LX6512A p roduct brief microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 1 w w w . m i c r o s e m i . c o m high performance ccfl controller tm ? l l x x 6 6 5 5 1 1 2 2 a a copyright ? 2010 rev. 1.0, 7/2/2010 d e s c r i p t i o n k e y f e a t u r e s ? full bridge or direct drive push pull configurable ? patented striking technology ? 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 transformer designs a p p l i c a t i o n s microsemi?s LX6512A is a cost effective, high performance 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 configuration. resonant full bridge topology provides soft switching performance that helps to achieve near sinusoidal waveforms over a wide input voltage range, maximize the life of ccfl lamps, lower switching noise and emi emissions, and maximize the inverter operating efficiency. this architecture is also coupled with a quiet operation over wide dimming range. for narrow range input applications the drive signal format of LX6512A allows the user to configure a push-pull circuit. only a single pair of n-fet is needed to be driven by the signals from LX6512A directly and thus providing a simple, low cost inverter solution. the LX6512A contains safety features that limit the transformer secondary voltage and protect against fault conditions including open lamp or broken lamp, over voltage, arcing, and short-circuit fault. in addition, a programmable strike time out allows the user to set suitable strike time for a successful lamp strike for different applications. the controller also provides convenient means for lamp brightness control. with the programmable dimming frequency oscillator, it allows to use an analog dc input to perform a digital dimming at the programmed frequency. alternatively, an external pwm signal can also be applied to the dimming control pin to achieve a direct digital dimming control. an integrated 4v ldo (low dropout regulator) supplies all the internal control circuit and up to 5ma to the external circuitry to minimize the external voltage supply requirement. the LX6512A is available in a 16-pin soic package. ? note book lcd displays ? transportable computers ? web tablet lcd displays ? digital picture frame ? monitor / tv applications ? 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 LX6512A gnd 13 vdda 1 vddp 16 f_osc 4 brite_d 3 ea_out 8 ena 6 boh 14 aoh 15 v_sns 9 c_to 7 b_osc 5 vin_sns 2 isns 10 aol 12 bol 11 r7 1m cn1 1 2 3 4 5 6 7 8 t1 u2 1 2 3 4 5 6 7 8 r1 61.9k c5 3.9nf cn2 1 2 f1 fuse c2 100nf r4 374 ohm c3 1uf c13 100nf c14 100pf vdda c6 0.1uf r5 115k c4 1uf c9 10uf r8 10m r9 10k l ow c omponent c ount r equirement for t otal s ystem s olution package order info t h e r m a l d a t a d plastic soic 16-pin ? j a = 82.2 ? c/w t a ( ? c) rohs compliant / pb-free thermal resistance - junction to ambient -20 to 85 LX6512Acd note: available in tape & reel. append the letters ?tr? to the part number. (i.e. LX6512Acd-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 the above assume no ambient airflow.
LX6512A p roduct brief microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 2 w w w . m i c r o s e m i . c o m high performance ccfl controller tm ? l l x x 6 6 5 5 1 1 2 2 a a copyright ? 2010 rev. 1.0, 7/2/2010 a b s o l u t e m a x i m u m r a t i n g s p a c k a g e p i n o u t supply input voltage (vddp) ...........................................................................................-0.3v to 7v digital inputs (enable)................................................................................................-0.3v to 5.5v analog inputs (i_sns, v_sns) ............................................. +/- 14v. max peak current +/-100ma analog inputs ( brite_d, vin_sns, f_osc, b_osc) ............................................. -0.3v to 5.5v analog outputs (ea_out,c_to) .................................................................................-0.3v to 5.5v analog output (vdda) .................................................................................................-0.3v to 5.5v driver outputs (aol, aoh, bol, boh) ......................................................................-0.3v to 5.5v maximum operating junction temperature ................................................................................150 ? c storage temperature range.......................................................................................... -65 ? c to 150 ? c lead temperature (soldering 10 seconds....................................................................................300 ? c package peak temp. for solder reflow (40 seconds maximum exposure)......................260c (+0 -5) notes: exceeding these ratings could cause damage to the device. all voltages are with respect to ground. currents are positive into, negative out of specified terminal. m s c l x 6 5 1 2 a c d x x x x enable brite_d b_osc f_osc vdda c_to ea_out vin_sns aoh vddp aol gnd v_sns i_sns bol boh d p ackage (top view) rohs/pb-free 100% matte tin finish xxxx = date code / lot identifier
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