austriamicrosystems has extended its high brightness LED driver portfolio with the AS3693 and AS3694, especially designed to support LED-based LCD backlighting applications.
The new LED drivers feature optimised synchronisation and timing technologies and are suited to the latest trend in LCD backlighting which is to synchronise the LCD backlight with the TV picture. So-called 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. These drivers also offer outstanding driver accuracy of ±0,5% to guarantee exact brightness and colour matching.
The AS3693 offers 16 high brightness LED output channels, while the AS3694 provides 12 channels and three additional DC-DC converters. The brightness and timing of each output can be controlled individually via SPI or I²C interfaces. Local dimming is supported by independent PWM generators with programmable delay, period and duty cycle, resulting in optimised TV pictures which are totally flicker-free.
The drivers have a wide voltage compliance range of 50 V, supporting the deployment of long LED strings. In addition, an integrated dedicated power supply control technology enables thermal- and energy-efficient design. The supply voltage for the AS3693 and AS3694 is derived from the LED supply voltage via the built-in shunt regulator. Both devices offer safety features for thermal control as well as open and short LED detection.
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