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may 2011 ? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan7346 ? 1.0.0 fan7346 ? 4-channel led current balance controller fan7346 4-channel led current balance controller features ? linear balance control for 4-channel led arrays ? wide led string voltage range: ? 100v ? wide v cc voltage: 10.5v to 35v ? external linear regulation switch: mosfet or bjt ? internal voltage regulator for feedback ? monitoring drain-source voltage of external switch ? precision current accuracy trimmed to 1.5% ? supports external pwm dimming - positive ? supports wide dimming ratio: 0.5%~100% ? adaptive linear regulation method ? generate integrated feedback signal for primary controller (current feedback + pwm dimming) ? high efficiency by primary side direct feedback ? thermal shutdown (auto-recovery) ? over-voltage regulation ? channel individual open-led protection ? channel individual short-led protection ? channel individual over-current protection ? error flag output ? 28-pin soic applications ? led blu for lcd tv ? led blu for lcd monitor ? led lighting description the fan7346 is an led current-balance controller that controls 4-led arrays to maintain equal led current. the fan7346 has a high withstanding voltage, so is suitable for edge-type led blu and led lighting. to minimize components between primary to secondary, the fan7346 generates a new integrated feedback signal. the fan7346 provides various protections, such as over-voltage regulation, open-led protection, thermal protection, and drain-sour ce voltage protection of regulating switch (the fan7346 monitors all led arrays drain-source voltage for prot ection). to increase system reliability, fan7346 applies individual string protection. because fan7346 integrates so many functions it reduces overall bom costs. led brightness can be linearly varied up to led current by applying an external pulse width modulated (pwm) signal to the pwm pin. the fan7346 is available in a 28-soic package. ordering information part number operating temperature package packing method FAN7346M -40 to +125c 28-lead, small-out line integrated circuit (soic) rail FAN7346Mx tape & reel
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan7346 ? 1.0.0 2 fan7346 ? 4-channel led current balance controller block diagram figure 1. internal block diagram
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan7346 ? 1.0.0 3 fan7346 ? 4-channel led current balance controller pin configuration figure 2. package diagram pin definitions pin # name description 1 ovr this pin is input for over-voltage regulation. 2 fb this pin is for feedback of minimum drain volt age of external current regulation switch. this pin is externally connected to the ca thode of the feedback photo-coupler. 3 cmp this pin is for compensation of the minimum channel voltage feedback. 4 vmin synchronous signal of channel drain-voltage. if multiple controllers are operated, this pin must be tied together . in single operation, this pin must be open. 5 fo this pin is fault output. in case of olp, sl p, and ocp; this pin is connected to ground. 6 pwm4 pwm dimming signal input pin of channel 4. 7 pwm3 pwm dimming signal input pin of channel 3. 8 pwm2 pwm dimming signal input pin of channel 2. 9 pwm1 pwm dimming signal input pin of channel 1. 10 ena enable input. 11 adim this pin is for the reference voltag e of the led current feedback voltage. 12 slpr this pin is for setting the reference of channel over-voltage protection (short-led protection). 13 ref this pin is the reference output. volt age is 5v; current capability is 3ma. 14 vcc this pin is the supply vo ltage of the controller. 15 fb4 this pin is for current sensing feedback of channel 4. 16 vdd internal gate driver power supply voltage. a large capacitor (1f~2f) must be connected from this pin to ground. 17 out4 this pin is for gate signal to the external balance fet of channel 4. 18 ch4 this pin is for drain voltage of the external balance fet of channel 4. 19 fb3 this pin is for current sensing feedback of channel 3. 20 out3 this pin is for gate signal to the external balance fet of channel 3. 21 ch3 this pin is for drain voltage of the external balance fet of channel 3. 22 fb2 this pin is for current sensing feedback of channel 2. 23 out2 this pin is for gate signal to the external balance fet of channel 2. 24 ch2 this pin is for drain voltage of the external balance fet of channel 2. 25 fb1 this pin is for current sensing feedback of channel 1. 26 out1 this pin is for gate signal to the external balance fet of channel 1. 27 ch1 this pin is for drain voltage of the external balance fet of channel 1. 28 gnd this pin is the ground.
