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rev. 1.00 1 november 07, 2011 rev. 1.00 pb november 07, 2011 HT7A4016 low power, wide temperature range general purpose current mode pwm controller feature ? high performance, low cost current mode pwm controller especially designed for energy star 2.0 ? very low startup current (<20a) and operating current ? high-voltage cmos process with excellent esd protection (>3kv) ? 5% t rimmed oscillator for precise frequency control ? leb (leading-edge blanking) on cs pin ? internal slope compensation ? programmable switching frequency ? internally t rimmed reference with uvlo (under voltage lockout) ? cycle-by-cycle current limiting applications ? switching ac-dc adaptors ? dc-dc switching buck/boost converters ? led backlights for lcd/led tvs general description the ht 7a4016 i s a c ontroller ic t hat i ncludes t he necessary features to implement of f-line or dc-d c current mode control schemes with a minimal external parts count. internal circuits include a specially designed m ixed-mode/analog interface for multi- function and multi-topology control schemes (dc-dc buck/boost, of f-line ac-dc), a trimmed oscillator for precise duty-cycle control under voltage lockout with a start-up current of less than 0.5ma, a wide temperature range, precise voltage reference, internal slope com pensation and l eading-edge bl anking. the HT7A4016 features basic system protection functions such as cycle-by-cycle current limiting and under v oltage lock-out (uvlo). a multi-function pin can be used as a dimming function for led driving, and as a primary feedback control for pri mary-side fee dback ac-dc applications. application circuits gd vcc mf cs comp / fb gnd rt vref 2.2k 0.1 uf 470uf / 50v 10 1n 4148 20 0. 22 10 k irf 540 0. 22 1 nf 470 k 33pf hfb 20 hj 20 c 0.1 uf / 100 v 46uh 2k 40 k 470uf / 63 v 820 220pf vo = 55 v/ 75w v in = 24v
rev. 1.00 2 november 07, 2011 HT7A4016 block diagram pin assignment 32 v uvlo 14 v / 8v internal bias & vref trimmed osc ocp output leb 350ns s r q driver stage vref vcc gd gnd vcc rt comp / fb cs mf ocp level = 1v fb compare level = 2.5v slope compensation 3 6 7 2 1 4 5 mixed - mode / analog interface pin description pin no. pin name description 1 comp/fb voltage feedback pin, connected to a system voltage feedback point. 2 mf multi-function pin. by connecting this pin to different system sensing points, the device can be used for different circuit topologies such as isolation flyback or non-isolation dc- dc buck/boost. 3 cs a voltage proportional to the inductor current is connected to this input. the pwm generator uses this voltage to terminate output switching. 4 rt the oscillator frequency is programmed by connecting a resistor, rt, between this pin and ground. a maximum frequency of 500khz is possible. 5 gnd combined control circuitry and power ground. 6 gd power mosfet gate driver output. 7 vcc positive supply. 8 vref temperature-independent voltage reference output. absolute maximum ratings supply v oltage vcc ................................................................................................................................ -0.3v~30.0v comp/fb, rt, cs, mf pins ..................................................................................................................... -0.3v~5.0v junction t emperature .......................................................................................................................................... 150c operating ambient t emperature ............................................................................................................... -40c~85c storage t emperature range .................................................................................................................... -65c~150c package thermal resistance (8-pin sop) ..................................................................................................... 160c/w esd protection: human body model ......................................................... .............................................................................. 3kv machine model ......................................................... ................................................................................... 200v note: these are stress ratings only . stresses exceeding the range specifed under absolute maximum ratings may cause substantial damage to the device. functional operation of this device at other conditions beyond those l isted i n t he sp ecifcation i s n ot i mplied a nd p rolonged e xposure t o e xtreme c onditions m ay a ffect device reliability.

