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? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7314 ? lcd backli ght inverter drive ic october 2007 fan7314 rev. 1.0.4 fan7314 lcd backlight inverter drive ic features ? high-efficiency single-stage power conversion ? wide input voltage range: 5v to 25.5v ? back light lamp ballast and soft dimming ? reduces number of required external components ? precision voltage reference trimmed to 2% ? zvs half-bridge topology ? soft start ? pwm control at fixed frequency ? analog and burst dimming function ? programmable striking frequency ? open-lamp protection ? open-lamp regulation ? 20-pin soic description the fan7314 provides all the control functions for a series parallel resonant converter as well as a pulse width modulation (pwm) controller to develop a supply voltage. typical operating frequency range is between 30khz and 250khz, depending on the ccfl and the transformer's characteristics. ordering information all packages are lead free pe r jedec j-sdd-020b standard. protected by u.s. patent: 5,652,479. 20-soic part number package operating temperature range packing method FAN7314M 20-soic -25c ~ 85c rail FAN7314Mx 20-soic tape & reel
fan7314 ? lcd backli ght inverter drive ic ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7314 rev. 1.0.4 2 internal block diagram figure 1. functional block diagram bdim s_s ea_out oscillator rt error amp. ea_in 6 a - + ct max. 2v min. 0.5v adim outb outa outc outd - + v in 2.5v ref ena uvlo 5v uvlo ref bct + - max. 2v min. 0.5v olr - + 2v - + 1.4v s olr q q set clr s r uvlo olp - + pgnd s burst voltage reference & internal bias v in 1.4 a uvlo output driver output control logic agnd s olr 105 a s burst 85 a output driver + + - 2.4v v a + v olp v olp + 2.5v 1.5v fan7314 rev.03 rt1 m rt1 striking logic olp s_s 2.65v
fan7314 ? lcd backli ght inverter drive ic ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7314 rev. 1.0.4 3 pin configuration figure 2. pin configuration (top view) pin definitions pin # name description pin # name description 1 olp open-lamp protection 11 bct burst dimming timing capacitor 2 olr open-lamp regulation 12 rt timing resistor 3 ena enable input 13 ct timing capacitor 4 s_s soft-start 14 outd nmosfet drive output d 5 gnd analog ground 15 outc pmosfet drive output c 6 ref 2.5v reference voltage 16 pgnd power ground 7 adim analog dimming input 17 v in supply voltage 8 bdim burst dimming input 18 outa pmosfet drive output a 9 ea_in error amplifier input 19 outb nmosfet drive output b 10 ea_out error amplifier output 20 rt1 striking frequency resistor fan7314 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 olp olr ena s_s ref adim bdim ea_in ea_out gnd outc rt1 outb outa v in pgnd outd ct rt bct fan7314 rev. 03
fan7314 ? lcd backli ght inverter drive ic ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7314 rev. 1.0.4 4 absolute maximum ratings the ?absolute maximum ratings? are those values beyond wh ich the safety of the device cannot be guaranteed. the device should not be operated at these limits. the parametric values defined in the electrical characteristics tables are not guaranteed at the absolute maximum ratings. notes: 1. thermal resistance test board size: 76.2 ? 114. 3 ? 1.6mm (1s0p). jedec standard: jesd51-2, jesd51-3. 2. assume no ambient airflow. electrostatic discharge level symbol characteristics min. max. unit v in supply voltage 5.0 25.5 v t a operating temperature range -25 +85 c t j junction temperature +150 c t stg storage temperature range -65 + 150 c ja thermal resistance junction-to-ambient (1)(2) 90 c/w p d power dissipation 1.4 w parameter pins conditions level unit human body model (hbm) all pins r=1.5k , c=100pf 2000 v machine model (mm) all pins except for bdim c=200pf 300 bdim 250
