描述 Description

The AL9910-5 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 rather than constant voltage, thus providing constant light output and enhanced reliability. The output current can be programmed between a few milliamps and up to more than 1.0A. The AL9910-5 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 AL9910-5 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. For improved LED?current accuracy the AL9910-5 has a 5% tolerance on the peak current switching threshold. The AL9910-5 is available in the thermally enhanced SO-8EP package

特性 Features

>90% Efficiency
Universal rectified 85 to 277VAC input range
Input voltage up to 500V
Internal voltage regulator removes start-up resistor o 7.5V MOSFET drive – AL9910 o 10V MOSFET drive – AL9910A
Tighter current sense tolerance: 5% AL9910-5
Drives LED?Lamps with both high and low current LEDs
LED?brightness control with Linear and PWM dimming
Internal Thermal Protection (OTP)
SO-8 and SO-8EP in “Green” Molding Compound
(No Br, Sb) with Lead Free Finish/ RoHS Compliant

應(yīng)用 Application

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