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan7346 ? 1.0.0 4 fan7346 ? 4-channel led current balance controller absolute maximum ratings stresses exceeding the absolute maximum ratings may damage the device. the devic e may not function or be operable above the recommended operating conditions and stressi ng the parts to these levels is not recommended. in addition, extended exposure to stresses above the recommend ed operating conditions may affect device reliability. the absolute maximum ratings are stress ratings only. symbol parameter min. max. unit v in ic supply voltage 10.5 35.0 v t a operating temperature range -40 +125 ? c t j operating junction temperature +150 ? c t stg storage temperature range -65 +150 ? c ja thermal resistance junction-air (1,2) 70 ? c/w p d power dissipation 1.4 w notes: 1. thermal resistance test board. size: 76.2mm x 114.3mm x 1.6mm (1s0p); jedec standard: jesd51-2, jesd51-3. 2. assume no ambient airflow. pin breakdown voltage pin # name value unit pin # name value unit 1 ovr 6 v 15 fb4 6 v 2 fb 6 16 vdd 17 3 cmp 6 17 out4 17 4 vmin 6 18 ch4 100 5 fo 6 19 fb3 6 6 pwm4 6 20 out3 17 7 pwm3 6 21 ch3 100 8 pwm2 6 22 fb2 6 9 pwm1 6 23 out2 17 10 ena 6 24 ch2 100 11 adim 6 25 fb1 6 12 slpr 6 26 out1 17 13 ref 6 27 ch1 100 14 vcc 35 28 gnd
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan7346 ? 1.0.0 5 fan7346 ? 4-channel led current balance controller electrical characteristics for typical values; t a = 25c, v in = 12v, and -25c ? t a ? 85c, unless otherwise specifi ed. specifications to -40c ~ 125c are guaranteed by design based on final characterization results. symbol parameter condition min. typ. max. unit under-voltage lockout section (uvlo) v th start threshold voltage 8.5 9.5 10.5 v v thhys start threshold voltage hy steresis 0.5 1.0 1.5 v i st startup current v in =8v 100 300 a i op operating supply current v in =12v, not switching 1 3 ma on/off section v on on-state input voltage 1.4 5.0 v v off off-stage input voltage 0.7 v r ena pull-down resistor 130 200 270 k ? reference section (recommend 1f x7r capacitor) v ref 5v regulation voltage i ref =0ma 4.9 5.0 5.1 v v r-line 5v line regulation 10 ? v in ? 35v 50 mv v r-load 5v load regulation 0 ? i ref ? 3ma 50 mv v dd 8.5v regulation voltage v in =12v 8.0 8.5 9.0 v led current section v fbx ch led current reference voltage v adim =2v 194 200 206 mv v lref led current reference voltage 0.5v ? v adim ? 4v v adim /10 v v adim-clamph adim voltage high clamping voltage v in =12v 3.84 4.00 4.16 v v adim-clampl adim voltage low clamping voltage v in =12v 0.45 0.50 0.55 b ch current balance between channels v adim =2v -1.5 1.5 % headroom voltage feedback section v fbr feedback reference voltage 0.95 1.00 1.05 v i leak channel leakage current pwm on, v ch =1v 0 100 a pwm off, v ch =30v 0 2 a a v open-loop gain (3) v vmin =1v 65 db g m error amplifier transconductance v vmin =1.5v 140 180 220 mho l sin output sink current v vmin =0v 70 120 170 a l sur output source current v vmin =2v 70 120 170 a continued on the following page?