fan7314 ? lcd backli ght inverter drive ic ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7314 rev. 1.0.4 5 electrical characteristics for typical values, t a =25c and v in =12v. for min./max. values, t a is the operating ambient temperature range with -25c t a 85c and 5v v in 25.5v, unless otherwise specified. specif ications to -25c ~ 85c are guaranteed by design based on final characterization results. note: 3. these parameters, although guarante ed, are not 100% tested in production. symbol characteristics test condition min. typ. max. unit reference section (recommend x7r capacitor) v ref line regulation 5 v in 25.5v 2 25 mv v 25 2.5v regulation voltage 2.45 2.50 2.55 v oscillator section (main) f osc oscillation frequency t a =25c, ct=270pf, rt=18k 110.4 115.0 119.6 khz ct=270pf, rt=18k 108 115 122 v cth ct high voltage 2.0 v v ctl ct low voltage 0.5 v oscillator section (burst) f oscb oscillation frequency t a =25 c, c tb =10nf, rt=18k 209.25 225.00 240.75 hz c tb =10nf, rt=18k 206.25 225.00 241.75 v bcth bct high voltage 2 v v bctl bct low voltage 0.5 v error amplifier section a v open-loop gain (3) 80 db g bw unit gain bandwidth (3) 1.5 mhz v eh feedback output high voltage ea_in=0v 2.0 2.4 2.8 v l sin output sink curre nt ea_out=1.5v -1 ma l sur output source current ea_out=1.5v 1 ma i olr ea_in driving current on olr 75 105 135 a i burst ea_in driving current on burst dimming 61 85 109 a v fbh feedback high voltage on burst dimming r (ea_in)=60k v a +0.1 v a +0.4 v a +0.7 v soft-start section i ss soft-start current s_s=1v 4 6 8 a v ssh soft-start clamping voltage 2.30 2.65 3.00 v protection section v olp0 open-lamp protection voltage 0 s tart at open lamp 2.2 2.5 2.8 v v olp1 open-lamp protection voltage 1 normal -> open lamp 1.3 1.5 1.7 v v olr open-lamp regulation voltage 1.75 2.00 2.25 v i olp open-lamp protection charging current 0.7 1.4 2.1 a under-voltage lock out section v th start threshold voltage 5 v i st start-up current v in =v th -0.2 130 180 a i op operating supply current v in =12v 1.5 4.0 ma i sb stand-by current v in =12v 200 370 a
fan7314 ? lcd backli ght inverter drive ic ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7314 rev. 1.0.4 6 electrical characteristics (continued) for typical values, t a =25c and v in =12v. for min./max. values, t a is the operating ambient temperature range with -25c t a 85c and 5v v in 25.5v, unless otherwise specified. specif ications to -25c ~ 85c are guaranteed by design based on final characterization results. note: 4. these parameters, although guarante ed, are not 100% tested in production. symbol characteristics test condition min. typ. max. unit on/off section v on on state input voltage 2 5 v v off off stage input voltage 0.7 v output section v pdhv pmos gate high voltage v in =12v v in v v phlv pmos gate low voltage v in =12v v in -10.5 v in -8.5 v in -6.5 v v ndhv nmos gate drive vulgate v in =12v 6.5 8.5 10.5 v v ndhv nmos gate drive vulgate v in =12v 0 v v puv pmos gate voltage with uvlo activated v in =v th -0.2 v in -0.3 v v nuv nmos gate voltage with uvlo activated v in =v th -0.2 0.3 v t r rising time (4) v in =12v, c load =2nf 200 500 ns t f falling time (4) v in =12v, c load =2nf 200 500 ns maximum / minimum overlap min. overlap between diagonal switches (4) f osc = 100khz 0 % max. overlap between diagonal switches (4) f osc = 100khz 100 % delay time pdr_a/ndr_b (4) rt=18k 450 ns pdr_c/ndr_d (4) rt=18k 450 ns
fan7314 ? lcd backlight inverter drive ic ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7314 rev. 1.0.4 7 function description uvlo : the under-voltage lockout circuit guarantees stable operation of the ic?s control circuit by stopping and starting it as a function of the v in value. the uvlo circuit turns on the control circuit when v in exceeds 5v. when v in is lower than 5v, the ic?s standby current is less than 200a. ena : applying voltage higher than 2v to the ena pin enables the operation of the ic. applying voltage lower than 0.7v to the ena pin disables the operation of the