Diodes AL9910通用高壓高亮LED驅(qū)動方案

Diodes 公司的AL9910/A是PWM高效高壓高亮LED驅(qū)動器控制集成電路.源電壓從85VAC到256VAC,輸入電壓高達(dá)500V. AL9910能以固定頻率高達(dá)300kHz驅(qū)動外接MOSFET,輸出電流從幾毫安到大于1.0A,效率高于90%,主要應(yīng)用在DC/DC或AC/DC LED驅(qū)動器,RGB背光LED驅(qū)動器,平板顯示器背光,通用恒流源以及裝飾LED照明.本文介紹了AL9910/A主要特性,功能方框圖, 典型應(yīng)用電路圖和帶與不帶無源PFC的典型應(yīng)用電路圖.

UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER、

The AL9910/A is a PWM high-efficiency LED driver control IC. It allows efficient operation of High Brightness (HB) LEDs from voltage sources ranging from 85VAC up to 265VAC. The AL9910 controls an external MOSFET at fixed switching frequency up to 300kHz. The frequency can be programmed using a single resistor. The LED string is driven at constant current and provides constant light output and enhanced reliability. The output current can be programmed between a few milliamps and up to more than 1.0A.

The AL9910 uses a rugged high voltage junction isolated process that can withstand an input voltage surge of up to 500V. Output current to an LED string can be programmed to any value between zero and its maximum value by applying an external control voltage at the linear dimming control input of the AL9910. The AL9910 provides a low-frequency PWM dimming input that can accept an external control signal with a duty ratio of 0-100% and a frequency of up to a few kHz.

As well as standard SO-8 package the AL9910 is available in the thermally enhanced SO-8EP package.

AL9910/A主要特性:

? >90% Efficiency

? Universal rectified 85 to 265VAC 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

? Drives LED Lamps from a few mA to more than 1A

? 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應(yīng)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

圖1.AL9910/A功能方框圖

圖2.AL9910/A典型應(yīng)用電路圖

圖3.AL9910/A典型應(yīng)用電路圖(無PFC)

圖4.AL9910/A帶無源PFC的典型應(yīng)用電路圖
詳情請見:
http://www.diodes.com/datasheets/AL9910_A.pdf