For TV and monitor manufacturers needing a cost-effective solution for driving LED backlights, Diodes Incorporated has introduced a constant-frequency, voltage-mode, external-compensation boost controller. The highly-integrated AL3022 is supplied in the small footprint SO-8 package and significantly reduces the number of external components required for system design.
Operating at a fixed switching frequency of 140kHz, the controller handles up to 60W output power, and is suitable for a wide range of 14-inch to 42-inch LCD panel designs. The device uses a 200mV voltage reference to help minimize losses, thus improving system efficiency in many cases.
To improve overall system reliability, the controller offers a complete suite of integrated protection features. Included in the device are under-voltage lockout, over-voltage, over-current and over-temperature protection circuits, as well as protection against output-to-ground short circuits.
The AL3022 boost controller is priced at $0.18USD each in 100k piece quantities. The device is supported by a data sheet, design note and an LED calculator for external component selection. An evaluation board (ref: AL3022EV1) is also available to qualifying customers.
source: http://www.powerpulse.net/story.php?storyID=30782
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