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LED drivers have optimized synchronization, timing

Posted: 11 Dec 2007 ?? ?Print Version ?Bookmark and Share

Keywords:high-brightness LED driver? LCD backlighting?

austriamicrosystems has extended its high-brightness LED driver portfolio with the introduction of the AS3693 and AS3694 devices, aimed at LED-based LCD backlighting applications including LCD TVs, PC monitors and laptop computers.

The AS3693 and AS3694 LED drivers feature optimized synchronization and timing technologies, which make them well-suited to the latest trend in LCD backlighting, which is to synchronize the LCD backlight with the TV picture. The "local dimming" enables only the required segments of the backlight to be on, making bright spots in the TV picture appear really bright and dark parts completely black. This technology allows OEMs to achieve exceptional contrast ratios as well as energy savings, said the company.

The AS3693 and AS3694 LED drivers also offer driver accuracy of 0.5 percent, which guarantees exact brightness and color matching. The AS3693 offers 16 high-brightness LED output channels, while the AS3694 provides 12 channels and 3 additional DC/DC converters. The brightness and timing of each output can be controlled individually via SPI or I?C interfaces. Local dimming is supported by independent PWM generators with programmable delay, period and duty cycle, resulting in optimized TV pictures which are totally flicker-free, according to austriamicrosystems.

The high-precision LED current sources offer a wide voltage compliance range of 50V supporting the deployment of long LED strings. In addition, an integrated dedicated power supply control technology enables thermal and energy efficient design. Both devices offer safety features for thermal control as well as open and short LED detection.

The AS3693 and AS3694 drivers are available in a TQFP64 package and are specified for an ambient temperature of -20C to 85C.

Demonstrations will be available at austriamicrosystems' off-exhibition suite at CES 2008 in the United States, January 7-10, 2008.

The AS3693 is priced at $ 2.54 and the AS3694 is priced at $ 2.67 each in quantities of 100,000.

- Gina Roos

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