to 277VAC. The AL9910 drives external MOSFETs at switching frequencies up to 300kHz, with the switching f

3、requency determined by a single resistor. The AL9910 topology creates a constant current through the LEDs providing constant light output. The output current is programmed by one external resistor and is ultimately determined by the external MOSFET chosen and therefore allows many low current LEDs t

4、o be driven as well as a few high current LEDs The LED brightness can be varied by both Linear and PWM dimming using the AL9910s LD and PWM_D pins respectively. The PWM_D input operates with duty ratio of 0100% and frequency of up to several kHz. The AL9910 can withstand input voltages up to 500V wh

5、ich makes it very resilient to transients at standard mains voltages. As well as standard SO-8 package the AL9910 is available in the thermally enhanced SO-8EP package.AL9910/A主要特性和优势: 90% Efficiency Universal rectified 85 to 277VACinput range Input voltage surge ratings up to 500V Internal voltage

6、regulator removes start-up resistoro 7.5V MOSFET drive AL9910o 10V MOSFET drive AL9910A Constant-current LED driver Applications from a few mA to more than 1A Output PWM Low-Frequency Dimming via Enable pin Internal Thermal Protection (OTP) SO-8 and SO-8EP in “Green” Molding Compound (No Br, Sb) Lea

7、d Free Finish/ RoHS CompliantAL9910/A应用: DC/DC or AC/DC LED Driver application RGB Backlighting LED Driver Back Lighting of Flat Panel Displays General purpose constant current source Signage and Decorative LED Lighting图1.AL9910/A功能方框图图2.AL9910/A典型应用电路图图3.AL9910/A带无源PFC的典型应用电路图采用AL9910高压LED控制器的高功率系数

8、LED替代T8荧光管This application note describes the principles and design equations required for the design of a high brightness LED lamp using the AL9910. The equations are then used to demonstrate the design of a universal, offline, high power factor (PF), 13W LED lamp suitable for use as the replacement for T8 fluorescent tube. A complete design including the electrical diagram, component list and performance measurements are provided.图4.