- Design Center
- About Allegro
July 16, 2013
Worcester, MA – Allegro MicroSystems, LLC announces a new programmable multi-output LED driver for LCD backlighting, instrument clusters, and daytime running lights. Allegro’s™ A8517 integrates a current-mode boost converter with internal power switch and 10 I²C programmable current sinks, and can provide 5,000:1 contrast ratio PWM dimming at 200 Hz. The IC operates from 4.5 to 36 V, and is able to withstand up to 40 V load-dump conditions encountered in automotive systems.
The I²C interface allows the user to set the LED currents individually, up to 60 mA per LED channel. Adjacent channels may be combined to drive higher-current LED strings. The PWM dimming duty cycle is also independently controlled for each LED channel, and each channel can be enabled/disabled independently if needed. This flexibility makes the A8517 a single solution for a wide range of LED applications, in some cases offering the ability to replace two or more LED driver ICs with a single device.
The A8517 provides protection against output short and overvoltage, open or shorted diode, open or shorted LED pin, shorted boost switch or inductor, and IC over-temperature. A dual level cycle-by-cycle current limit protects the internal switch against switch over-current. If needed, the IC can drive an external P-FET as input-disconnect switch that is triggered by an integrated current sense. The A8517KLPTR-T is available in a 28-pin eTSSOP package.
Allegro MicroSystems is redefining the future of power and sensing technologies. From green energy to advanced mobility and motion control systems, our team is passionate about developing intelligent solutions that move the world forward and give our customers a competitive edge. With global engineering, manufacturing and support, Allegro is a trusted partner to both large enterprises and regional market leaders worldwide. Visit www.allegromicro.com.