led SM8207 C?????leds l??s>0.95 (85vac?265vac) O? (5ua ?) ????? ??ii(uvlo) off-time??pdr ???o(s.c.p)K??t ??^?o(o.v.p)K??t v???o(o.t.p)K??t |gC ic_^o ?led?y t8t5 e27 ? www.samhop.com.tw 1 rev. 1.1 @ 2013/03 SM8207?w?ledic,? ??Vac??85vac?264vac,x ???????s???p ?O?. SM8207?]M????C ?,?_?led?x?? ????h?K{???s.s xC1??w(power mosfet)? ?_?,?w K?????M?.SM8207 ??0ff-timec??xp?d r,?|???(power mosfet)o_???r? S]. ??SM8207??N??oC ,C?Mx\^????^, : ?ii(uvlo)?^?o, v ???o(o.t.p), ledo(s.c.p), led_ o(o.v.p)K??tC. SM8207? sop-8???b. vin zcd gate comp cs bridge rectifier d1 vac rcs r3 cin SM8207 gnd ? l1 cout r1 r2 d2 q1 c1 c2 fuse vcc c3
SM8207 1 2 3 6 7 8 zcd gnd vin cs gate vcc sop-8 (?) 1 zcd 23 4 6 vcc K?4.7uf, low-esrp?ic?w. Ho ic???,????U?d . 7 ?^???zK?,zK?zK? ?_r(?),???power mosfet`??, ?mosfet . 8 gate cs ?power mosfet?Oc??g?zK?? ,M_?C. ???n power mosfet. ??bmosfet lO???K^?emi. ?uvloVi?r?S x?. comp vin 5 A?C?oUx . part number marking SM8207sl xxxxxx SM8207sl packing method tape & reel 2 www.samhop.com.tw rev. 1.1 @ 2013/03 gnd ??c, ??. note: the letter s is marked for sop package, and letter l is marked for lead free parts. 4 5 comp n.c _??^?o??. n.c []f]: icw gnd pin)c???w?j,ff??x?,tSv. ?????wa???.
SM8207 vcc, comp, zcd, cs to gnd vin to gnd vv v 48 0.3 to 5.5 gate to gnd 22 ???? 150 junction to ambient ( ja ) 102 / w ?? 40 ? +125 ?? 55 ? +150 _? (a,10sec) 260 min units vin ( ??) 10 v max 18 f sw (l) 70 khz t a (h?) 20 85 parameter symbol min typ max units test conditions K?l: v in =18v, c vcc =c vin =10uf, c comp =0.1uf, t a =25 ,?],tK?l? . vin pin) v in_on turnon threshold voltage 15 14 v v cs =0 uvlo hysteresis 6 v (internal regulator) 13 v cc internal regulated voltage for bias supply 5.00 4.85 5.15 v v cc pin connected a 10uf capacitor to gnd, i cc =0. 3 www.samhop.com.tw rev. 1.1 @ 2013/03 []f]: ??^~?,?Sv???. v in_off turnoff threshold voltage 8 7 9 v v in_hys v in_ovp input voltage overvoltage threshold 26 24 22 v i st start current ?, v in =10v 5 10 ua i op operating current v cs =0 1.4 ma 1.6 1.2 v cc (load) load regulation of the v cc voltage 0 15 mv i cc =0 ? 5ma
SM8207 parameter symbol min typ max units test conditions t rise gate driver output rise time 50 61 70 us t fall gate driver output fall time 620 ns t leb leading edge blanking time 400 ns c l =1000pf, from 0% to 100% (gate driver) c l =1000pf, from 100% to 0% (current sense) (zero current detection) v zcdup v zcddn v zcd = increasing v zcd = decreasing zcd up latching threshold voltage zcd down triggering threshold voltage 1.5 1.6 1.4 1.0 vv 1.1 0.9 v cs = 0 v 2.65 v 2.8 2.5 (thermal protection) t sd thermal shutdown temperature 140 t hys thermal shutdown hysteresis 40 4 www.samhop.com.tw rev. 1.1 @ 2013/03 (error amplifier) v ref reference voltage for noninverting input mv 314 []1] 324 v o (max) v comp output voltage range 0.3 v 4.90 v cc =5.0v a v open loop gain 64 db output open g m transconductance 480 ua/v ocp over current protection threshold over current protection release threshold ? cs _K? 1.0 v mv 0.9 1.1 300 285 315 cs _?rg 75 ns 90 65 75 ns (osc) t st start up period v cs =400mv t on _ min minimum on time r zcd zcd pin pulldown resistance 12 10 14 k v zcdovp zcd pin overvoltage protection threshold t zcdblk blanking time for ovp detection of zcd pin 1.2 1.6 2.0 us []1]: ?]^HK?,?O?Co. []1] K?l: v in =18v, c vcc =c vin =10uf, c comp =0.1uf, t a =25 ,?],tK?l? . 304