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan7346 ? 1.0.0 6 fan7346 ? 4-channel led current balance controller electrical characteristics (continued) for typical values; t a = 25c, v in = 12v, and -25c ? t a ? 85c, unless otherwise specifi ed. specifications to -40c ~ 125c are guaranteed by design based on final characterization results. symbol parameter condition min. typ. max. unit pwm dimming section v bdim(on) pwm dimming on voltage 2 5 v v bdim(off) pwm dimming off voltage 0 0.8 v f bdim pwm dim input frequency range (3) on duty ratio=1% 100 500 hz t bdimr pwm dim on rising time (3) ext. switch q g =4.3nc 400 ns t bdimf pwm dim off falling time (3 ) ext. switch q g =4.3nc 150 ns soft-start section t ss soft-start time (3) v ovr =1v, i led : 0 to maximum 10 ms protection section v th,ovr ovr threshold voltage 1.35 1.42 1.49 v v th,ocp ocp threshold voltage 0.95 1.00 1.05 v t ocp ocp shutdown time (3) 10 s v th,slp slp threshold voltage v slpr =1v 9.5 10.0 10.5 v t d,slp slp delay (3) 20 s t d,olp olp delay (3) 20 s v th,olp olp threshold voltage 0.27 0.30 0.33 v t trip internal thermal protection threshold (3) 150 c t tyh internal thermal protection hysteresis (3) 25 c output section v gh nmos gate high voltage v in =12v 8.0 8.5 9.0 v v gl nmos gate low voltage v in =12v 0 v v g,uvlo nmos gate voltage with uvlo activated v in =7v 0.3 v i g,source nmos gate drive source current v in =12v 50 150 250 ma i g,sink nmos gate drive sink current v in =12v 300 500 700 ma note: 3. these parameters, although guaranteed, are not 100% tested in production.
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan7346 ? 1.0.0 7 fan7346 ? 4-channel led current balance controller typical performance characteristics figure 3. start threshold voltage vs. temperature figure 4. start threshold voltage hysteresis vs. temperature figure 5. startup current vs. temperature figure 6. operating current vs. temperature figure 7. enable threshold voltage vs. temperature figure 8. pull-down resistor vs. temperature 8 8.5 9 9.5 10 10.5 11 -50 -25 0 25 50 75 100 125 v th [v] temperature [ ( ] 0.4 0.6 0.8 1 1.2 1.4 1.6 -50 -25 0 25 50 75 100 125 v thhys [v] temperature [ ( ] 0 50 100 150 200 250 300 350 -50 -25 0 25 50 75 100 125 i st [a] temperature [ ( ] 0 0.5 1 1.5 2 2.5 3 3.5 -50 -25 0 25 50 75 100 125 i op [ma] temperature [ ( ] 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 -50 -25 0 25 50 75 100 125 v onth [v] temperature [ ( ] 100 150 200 250 300 -50 -25 0 25 50 75 100 125 r ena [k ? ] temperature [ ( ]
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan7346 ? 1.0.0 8 fan7346 ? 4-channel led current balance controller typical performance characteristics (continued) figure 9. 5v regulation voltage vs. temperature figure 10. 8.5v regulation voltage vs. temperature figure 11. offset of ch led current reference voltage vs. temperature figure 12. adim high clamping voltage vs. temperature figure 13. adim low clamping voltage vs. temperature figure 14. current balance between channels vs. temperature 4.85 4.9 4.95 5 5.05 5.1 5.15 -50 -25 0 25 50 75 100 125 v ref [v] temperature [ ( ] 7.8 8 8.2 8.4 8.6 8.8 9 9.2 -50 -25 0 25 50 75 100 125 v dd [v] temperature [ ( ] -8 -6 -4 -2 0 2 4 6 8 -50 -25 0 25 50 75 100 125 v ofs [mv] temperature [ ( ] 3.82 3.86 3.9 3.94 3.98 4.02 4.06 4.1 4.14 4.18 -50-25 0 255075100125 v adim-clamph [v] temperature [ ( ] 0.43 0.45 0.47 0.49 0.51 0.53 0.55 0.57 -50 -25 0 25 50 75 100 125 v adim-clampl [v] temperature [ ( ] -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 -50 -25 0 25 50 75 100 125 b ch [%] temperature [ ( ]
