标签：LED 照明 光源

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Diodes 公司的AL9910/A是PWM高效高压高亮LED集成电路由驱动器控制.源电压从85VAC到256VAC,输入电压高达500V. AL9910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,主要用于90%以上的效率DC/DC或AC/DC LED驱动器,RGB背光LEDiodesD驱动、平板显示背光、通用恒流源和装饰LED照明.本文介绍了AL9910/A主要特点，功能方框图， 典型的应用电路图和带是否无源PFC典型的应用电路图和15瓦LED替代T8荧光管电路图、材料清单及PCB布局图.

AL9910/A主要特点和优点：

>90% Efficiency

Universal rectified 85 to 277VAC input range

Input voltage surge ratings up to 500V

Internal voltage regulator removes start-up resistor

o 7.5V MOSFET drive – AL9910

o 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)

Lead Free Finish/ RoHS Compliant

AL9910/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典型的应用电路图

图3.AL9910/A带无源PFC的典型应用电路图

采用AL9910高压LED高功率系数控制器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. LED替代T荧光管驱动器外形图

图5.高功率系数15瓦LED灯电路图

15瓦LED照明材料清单：

图6.15瓦LED灯顶和底布局图