inverter. soft-start : the soft-start function requires that the s_s pin is connected through a capacitor to gnd. a soft-start circuit ensures a gradual increase in the input and output power. the capacitor connected to the s_s pin determines the rate at which the duty ratio rises. it is charged by a 6a current source. figure 3. soft-start during initial operation main oscillator : the timing capacitors (cts) are charged by the reference current source, which is formed by the timing resistor (rt). the timing resistor?s voltage is regulated at 1.25v. the sawtooth waveform charges up to 2v. once this voltage is reached, the capacitors begin discharging down to 0.5v. next, the timing capacitors start charging again and a new switching cycle begins. the main frequency can be programmed by adjusting the rt and ct values. the main frequency can be calculated as shown below. figure 4. main oscillator waveform burst oscillator and burst dimming : the timing capacitors (bcts) are charged by the reference current source, which is formed by the timing resistor (rt). the timing resistor?s voltage is regulated at 1.25v. the sawtooth waveform charges up to 2v. once this voltage is reached, the capacitors begin discharging down to 0.5v. next the timing capacitors start charging again and a new switching cycle begins. the burst dimming frequency can be programmed by adjusting the rt and bct values. the burst dimming frequency can be calculated as shown below. to avoid visible flicker, the burst dimming frequency should be greater than 120hz. by comparing the input of bdim pin with the 0.5~2v triangular wave of the burst oscillator the pwm pulses for burst dimming. the pwm pulse controls ea_out?s voltage by summing 85a into the ea_in pin. op 19 f 32 rt ct = ?? (1) burst 3.75 f 96 rt ct = ?? (2)
fan7314 ? lcd backlight inverter drive ic ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7314 rev. 1.0.4 8 figure 5. burst oscillator waveform figure 6. burst dimming open-lamp regulation and open-lamp protection : it is necessary to suspend power stage operation if an open lamp occurs, because the power stage has high gain. when a voltage higher than 2v is applied to the olr pin, the part enters regulation mode and controls the ea_out voltage. this limits the lamp voltage by summing 105a into the feedback node. at the same time, the olp capacitor, connected to the olp pin, is charged by the 1.4a internal current source. once it reaches 2.5v, the ic shuts down and all the output is high. figure 7. olr voltage during striking mode output drives : the four output drives are designed so that switches a and b, c and d never turn on simultaneously. the outa-outb pair is intended to drive one half-bridge in the external power stage. the outc-outd pair drives the other half-bridge.
fan7314 ? lcd backli ght inverter drive ic ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7314 rev. 1.0.4 9 timing diagram the fan7314 uses the half-bridge to drive ccfl. ct sync pout a nout b pout c nout d ea_ out t fan7314 rev. 02
fan7314 ? lcd backli ght inverter drive ic ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7314 rev. 1.0.4 10 typical application circuit 1. schematic 2. transformer schematic diagram supported by namyang electronics (http://www.namyangelec.co.kr) 3. core & bobbin ? core: efd2124 ? material: pl7 ? bobbin: efe2124 application lamps input voltage 19 inch lcd monitor 4 13v 0 olp1 r17 1k d3 bav70 r16 1k 0 0 c11 15pf 0 c30 10nf 0 0 c2 1 f tx1 0 0 c21 10nf r6 82k c8 10 f c25 1 f 0 0 0 0 c28 10nf d9 bav99 d7 bav99 d6 bav99 0 0 r9 9.1k 0 hot 1 cold 2 cn1 ccfl hot 1 cold 2 cn2 ccfl hot 1 cold 2 cn4 ccfl hot 1 cold 2 cn3 ccfl c22 220 f 25v olr c26 0.1 f 0 j1 0 rt olp d10 baw56 ref r14 100k outb d1 baw56 rt fb r1 330k ltm190ex sn gn sp gp dp dp dn dn m2 fds8958a c6 1 f 0 olp2 olp1 olp3 olp4 r12 1k r11 1k r26 1k ref r13 1k 0 0 0 0 r15 10k c9 1 f 0 f1 fuse c7 10 f 1 2 3 4 5 6 7 8 9 10 cn5 12505wr-10 r24 10k r27 10k r25 10k outa c10 15pf c14 10nf c12 15pf c29 10nf ic1 fan7314 s_s gnd ref olr ena bdim olp vin outa pgnd outb rt1 ct outc adim ea_in ea_out outd rt bct r22 10k r23 10k c19 2.2nf c20 2.2nf 0 0 0 0 r21 10k r20 10k c18 2.2nf c17 2.2nf 0 0 r7 0 r8 100k q1 kst2222 0 c15 10nf c27 1 f 0 0 r18 1k 0 sn gn sp gp dp dp dn dn m1 fds8958a 0 tx2 fb 0 c13 15pf 0 olp3 olp4 d11 baw56 0 r19 1k 0 olr on/off 13v dim(0~3.3v) 0 c4 4.7nf c5 220pf r5 27k 0 r2 56k r3 18k r4 22k 0 0 c3 4.7nf d4 bav70 c1 0.22 f d8 bav99 0 olp2 0 olr fb fan7314 rev. 02 fan7314 rev. 02