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan7346 ? 1.0.0 9 fan7346 ? 4-channel led current balance controller typical performance characteristics (continued) figure 15. feedback reference voltage vs. temperature figure 16. error amplifier transconductance vs. temperature figure 17. error amplifier output sink current vs. temperature figure 18. error amplifier output source current vs. temperature figure 19. pwm dimming on threshold voltage vs. temperature figure 20. ovr threshold voltage vs. temperature 0.94 0.96 0.98 1 1.02 1.04 1.06 -50 -25 0 25 50 75 100 125 v fbr [v] temperature [ ( ] 120 140 160 180 200 220 240 -50 -25 0 25 50 75 100 125 g m [mho] temperature [ ( ] 60 80 100 120 140 160 180 -50 -25 0 25 50 75 100 125 i sin [a] temperature [ ( ] 60 80 100 120 140 160 180 -50 -25 0 25 50 75 100 125 i sur [a] temperature [ ( ] 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 -50 -25 0 25 50 75 100 125 v bdim(th) [v] temperature, [ ( ] 1.34 1.36 1.38 1.4 1.42 1.44 1.46 1.48 1.5 -50-25 0 255075100125 v th,ovr [v] temperature, [ ( ]
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan7346 ? 1.0.0 10 fan7346 ? 4-channel led current balance controller typical performance characteristics (continued) figure 21. ocp threshold voltage vs. temperature figure 22. slp threshold voltage vs. temperature figure 23. olp threshold voltage vs. temperature figure 24. nmos gate high voltage vs. temperature figure 25. nmos gate drive source current vs. temperature figure 26. nmos gate drive sink current vs. temperature 0.9 0.95 1 1.05 1.1 -50 -25 0 25 50 75 100 125 v th,ocp [v] temperature [ ( ] 9.4 9.6 9.8 10 10.2 10.4 10.6 -50 -25 0 25 50 75 100 125 v th,slp [v] temperature [ ( ] 0.26 0.27 0.28 0.29 0.3 0.31 0.32 0.33 0.34 -50 -25 0 25 50 75 100 125 v th,olp [v] temperature [ ( ] 7.8 8 8.2 8.4 8.6 8.8 9 9.2 -50 -25 0 25 50 75 100 125 v gh [v] temperature [ ( ] 0 50 100 150 200 250 -50 -25 0 25 50 75 100 125 i g,source [ma] temperature [ ( ] 200 300 400 500 600 700 -50 -25 0 25 50 75 100 125 i g,sink [ma] temperature [ ( ]
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan7346 ? 1.0.0 11 fan7346 ? 4-channel led current balance controller functional description the fan7346 is a high-efficiency 4-channel led driver. it can drive a 4-channel led string with four external balance switches. it provides an integrated feedback for a dc-dc controller on the secondary side or on the flyback / llc controller of the primary side. due to the high withstanding voltage of the sensing pin for drain voltage of external switch, the fan7346 can be used in high-voltage led string operation without any clamping circuit. both mosfet and transistor can be used as external balance switch, so the fan7346 can drive a high-current led string. for four-string operation, the fan7346 supports four individual pwm signal input pins. the fan7346 can be operated by parallel connection mode. for a primary-side direct-power control system, the fan7346 supports an advanced power sequence and soft-start timing. led driving voltage can be set before led ignition for a reliable led backlight ignition. the fan7346 supports various and programmable protections; short-led pr otection (slp), open-led protection (olp), over-curr ent protection (ocp), and over-voltage regulation (ovr). except ocp, all protection are auto-recovery / auto-restart. except ovr, all protections are channel-individual protection. in case of slp, olp and ocp; even if some strings are in protection condition, other strings continues to operating for higher system reliability. figure 27 shows the work-flow of startup sequence. 