austriamicrosystems has co-developed a new high precision LED driver with LG.Philips LCD, a leading provider of LCD displays. Designed for LCD TV backlight applications, the innovative AS3693 allows dimming of multiple segments of the LCD TV backlight, enabling highest contrast ratios and best picture quality.
So-called block dimming results in only the required segments of the backlight being on, making bright spots in the TV picture really bright and dark parts completely black.
The AS3693 offers control of 16 LED channels, where each channel can be controlled completely independently via built-in PWM generators while withstanding up to 50 V.
The device offers high-precision current control of 0,5% accuracy, and a chain of drivers can be controlled via SPI or I²C for larger LCD panels. External clock and synchronising inputs allow the synchronisation of the LCD backlight with the TV picture. Built-in safety features include thermal shutdown as well as open- and short-circuit LED detection.
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