fan7314 ? lcd backli ght inverter drive ic ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7314 rev. 1.0.4 11 4. winding specification 5. bom of the application circuit pin no. wire turns inductance leakage inductance remarks 5 --> 2 1 uew 0.45 12 180h 7.2h 1khz, 1v 7 --> 9 1 uew 0.04 2430 (270*9) 7.2h 330mh 1khz, 1v part ref. value description /vendor part ref. value description /vendor fuse c5 220pf 50v 1608 j f1 24v 3a fuse c6 1f 50v 2012 k resistor (smd) c7 10f 16v 3216 r1 330k 1608 j c8 10f 16v 3216 r2 56k 1608 f c9 1f 16v 1608 k r3 18k 1608 f c10 15pf 3kv 3216 r4 22k 1608 f c11 15pf 3kv 3216 r5 27k 1608 f c12 15pf 3kv 3216 r6 82k 1608 f c13 15pf 3kv 3216 r8 100k 1608 f c14 10nf 50v 1608 k r9 9.1k 1608 f c15 10nf 50v 1608 k r11 1k 1608 f c17 2.2nf 50v 1608 z r12 1k 1608 f c18 2.2nf 50v 1608 z r13 1k 1608 f c19 2.2nf 50v 1608 z r14 100k 1608 f c20 2.2nf 50v 1608 z r15 10k 1608 f c21 10nf 50v 1608 z r16 1k 1608 f c25 1f 50v 2012 k r17 1k 1608 f c26 0.1f 16v 1608 k r18 1k 1608 f c27 1f 50v 2012 k r19 1k 1608 f c28 10nf 50v 1608 z r20 10k 1608 j c29 10nf 50v 1608 k r21 10k 1608 j c30 10nf 50v 1608 k r22 10k 1608 j diode / tr (smd) r23 10k 1608 j d1 baw56 fairchild semiconductor r24 10k 1608 j d3 bav70 fairchild semiconductor r25 10k 1608 j d4 bav70 fairchild semiconductor r26 1k 1608 f d6 bav99 fairchild semiconductor r27 10k 1608 j d7 bav99 fairchild semiconductor capacitor (smd) d8 bav99 fairchild semiconductor c1 0.22f 16v 1608 k d9 bav99 fairchild semiconductor c2 1f 50v 2012 k d10 baw56 fairchild semiconductor c3 4.7nf 50v 1608 k d11 baw56 fairchild semiconductor c4 4.7nf 50v 1608 k q1 kst2222 fairchild semiconductor
fan7314 ? lcd backli ght inverter drive ic ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7314 rev. 1.0.4 12 5. bom of the application circuit (continued) part ref. value description /vendor part ref. value description /vendor electrolytic capacitor wafer (smd) c22 220f 25v cn1 35001wr-02a mosfet (smd) cn2 35001wr-02a m1 fds8958a fairchild semiconductor cn3 35001wr-02a m2 fds8958a fairchild semiconductor cn4 35001wr-02a transformer (smd) cn5 12505wr-10 tx1 efd2124 supported by namyang electronics (http://www.namyangelec.co.kr) tx2 efd2124
fan7314 ? lcd backli ght inverter drive ic ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7314 rev. 1.0.4 13 mechanical dimensions figure 8. 20-lead molded small outline package(soic) january 2001, rev. a a .093 .104 2.35 2.65 symbol inches min. max. min. max. millimeters notes a1 .004 .012 0.10 0.30 .020 0.51 b .013 0.33 c .009 .013 0.23 0.32 e .291 .299 7.40 7.60 e .394 .419 10.00 10.65 .010 .029 0.25 0.75 h .050 bsc 1.27 bsc h l .016 .050 0.40 1.27 0 8 0 8 3 6 5 2 2 n20 20 ccc .004 0.10 d .496 .512 12.60 13.00 notes: 1. 2. 3. 4. 5. 6. dimensioning and tolerancing per ansi y14.5m-1982. "d" and "e" do not include mold flash. mold flash or protrusions shall not exceed .010 inch (0.25mm). "l" is the length of terminal for soldering to a substrate. terminal numbers are shown for reference only. "c" dimension does not include solder finish thickness. symbol "n" is the maximum number of terminals. 20 1 d a a1 C c C ccc c lead coplanarity seating plane e b l h x 45 c 11 10 eh
fan7314 ? lcd backlight inverter drive ic ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7314 rev. 1.0.4 14

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