1. startup when v cc voltage is higher than uvlo threshold voltage, internal 5v regulatio n output is operated. at the same time, feedback starts to control ovr voltage as 1v. if ovr voltage is lower than 1v, feedback is pulled up. if ovr voltage is higher than 1v, feedback is pulled down. after enable is applied, the fan7346 begins soft-start procedure. the fan7346 checks if ovr voltage is higher than 0.9v. if ovr voltage is lower than 0.9v, soft- start function is not started. if ovr voltage is higher than 0.9v, the fan7346 starts le d current balance and soft- start. the led current of each string is increased gradually for 10ms, which is fixed soft-start timing. during soft-start timing, slp and olp are disabled. figure 27. startup sequence 2. feedback after soft-start, the fan7346 starts feedback drain- voltage of external balance switch. drain voltage of each channel is sensed on the chx pin. chx means any of the ch1 / ch2 / ch3 / ch4 pins. minimum drain voltage is selected between four chx voltages. the fan7346 feeds back drain voltage to control minimum drain voltage at 1v. if minimum drain voltage is higher than 1v, fb is pulled low. if minimum drain voltage is lower than 1v, fb is pulled high. feedback response can be controlled by adding a resistor and capacitor to the cmp pin. 3. analog dimming in the fan7346, led current can be modified by changing adim voltage. led current is controlled by the fbx pin voltage. fbx means any of the fb1 / fb2 / fb3 / fb4 pins. external current balance switch is operating in the saturation region to control led curren t. sensed voltage on the fbx pin is compared with internal reference voltage and the controller supplies a gate / base signal for the external current balance switch. internal reference voltage is decided by adim voltage. the formula for led current calculation is: s e n s e a d i m l e d r 1 0 v i ? ? (1) adim voltage is clamped internally from 0.5v to 4v. if adim voltage is lower than 0.5v, it is clamped as 0.5v. if adim voltage is higher than 4v, it is clamped as 4v.
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan7346 ? 1.0.0 12 fan7346 ? 4-channel led current balance controller 4. pwm dimming the fan7346 has four pwm dimming signal pins. each pwm dimming pin controls an led string. if pwm dimming voltage is higher than 2v, an external balance switch is turned on and conducts constant current operation. if pwm dimming voltage is lower than 0.8v, an external balance switch is turned off and blocks led current. during pwm dimming off, open-led protection and short-led protection is disabled. chx drain voltage is sampled during pwm dimming on and held during pwm dimming off to maintain drain voltage regardless of dimming on/off signal. 5. short-led protection (slp) to sense a short-led condition, the fan7346 uses the drain voltage of external balance switch. if some leds are shorted, its led forward voltage is lower than other led strings, so the drain volt age of the external balance switch is higher than other drain voltage. slp threshold voltage can be programmed by slpr (short-led protection reference) voltage. internal slp threshold voltage is calculated as: s l p r s l p t h v * 1 0 v ? (2) minimum slp threshold voltage is 0v and maximum slp threshold voltage is 45v. slp is a channel-individual protection. if any string is in slp condition, the slp strings is turned off and other string operate normally. if the sensed-drain voltage (chx voltage) is higher than the programmed threshold voltage for 20s, chx goes into short-led protection, which forces the corresponding channel to turn off. to increa se reliability, the slp channel is restarted in the next pwm dimming signal rising timing. after restarting, the fan7346 checks the drain voltage. if the drain voltage is higher than the slp threshold voltage for 20s, the switch is turned off. if drain voltage is lower, the channel is restored to normal operation. shorted led channel operation is minimum duty pwm dimming with a 20s dimming on period. during 100% full duty pwm dimming, auto restart is not activated. figure 28 shows the slp operation. as soon as slpr*10 (blue line) is lower than chx voltage, chx is forced into minimum duty dimming operation. figure 28. short-led protection operation 6. open led protection (olp) to sensing open-led condit ion, the fan7346 use the drain voltage of an external balance switch. if an led string is