SM8207 en r s q ldo over voltage protection en gate gnd cs comp zcd vcc vin 5 www.samhop.com.tw rev. 1.1 @ 2013/03 12k 1.5v 1.0v rs q 314mv zerocurrent detector under voltage lockout thermal shutdown + -+ - osc + leb ocp ovp + sawtooth waveform scale down minmum offtime D1: ?KD
SM8207 SM8207?w^?K????led ,T??led?O? ,????C? {???K?????. ?Bm?cBm??g,w \??????s?, ????D?(?KD)?D( 1). acK?????? ?SM8207(?5ua),?? ,sB?^??? ??v in _?g,? ?p,?. |g;c2? ??^r2,r3r4?v in _14v? . SM8207??iit^,c Pi??eO14v8v. @t?? sac??g????l,D2 ???D. (uvlo) 14v 8v vin t off on off gate D2: uvlo?D D,SM8207lO?? ?power mosfet(q1),?v comp f, a_?(comp)c?a?Krq1 P,?r???? ??`?ov in _Bm\,? ic??. (zcd) ?r,mosfet(q1)x?Pir?? (l1)???_P,q1?zcd ????,q1Pirzcd_? ? a . ? ? ^ 1 . 5 v , z c d t s 1.6us(D3E)?rgO?lO ?`??,????. 1.6us?rg??a?g Bs??zKl`O?. x?r g^,zcd`zK1.0v?,Nl O?`?q1,?\L? m . q 1 ? r g x ? (constant on-time))m?ac???? ?,@comp_?n ???s?_??s. v zcd 0v ?c t zcd_blk =1.6us D3: zcdtzKrgD (cs) (t leb ) ?q1?r,?as ?,?_?_?zK?,SM8207AO400ns? rg??_?l`??_z K?.xr8Q^led. c?314mv??^,led ????: i led v ref r cs = = 314mv r 8 ( ) (1) (vin) ?oled?p,SM8207xv in _O ?^?o. v in ?^?o O?24vr,lO???P,Mq1P i. v in ^?o???o,? l^o,??v in ? uvlo??(s8v),???oC, M????. (chip thermal protection) icv????(140)r,^?o K?Pq1,???(s100) ,?. www.samhop.com.tw rev. 1.1 @ 2013/03 6
SM8207 (led short protection) SM8207cs_??:?zK^ o. cs?^O?1.0vr,lO? ?P,Mq1Pi,?Fm?? L|_?. @NL|g?oC? ?p?xK?a^.??led ?gtmw,??,j rv i n a?S?,?v i n 8v,SM8207?,icO ?????, ?;w??O?,2 . (led open protection) ?,led?d_,?, ?L|??D{.x?l? ????zcd_?zK2.65v KS1.6usPq1.?@? Sic,SM8207??{Ow(vzn=27v) Q?o. SM8207mPi?v in 8v K?14v?. x?l,O???xr11,r12 ?,?hxzcd?(2.65v)?z K?.ef: ??l?: v led =32v, v zcd_up =1.5v,v zcd_ovp =2.65v v zcd_up v zcd_ovp < < v led x (r11+r12)+r zcd r zcd 1.5v 2.65v < < 32v x (r11+r12)+12k 12k ?2 --- ?? --- x v zcd =2.0v, ? r11+r12=180k , ?? 18 0k . (l1) ??O led , ? ?? , ??D 4 E . ?x^ ac ?? , L|?l?O?? , s????Kp?^ , ? , ?hOx 60khz . t i pk i l fet_on fet_off 1 cycle i pk =v led / l * t_off t_on t_off i pk =(vacv led ) / l * t_on D4: ?? ?3-????: l = v led 2.7 * i led x f sw 1 x v ac v led v ac x k e ; v led ledB?? i led led f sw ?L|l vacK??(r.m.s) ke?a?s0.9(v led =32vr) ke = 90 C sin 1 (v led / 2vrms) 90 ) ( 2 ledc???,??? v led rled?.ske?L|r ??. www.samhop.com.tw rev. 1.1 @ 2013/03 7
SM8207 ?: 1. pcb layoutr???wccic?w??x?,??. 2. ledK?r,???led+,led-,???10? ,S?. www.samhop.com.tw rev. 1.1 @ 2013/03 8 1 l con1 1 n con2 r1 10 r2 150k r3 150k r4 150k r8 1r r9 47k r11 100k r7 100k f1 1a ac 1 ac 2 + 3 - 4 bd1 600v/1a c1 47nf c2 22uf/35v c3 10uf c4 0.22uf c6 0.1uf q1 sdu05n05 + c8 220uf + c7 220uf zcd 1 vcc 2 vin 3 gate 4 5 cs 6 gnd 7 comp 8 u1 SM8207 zd1 27v l1 680uh 1 led+ con3 1 led- con4 zd2 5.1v zd3 20v d1 0.5a/600v r5 10 r10 10 d2 1a/600v r12 100k tvr1
package dimensions 8pin sop symbols inches millimeters min max min max a a1 b cd e e h l xy c1 c2 0.053 0.069 1.35 1.75 0.004 0.010 0.10 0.25 0.014 0.022 0.35 0.56 0.007 0.010 0.18 0.25 0.189 0.197 4.80 5.00 0.150 0.158 3.80 4.00 0.229 0.244 5.80 6.20 0.016 0 0.050 8 0.40 0 1.27 8 0.0638 1.62 0.1921 4.88 0.0236 0.60 0.0499 1.27 e view c view c h d a a1 b e c l recommended land pattern x y c2 c1 0.05bsc 1.27bsc SM8207 www.samhop.com.tw rev. 1.1 @ 2013/03 9
|
