AS3492 DB REV 2.0

austriamicrosystems AG is now ams AG The technical content of this austriamicrosystems application note is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30 8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 e-Mail: ams_sales@ams.com Please visit our website at www.ams.com AS3674 - AN01 - Demo Board Preliminary Application Note Application Note AS3492 Highly Efficient 2-10 LEDs Backlight Driver with 2 PWM Inputs 1 General Description 0+]'&'&%RRVWFRQYHUWHU 6PDOOȝ+H[WHUQDOFRLO 9HU\KLJKDSSOLFDWLRQHIILFLHQF\RIXSWR 9HU\ORZYROWDJHFKDQJHVRQRXWSXWWRDYRLG G DFRXVWLFQRLVHRQRXWSXWFDSDFLWRUHYHQZLWK3:0 ZLWK3:0 :0 6PRRWKVWDUWXSHYHQXQGHUORZGXW\F\FOH3:0 FOH3:0 3:0 FRQGLWLRQV )LYH&XUUHQWVRXUFHVXSWRP$ $ /RZYROWDJHFRPSOLDQFHP9 P9 +LJKVLGHFXUUHQWVRXUFHWRVLPSOLI\OD\RXWDQG WRVLPSOLI\OD\RXWDQG RVLPSOLI\OD\RXWDQ WKHUPDOPDQDJHPHQWRIWKH/('V RIWKH/('V IWKH/('V $XWRPDWLFDOO\GHWHFWDQGGLVDEOHIDLOLQJRUQRWXVHG $  HFWDQGGLVDEOHIDLOLQJ GGLVDEOHIDLOLQ /('VWRNHHSHIILFLHQF\KLJK /( /(' HIILFLHQF\KLJK HQF\KLJK &XUUHQWPDWFKLQJ & &X LQJ  &XUUHQWDFFXUDF\ DFFX  ([FHOOHQW/('FXUUHQWRXWSXWULSSOHȝ$ HQW/('FXU /('F RXWSX 6XSSRUW'/6'\QDPLF/XPLQDQFH6FDOLQJRU'%& SSRUW'/6'\QDP '/6'\QDP 8QGHUYROWDJHORFNRXWDQGRYHUFXUUHQWSURWHFWLRQ 8QGHUYROWDJHORFNRXW HUYROWDJHORFNRXW 2YHUWHPSHUDWXUHSURWHFWLRQ 2YHUWHPSHUDWXUHS HUWHPSHUDWXUH $YDLODEOHLQDWLQ\:/&63SDFNDJH $YDLODEOHLQ $YDLODEOHLQDW [EDOOVPPSLWFK[[PP [EDOOV • lv al • id 2 Key Features am s on A te G nt st il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  7KH$6LQFOXGHVVHYHUDOSURWHFWLRQIXQFWLRQVOLNH XQGHUYROWDJHORFNRXWRYHUFXUUHQWDQGRYHUWHPSHUDWXUH H 1RPLFURYLDVDUHUHTXLUHGWRDVVHPEOHWKH$6LI LI RQO\IRXUFKDQQHOVDUHXVHGDQG21 21  7KH$6LVDYDLODEOHLQDVSDFHVDYLQJ:/&63 J:/&63 :/&63 SDFNDJHPHDVXULQJRQO\[[PPDQGRSHUDWHV PDQGRSHUDWHV RYHUWKHž&WRž&WHPSHUDWXUHUDQJH HUDQJH UDQJH • • • • • 3 App Application Te 'LVSOD\ED 'LVSOD\EDFNOLJKWGULYHUIRUPRELOHSKRQHVGLJLWDOFDPHUDV 'LVSOD\ 31'DQG303V 31'DQ  www.austriamicrosystems.com (jen) Revision 1.0 / 4/18/2012 1-8 AS3492 Demo Board 2V0 Preliminary Application Note 7DEOHRI&RQWHQWV *(1(5$/'(6&5,37,21   .(