open, the drain vo ltage of external balance switch is grounded, and the fan7346 can detect open- led condition. olp threshold voltage is 0.3v. if chx voltage is lower than 0.3v for 20s, its drain- voltage feedback is pulled up to 5v. this means the open led string is eliminated from minimum drain voltage feedback loop. without olp, if minimum drain voltage is 0v, drain voltage feedback forces the fb signal to increase output power. this can cause slp or thermal stress in other channels. olp is an auto-recovery protection. as soon as drain voltage is higher than 0.3v, olp is finished and the drain voltage feedback system is restored. figure 29 shows the olp operation. before open ch2, ch2 is the headroom channel. (ch2 drain voltage is minimum voltage ? 1v.) as soon as open ch2, its drain voltage is 0v, olp is activated, and ch2 is removed from headroom feedback control loop. ch1 is selected as minimum drain voltage channel, so its drain voltage is controlled as 1v. reconnec ting ch2 string, restores normal operation. figure 29. open-led protection operation chx volta g e led current out p ut slpr ch2 led c urrent out p ut ch1 drain volta g e ch2 drain volta g e normal slp ch2 open
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan7346 ? 1.0.0 13 fan7346 ? 4-channel led current balance controller 7. over-voltage regulation (ovr) to prevent led driving vo ltage from exceeding the withstanding voltage of system components, the fan7346 controls led driving voltage with ovr pin voltage. the fan7346 sens es output led driving voltage through the ovr pin voltage. resistor divided output voltage is applied to the ovr pin voltage. in fan7346, ovr voltage us es two kinds of feedback and control: and regulating output voltage during enable off and clamping output voltage during enable on. when ena pin is low, the fa n7346 controls fb voltage to maintain ovr voltage as 1.0v. through this output voltage control during en a off, the fan7346 reaches adequate led driving voltage before turning ena on. after ena pin is high, ovr pin voltage is used for over- voltage regulation. if ovr pin voltage is lower than 1.42v, the fb pin voltage follows headroom control to maintain minimum voltage of drain voltages as 1v. if ovr pin voltage is higher than 1.42v, the fan7346 controls fb (fb is pulled low). through feedback regulation, ovr pin voltage cannot exceed 1.42v. 8. over-current protection (ocp) through over-current prot ection, the fan7346 can protect external balance sw itches from shorted over- current damage. to sense over-current condition, the fan7346 monitors fbx (fb1~fb4) pin voltage. if fbx voltage is higher than 1v for 20s, chx is considered an over-current condition. after sensing ocp condition, chx dimming switch is turned off. ocp is channel individual and latched protection. if one channel is in ocp condition, other channels keep operating. ocp channel is restarted after uvol is reset. 9. error flag (fo) to make error flag signal, the fan7346 uses the fo pin. fo pin is open-drain type. during normal operation, the fo pin is open. if using an external pull-up resistor , this signal is high. if used olp / ocp / slp protection, the fo pin is connected to ground. if using an external pull-up resistor, this signal is low. if a single channel is in protection condition, error-flag signal is detected. only if all channels are operating normally is the fo pin pulled high.
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan7346 ? 1.0.0 14 fan7346 ? 4-channel led current balance controller short lamp protection figure 30. block diagram of short led protection figure 31. timing diagram of short led protection