rev. 1.00 3 november 07, 2011 HT7A4016 electrical characteristics unless otherwise stated, this specifcations apply for 0c ta 70c, v cc =15v, rt=10k w symbol parameter test condition min. typ. max. unit supply voltage (vcc pin) i st startup current v cc =7.7v 12 30 m a i cc operating current v fb =v cs =0v 2.0 3.0 ma v tl uvlo (off) 7.0 7.6 8.2 v v th uvlo (on) 7.8 8.4 9.0 v reference section v ref output voltage tj = 25c, i o = 1ma 4.85 5.00 5.15 v ?v ref line regulation 12v v cc 25v 3 20 mv ?v ref load regulation 1ma i o 10ma 4 25 mv current sensing (cs pin) v cs(off) maximum input voltage 0.9 1.0 1.1 v t leb leading edge blanking time 350 ns delay to output 100 ns oscillator (rt pin) f osc oscillator frequency tj=25c, rt=10k w 47 52 57 khz ?f osc ?t a tempurature stability -40c ~105c 5 % ?f osc ?v ref voltage stability v cc =10v~25v 0.2 1.0 % d max maximum duty 97 % gate drive output (gd pin) v ol output low level v cc =15v, isink=20ma 1 v v oh output high level v cc =15v, isource=20ma 9 v t r rising time tj=25c, load capacitance=1nf 50 150 ns t f falling time tj=25c, load capacitance=1nf 50 150 ns voltage feedback (comp pin) v comp open loop voltage comp pin open 5 v scp (short circuit protection) v refa reference voltage v fb/pdm =2.5v 2.42 2.50 2.58 v i sinka output sink current v fb =2.7v, v fb/pdm =1.1v 2 7 ma i sourcea output source current v fb =2.3v, v fb/pdm =4.8v -0.5 -1.0 ma v oha v fb/pdm high voltage v fb =2.3v, rl=15k w to gnd 4.8 5.0 v v ola v fb/pdm low voltage v fb =2.7v, rl=15k w to vref 0.8 1.1 v a vo dc gain 150 db 1rwh 7khvh 3dudphwhuv dowkrxjk jxdudqwhhg duh qrw whvwhg lq surgxfwlrq
rev. 1.00 4 november 07, 2011 HT7A4016 typical performance characteristics 11 .5 12 12 .5 13 13 .5 14 14 .5 15 15 .5 - 40 - 20 0 20 40 60 80 100 120 temperature ( degree c ) uvlo (on)(v) figure 1. uvlo (on) (v) vs. temperature 47 48 49 50 51 52 53 54 55 56 57 - 40 - 20 0 20 40 60 80 100 120 temperature ( degree c ) frequency (khz) figure 3. frequency vs. temperature 6 6.5 7 7.5 8 8.5 9 9.5 10 - 40 10 60 110 temperature ( degree c ) uvlo (off)(v) figure 2. uvlo (off)(v) vs. temperature 47 48 49 50 51 52 53 54 55 56 57 11 13 15 17 19 21 23 25 vcc (v) frequency (khz) figure 4. frequency vs. vcc
rev. 1.00 5 november 07, 2011 HT7A4016 application information operation overview the HT7A4016 is a low power , wide temperature range general purpose current mode pwm controller . the device is designed to require a minimum of external components for dif ferent power circuit topologies such as primary-side feedback flyback and dc-dc buck/boost. the device can be used for led driving applications such as led backlights and led lighting. t o meet led constant current requirements, t he d evice c an m aintain a l ow c urrent tolerance of 1% for led driving applications. under voltage lockout (uvlo) a uvl o c omparator i s p rovided t o e nsure t hat t he device is fully functional before the output stage is enabled. as shown in figure 5, hysteresis is provided to prevent t he pw m cont roller from shutt ing down during any voltage dips which might occur during the startup process. the turn-on and turn-of f threshold levels are set at 16.0v and 10.0v, respectively. figure 5 uvlo scheme and start-up current current sense and leading-edge blanking (leb) for is olation f lyback applications , a leading- edge bl anking sc heme i s ne cessary. a l eading- edge blanking scheme is integrated in the device to prevent f alse t riggering d ue t o f eedback c urrent sp ikes which may appear on the cs pin. this eliminates the need for the usual r-c flter which is normally a requirement in typical current mode pwm controller applications. figure 6 leb with r-c filter removed