AS3694 product brief www.austriamicrosystems.com (mpa) revision 1.1 / 2007-11-25 1 - 3 1 general description the AS3694 is a 12 cannels high precision led driver with build in pwm generators for building backlight panels in lcd-tv-sets. 3 dcdc step up controllers can be used to build the power supplies for red, green and blue led strings. external clock and synchronizing inputs allow the synchronization of the lc d backlight with the tv picture. local dimming and scan dimming is supported by 12 independent pwm generators with programmable delay, period and duty cycle. three free configurable dynamic power feedback circuits make the device usable for white led as well as rgb backlights. build in safety features include thermal shutdown as well as open and short led detection. all circuit parameters are programmable via i2c or spi interface. 2 key features ? 12 independent led channels ? output current 70ma ? output voltage up to 50v ? absolute current accuracy 0.5% ? output slew rate lim ited to reduce emi ? current programmable with external resistor ? 12 independent pwm generators with 12 bit resolution ? h-sync, f-sync inputs to synchronize with tv- set ? three independent power feedback for r-, g-, b-supply regulation ? build in 5v shunt regulator ? i2c or spi interface with 6 bit address ? fault interrupt output ? open led detection ? short led detection ? temperature shutdown ? 3 dcdc step up controller ? current mode ? efficiency > 90% ? input voltage range 15v to 50v ? output voltage up to 50v / 200ma ? package eptqfp64 3 application led backlighting for lcd ? tv sets and monitors AS3694 12 channel high precision led dr iver for lcd backlight and 3 dcdc step up controller product brief
AS3694 product brief www.austriamicrosystems.com (mpa) revision 1.1 / 2007-11-25 2 - 3 block diagram spi / i2c interface vreg vsupply hsync vsync scl sda sdo cs v2_5 ref fbr fbb fbg AS3694 v2_5 addr2 addr1 fault pwm boost red pwm pwm pwm pwm pwm 86 byte registers pwm pwm pwm pwm pwm pwm gnd vsupply v_red boost green vsupply v_green boost blue vsupply v_blue reference, dac fault detectors smps feedback fbg fbr fbb
AS3694 product brief www.austriamicrosystems.com (mpa) revision 1.1 / 2007-11-25 3 - 3 copyright copyright ? 1997-2007, austriamicrosystems ag, schl oss premstaetten, 8141 unte rpremstaetten, austria- europe. trademarks registered ?. all rights reserved. t he material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. all products and companies mentioned are trademarks or registered trademarks of their respective companies. diclaimer devices sold by austriamicrosystems ag are covered by the warranty and patent indemnification provisions appearing in its term of sale. austriamicrosystems ag make s no warranty, express, stat utory, implied, or by description regarding the information set forth herein or regarding the freedom of t he described devices from patent infringement. austriamicrosystems ag reserves the ri ght to change specifications and prices at any time and without notice. therefore, prior to designing this pr oduct into a system, it is necessary to check with austriamicrosystems ag for current information. this product is intended for use in normal commercial ap plications. applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or lifesustaining equipment are specifically not recommended without additional processing by austriamicrosystems ag for each application. for shipm ents of less than 100 parts the manufacturing flow might show deviations from the standard production fl ow, such as test flow or test location. the information furnished here by austriamicrosystems ag is believed to be correct and accurate. however, austriamicrosystems ag shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profit s, loss of use, interruption of business or indirect, special, incidental or consequential da mages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. no obligation or liability to re cipient or any third party shall arise or flow out of austriamicrosystems ag rendering of technical or other services. contact information headquarters austriamicrosystems ag a-8141 schloss premst?tten, austria t. +43 (0) 3136 500 0 f. +43 (0) 3136 5692 for sales offices, distributors and representatives, please visit: http://www.austriamicrosystems.com/contact
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