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan7346 ? 1.0.0 15 fan7346 ? 4-channel led current balance controller typical application circuit (backlight) application device input voltage range led string 32~46 inch led tv fan7346 380v 8-string / 90v / 100ma figure 32. lcd backlight driver 0 cn5 con3 1 2 3 q5 fqt4n25 c6 1n r8 10k fan7621 u1 fan7621 16-soic 1.hvcc 2.ctr 3.ho 6.con 8.rt 9.cs 10.sg 12.lvcc 14.lo 16.pg c34 open c22 1n q7 fqt4n25 r107 3.3r r105 4.7k r10 100k r14 22r r7 1k r18 open r114 10k c202 100uf/200v q3 fqt4n25 c11 1u q4 fqt4n25 r1 1m r55 0r c112 680pf/50v r12 open r9 10k u2a pc817a 1 2 d102 lmbd914 r13 open d212 fep16jt r3 100k r720r u4 2n2222 r53 3.9r r58 0r r57 3.9r q2 fqt4n25 c10 1n r2 12k c37 open c19 1n r6 open r32 0r r26100k cn6 con3 1 2 3 r17 1k r37 0r q1 fqt4n25 r28 open d211 fep16jt c109 25v/47uf r38 0r r25 10k r710r c106 2a224k d101 uf4007 zd101 6.8v/1n4736 fan7346 ic3 fan7346 28-soic ovr fb cmp vmin fo pwm4 pwm3 pwm2 ch3 fb2 out2 ch2 fb1 out1 ch1 gnd pwm1 ena adim slpr ref vcc out3 fb3 ch4 out4 vdd fb4 c103 100pf/50v r110 1m r109 10k r108 3.3r q8 fqt4n25 r23 open c33 open cn3 con10 1 2 3 4 5 6 7 8 9 10 m1 01 fdd5n50f r104 910r r24 open r31 0r f2 fuse r107 1.8k zd102 open sod-123 c2 10n r113 390k u2b pc817a 4 3 c31 open r5 open tm103 eer39hs-16 1 2 3 4 5 6 7 11 10 9 8 12 c36 open r112 10k r55 3.9r r54 3.9r r11 10k c105 0.33uf/25v c16 1u r52 3.9r r106 10r c38 open r101 0.1r/1w q6 fqt4n25 r51 3.9r u5 2n2907 c3 open c107 16v / 33uf r109 1m d101 lmbd914 c13 22uf/50v c35 open c1 10n m1 02 fdd5n50f c108 12nf/100v r56 0r c20 1u c102 mpe630v223j r110 10k r27 10k r4 10k c14 1u c12 1u r102 1k r57 0r r56 3.9r c4 10n r58 3.9r c101 220uf/450v fan7346 ic2 fan7346 28-soic ovr fb cmp vmin fo pwm4 pwm3 pwm2 ch3 fb2 out2 ch2 fb1 out1 ch1 gnd pwm1 ena adim slpr ref vcc out3 fb3 ch4 out4 vdd fb4 c32 open r19 0r cn6 con10 1 2 3 4 5 6 7 8 9 10 r111 47k pwm3 pwm4 pwm1 pwm2 ena ena vcc2 vcc2 ena pwm5 pwm8 v cc2 pwm6 pwm7 vcc1 pfc_out(380vdc) pwm2 pwm1 pwm4 pwm3 pwm6 pwm5 pwm8 pwm7 ref1 ref1 ref1 ref2 ref2 ref2 0 ref1 0 0 5v fsfr2100 c201 100uf/200v c203 100uf/200v vc c 1
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan7346 ? 1.0.0 16 fan7346 ? 4-channel led current balance controller typical application circuit (lighting) (continued) application device input voltage range led string led lighting fan7346 380v 4-string sg pg c116 lv cc rt ar cs vctr hv cc vdl fls-xs series r203 d203 rs12 cs14 v cc ovr v dd ref ena fo slpr adim fb vmin cmp pwm4 pwm3 pwm2 pwm1 gnd ch1 out1 fb1 ch2 out2 fb2 ch3 out3 fb3 ch4 out4 fb4 v aux rs19 cs15 rs27 rs14 cs12 cs16 rs15 rs17 rs18 rs22 rs13 cs9 cs8 c205 c206 c204 c201 d202 d201 rs8 cs6 rs10 rs32 rs31 rs23 rs30 rs16 rs29 rs11 cs7 cs10 cs11 cs13 cs17 fault d107 r128 c115 r130 r131 r132 q104 q103 u201 d204 c123 c124 d109 r133 pc101 r136 r135 r134 c114 c125 c127 r126 r127 r202 c202 c203 v led q1 q2 q3 q4 u102 rs20 rs28 rs21 rs24 r129 r201 c126 tm2 r123 pc101 rs25 ic1 figure 33. led lighting driver
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan7346 ? 1.0.0 17 fan7346 ? 4-channel led current balance controller typical application circuit (continued) figure 34. multiple controller driving
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan7346 ? 1.0.0 18 fan7346 ? 4-channel led current balance controller physical dimensions figure 35. 28-lead, small-outline integrated circui t (soic), jedec ms-013, 0.300-inch, wide body package drawings are provided as a service to customers consi dering fairchild components. drawings may change in any manner without notice. please note the revision and/or date on the drawi ng and contact a fairchild semiconductor representative to ver ify or obtain the most recent revision. package specifications do not expand the terms of fairchild?s worldwide terms and conditions, specifically the warranty therein, which covers fairchild products. always visit fairchild semiconductor?s online packa ging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan7346 ? 1.0.0 19 fan7346 ? 4-channel led current balance controller

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