internal slope-compensation an i mportant i ssue wi th c urrent m ode c ontrol schemes is instability due to sub-harmonic oscillation when the duty-cycle > 50%. t o prevent this problem from occurring, a slope-compensation function is always necessary . in traditional current mode controller applications, many external components are necessary to implement a slope-compensation function. ho wever i n t he ht 7a4016 t he i nternal slope-compensation function eliminates the need for these exte rnal components resulting in a simplified application circuit design. os oscillator frequency tuning by choosing an appropriate value of external resistor between t he r t pi n a nd gnd, a sui table op erating frequency can be generated. the relationship between the r t value and the operating frequency is provided in figure 7. figure 7 rt resistor value vs. operating frequency
rev. 1.00 6 november 07, 2011 HT7A4016 gd vcc mf cs comp / fb gnd rt vref 2.2k 0.1 uf 470uf / 50v 10 1n 4148 20 0. 22 10 k irf 540 0. 22 1 nf 470 k 33pf hfb 20 hj 20 c 0.1 uf / 100 v 46uh 2k 40 k 470uf / 63 v 820 220pf vo = 55 v/ 75w v in = 24v figure 8 constant voltage boost application (dc-dc boost) multi-function pin a specially designed mixed-signal/analog interface is provided in the HT7A4016. by connecting the multi-function (mf) pin to dif ferent system sensing points, the HT7A4016 can be used for different circuit topologies such as isolation flyback or non-isolation dc-dc buck/boost. the mf pin can also be used as an l ed di mming pi n for buc k l ed dri ving. so me application c ircuit e xamples a re i ntroduced i n t he following pages. constant voltage boost application a constant v oltage (cv) boost application circuit is show n in figure 8. this circuit can be used with dc inputs of 16~24v and provides a dc output of 55v 5% with an output power level of 60~70w . the output power level can be changed by choosing a suitable inductor value and power mosfet , while the output voltage can be changed by choosing a suitable feedback resistor ratio. boost constant current (cc) led driver for back-light a boost cc led driver shown in figure 9 is designed for led backlight applications. the topology is similar to boost topologies, but the feedback point is changed from the v oltage output terminal to the current sense resistor . this circuit can be used with a dc input of 16~24v , for a dc output o f 5 5v a nd o utput p ower l evel o f 6 0~70w a t an output current level of 380ma 1% (16s10p). this circ uits constant current capa bility is more than that required by backlights and also good enough for led lighting applications. buck constant current led lighting driver a low cost buck constant current led lighting driver i s i ntroduced i n fi gure 10. unl ike t he usua l led drives which have a fi xed-voltage range and constant current control, this circui t can support very high out put vol tages, pe rhaps for hi gh l ed c ount serial configurations, with no maximum voltage limitations. here the mf pin can be used as a pwm dimming pin. constant voltage buck application a constant v oltage (cv ) buck (h igh-side buck) application circuit is shown in figure 1 1. this circuit can be used with dc inputs of 24v or higher voltage and p rovides a c onstant dc v oltage o utput. t he output power level can be changed by choosing a suitable inductor value, t ransformers turn ratio and power mosfet , while the output voltage can be changed by c hoosing a su itable fe edback re sistor ratio. primary side feedback, isolation flyback ac-dc converter the device can also can be used for isolation ac- dc appli cations. a typic al pri mary si de feedback, isolation flyback ac-dc converter is shown in figure 12.
