WLED/RGB Backlight Driver suits LCD monitors and televisions.
June 4, 2010 -
Housed in 28-contact, 5 x 5 mm QFN package, Model A8512 integrates boost controller operating in constant frequency current mode control to drive external MOSFET, and 6 internal current-sinks capable of up to 80 mA each. Multiple drivers can be connected in parallel, allowing up to 36 LED strings to be powered by 1 boost converter. Operating from single 8-24 V supply, driver provides protection against overvoltage, open or shorted LED string, and over-temperature.
(Archive News Story - Products mentioned in this Archive News Story may or may not be available from the manufacturer.)
Original Press release
Allegro MicroSystems Inc.
115 N.E. Cutoff, P.O. Box 15036
Worcester, MA, 01615
USA
Allegro MicroSystems, Inc. Announces a New LED Backlight Driver for Medium/Large Displays
Ideal for LED Backlit LCD Monitors and Televisions
Worcester, MA - Allegro MicroSystems, Inc. announces a new multi-output WLED/RGB driver for LED backlighting of LCD monitors and televisions. This new device integrates a boost controller operating in operates in constant frequency (programmable) current mode control, driving an external MOSFET. It integrates six internal current-sinks capable of up to 80 mA each, and they can be combined together to achieve even higher currents. PWM dimming allows LED currents to be precisely controlled as a percentage of the maximum setpoint determined by the user.
Furthermore, multiple A8512s can be connected in parallel, with one master controller controlling the boost stage, and up to five slave controllers, which act as LED sinks. This allows up to 36 LED strings to be powered by just one boost converter significantly reduce the number of external components required.
The A8512 operates from a single supply of 8 to 24 V. It provides protection against overvoltage, open or shorted LED string, and overtemperature. A dual level cycle-by-cycle current limit function provides soft start and protects against overloads.
The A8512 is provided in a 28-contact 5 mm × 5 mm QFN package (ET), with an exposed thermal pad for enhanced thermal dissipation. For single-sided PCB manufacturing capability, the device is also available in a 24-pin SOICW package (LB), with internally fused pins for enhanced thermal dissipation. Both packages are lead (Pb) free, with 100% matte tin leadframe plating. The QFN version is priced at $1.65 in quantities of 1,000.
About Allegro
Allegro MicroSystems, Inc. is a leader in developing, manufacturing and marketing high-performance power and Hall-effect sensor integrated circuits. Allegro's innovative solutions serve high-growth applications within the automotive, communications, computer/office automation, consumer and industrial markets. Allegro is headquartered in Worcester, Massachusetts (USA) with design and applications centers located in North and South America, Asia, and Europe. Further information about Allegro can be found at www.allegromicro.com.
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