lx6512 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 1 www. microsemi . com high performance ccfl controller tm ? l l x x 6 6 5 5 1 1 2 2 copyright ? 2007 rev. 1.3, 10/22/2009 description key features ? full bridge or direct drive push pull configurable ? patented striking topology ? low stress to transformers ? wide dimming range ? programmable operating dimming frequency ? programmable time out protection ? fixed operating frequency ? open lamp voltage protection, short lamp protection, over voltage protection ? compatible with existing transformers applications microsemi?s lx6512 is a cost effective, direct drive ccfl (cold cathode fluorescent lamp) controller. the integrated controller is optimized to drive ccfl?s (cold cathode fluorescent lamps) using either resonant full bridge inverter topology or push-pull direct drive configurations. 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. this new architecture is also coupled with a wide dimming range capability. for fixed input supply applications the lx6512 uses direct drive topology to supply fixed frequency pwm signals connected directly to the high voltage transformer primary via a single pair of n- fet drivers, providing a simple, low cost inverter solution. the lx6512 contains safety features that limit the tran sformer secondary voltage and protect against fault conditions which include open lamp, broken lamp and short-circuit faults. the over voltage fault shutdown is disabled during a user programmable interval to allow lamp strike. the controller can accept a brightness control signal that is either an analog voltage level, or a direct low frequency pwm. utilizing this signal it provides ccfl brightness dimming control using digital dimming, to achieve a wide dimming range (> 60 to 1). an integrated 4v ldo (low dropout regulator) powers all internal control circuitry and up to 5ma for external circuitry greatly simplifying supply voltage requirements. the lx6512 is available in a 16-pin soic, tssop and 3x3 mm 16pin qfn. ? note book lcd displays ? transportable computers ? web tablet lcd displays ? digital picture frame ? monitor / tv portable dvd player 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 u1 lx6512clq gnd 11 vdda 15 vddp 14 f_osc 2 brite_d 1 ea_out 6 ena 4 boh 12 aoh 13 v_sns 7 c_to 5 b_osc 3 vin_sns 16 isns 8 aol 10 bol 9 r7 1m cn1 con8 1 2 3 4 5 6 7 8 t1 u2 1 2 3 4 5 6 7 8 r1 61.9k c12 2.2nf c11 2pf pcb c5 3.9nf cn2 con2 1 2 f1 fuse c2 100nf r4 374 ohm c3 1uf c13 100nf c14 100pf vdda vdda c6 0.1uf r5 115k c4 1uf c9 10uf l ow c omponent c ount r equirement for t otal s ystem s olution package order info thermal data d plastic soic 16-pin j a = 82.2 c/w lq plastic 3x3 mm qfn 16-pin j a = 33.3 c/w pw plastic tssop 16-pin j a = 99 c/w t a ( c) rohs compliant / pb-free thermal resistance - junction to ambient -20 to 85 LX6512CD, lx6512clq or lx6512cpw note: available in tape & reel. append the letters ?tr? to the part number. (i.e. LX6512CD-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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