rev. 1.00 7 november 07, 2011 HT7A4016 gd vcc mf cs comp / fb gnd rt vref 2.2k 0.1 uf 470uf / 50v 10 1n 4148 20 0. 22 10 k irf 540 0. 22 1 nf 470 k 33pf hfb 20 hj 20 c 0.1 uf / 100 v 46uh 470uf / 63 v 820 220pf vo = 55 v/ 75w v in = 24v rs output channels figure 9 dc-dc boost constant current (cc) led driver for back-light gd vcc mf cs comp / fb gnd rt vref v in 470uf / 50 v dimming rt rs c1 q1 d1 l1 figure 10 buck constant current led lighting driver
rev. 1.00 8 november 07, 2011 HT7A4016 15 10 k 1n 4148 1n 4148 1 uf 10 100uf 1n 4148 1 nf 200 10 k 5.1k mbr 160 220uf 47uh 5.1k 5.1k vout /5 vdc 56pf 1k 0.1 uf 0.1 uf 10nf 2.2k 1m 2 sk 941 v in = 24vdc 1 : 30 1 : 0.8 gd vcc mf cs comp / fb gnd rt vref figure 11 constant voltage buck regulator (high-side buck) f1 l1:a l2:a r3 r7 r8 d4 d3 r4 r 19 c 12 gd vcc mf cs comp / fb gnd rt vref r 11 c 15 d1 c3 r5 vout c 14 t1 q1 c 11 u1 c1 c2 bd 1 vac = 90 v ~ 265 v l n r1 r2 1 5 4 3 7 8 c4 c 13 r 21 r 22 r 23 figure 12 primary side feedback, isolation flyback ac-dc converter
rev. 1.00 9 november 07, 2011 HT7A4016 package information note that the package information provided here is for consultation purposes only . as this information may be updated at regular intervals users are reminded to consult the holtek website (http://www.holtek.com.tw/english/ literature/package.pdf) for the latest version of the package information. 8-pin sop (150mil) outline dimensions ms-012 symbol dimensions in inch min. nom. max. a 0.228 D 0.244 b 0.150 D 0.157 c 0.012 D 0.020 c' 0.188 D 0.197 d D D 0.069 e D 0.050 D f 0.004 D 0.010 g 0.016 D 0.050 h 0.007 D 0.010 0 D 8 symbol dimensions in mm min. nom. max. a 5.79 D 6.20 b 3.81 D 3.99 c 0.30 D 0.51 c' 4.78 D 5.00 d D D 1.75 e D 1.27 D f 0.10 D 0.25 g 0.41 D 1.27 h 0.18 D 0.25 0 D 8
rev. 1.00 10 november 07, 2011 HT7A4016 reel dimensions sop 8n (150mil) symbol description dimensions in mm a reel outer diameter 330.01.0 b reel inner diameter 100.01.5 c spindle hole diameter 13.0 +0.5/-0.2 d key slit width 2.00.5 t1 space between flange 12.8 +0.3/-0.2 t2 reel thickness 18.20.2
rev. 1.00 11 november 07, 2011 HT7A4016 carrier tape dimensions

sop 8n (150mil) symbol description dimensions in mm w carrier tape width 12.0 +0.3/-0.1 p cavity pitch 8.00.1 e perforation position 1.750.10 f cavity to perforation (width direction) 5.50.1 d perforation diameter 1.550.1 d1 cavity hole diameter 1.50 +0.25/-0.00 p0 perforation pitch 4.00.1 p1 cavity to perforation (length direction) 2.00.1 a0 cavity length 6.40.1 b0 cavity width 5.20.1 k0 cavity depth 2.10.1 t carrier tape thickness 0.300.05 c cover tape width 9.30.1
rev. 1.00 12 november 07, 2011 HT7A4016 holtek semiconductor inc. (headquarters) no.3, creation rd. ii, science park, hsinchu, taiwan tel: 886-3-563-1999 fax: 886-3-563-1189 http://www.holtek.com.tw holtek semiconductor inc. (taipei sales offce) 4f-2, no. 3-2, yuanqu st., nankang software park, taipei 115, taiwan tel: 886-2-2655-7070 fax: 886-2-2655-7373 fax: 886-2-2655-7383 (international sales hotline) holtek semiconductor inc. (shenzhen sales offce) 5f, unit a, productivity building, no.5 gaoxin m 2nd road, nanshan district, shenzhen, china 518057 tel: 86-755-8616-9908, 86-755-8616-9308 fax: 86-755-8616-9722 holtek semiconductor (usa), inc. (north america sales offce) 46729 fremont blvd., fremont, ca 94538, usa tel: 1-510-252-9880 fax: 1-510-252-9885 http://www.holtek.com copyright ? 2011 by holtek semiconductor inc. the information appearing in this data sheet is believed to be accurate at the time of publication. however, holtek assumes no responsibility arising from the use of the specifications described. the applications mentioned herein are used solely for the purpose of illustration and holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. holtek's products are not authorized for use as critical components in life support devices or systems. holtek reserves the right to alter its products without prior notifcation. for the most up-to-date information, please visit our web site at http://www.holtek.com.tw.

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