LX6504 p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 800-8776458, 714-898-8121, fax: 714-893-2570 page 1 copyright ? 2009 rev.1.0, 2009-09-02 full bridge resonant ccfl controller tm ? www. microsemi . com l l x x 6 6 5 5 0 0 4 4 description key features ? integrated gate drive ? burst dimming range: >20 to 1 ? soft rise/fall for burst dimming control ? programmable strike frequency ? programmable burst dimming frequency ? programmable strike time-out and fault timing protection ? operating status signal output ? fixed operating frequency ? open-lamp voltage protection applications microsemi?s LX6504 is a cost reduced, third generation ccfl (cold cathode fluorescent lamp) controller. the integrated controller is optimized to drive ccfls using resonant full bridge inverter topology. resonant full bridge topology provides near sinusoidal waveforms over a wide supply voltage range in order to maximize the life of ccfl lamps, control emi emissions, and maximize efficiency. the LX6504 includes safety features that limit the transformer secondary voltage and protect against fault conditions which include open lamp, and broken lamp faults etc. a unique programmable strike frequency control is provided with LX6504. by connecting different components on the strike frequency control pin, the user can control the strike frequency profile at will. LX6504 can accept a burst dimming control signal that is either a dc analog voltage or a low frequency pwm. LX6504 also features integrated gate drivers for the four external power mosfets. an integrated 4v ldo powering all internal control circuitry greatly simplifies supply voltage requirement. the LX6504 is available in a 20-pin soic package. ? lcd tv ? lcd monitor ? ccfl backlight system important: : for the most current data, consult microsemi ?s website: http://www.microsemi.com protected by u.s. patents: 5,615, 093; 5,923,129; 5,930,121; 6,198 ,234; 7,112,929; patents pending package order info thermal data dw plastic soic 20-pin j a = 65.8 c/w t a ( c) rohs compliant / pb-free thermal resistance - junction to ambient -20 to 85 LX6504idw note: available in tape & reel. append the letters ?tr? to the part number. (i.e. LX6504idw-tr) junction temperature calculation: t j = t a + (p d x ja ). the ja numbers are guidelines for the thermal performance of the device/pc-board system. all of th e above assume no ambient airflow.
microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 tm ? www. microsemi . com copyright information thank you for your interest in microsemi ? analog mixed signal products. the full data sheet for this device contains proprietary information. to obtain a copy, please contact your loca l microsemi sales representative. the name of your local representative ca n be obtained at the following link http://www.microsemi.com/contact/contactfind.asp or contact us directly by sending an email to: ipgdatasheets@microsemi.com be sure to specify the data sheet you are requesting and include your company name and contact inform ation and or vcard. we look forward to hearing from you.
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