SD686X hangzho u? silan ?m ic roelectr onic s? co.,lt d rev:1 .0??????????????? 2010 .03 . 12 h ttp :/ /w w w . si lan .co m. cn ??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? pa ge? 1?o f? 10 current?mode?pwm+pfm? c ontroller?with? bu ilt-in? h igh?voltage mo sfet dip-8-300-2.54 description SD686X ? is? cu rr e nt? mode? p w m+ pfm ? con trolle r? w i th? bu i lt -in? hi g h- voltage ? mosfet ? use d? for? s w ps , w i th? low ? s tandby? powe r? a nd? l ow st art ? cu rr e nt? for? p owe r? sw i tch. ? in? s tandby? mode,? the? c i rcuit? enters burst? mode? to? reduce ? the? st andby? powe r? di s sipat i on . the ? switch fr e que ncy?is ?25~67k hz ?w i th? j itt e r?fre que ncy? for?low ?emi . built-i n ? pe ak? cu rr e nt? co mpensat i on ? c i rcui t m ak es ? t h e? l i m i t? o u t p ut powe r? stable ? e ve n? wi th? dif fere nt? input ? ac ? vo l tage .? l imit ? output powe r? can? be ? adj u st e d? through ? the? resi st o r. ? ma ximum?peak?current compensation?during?power-on?reduces ? p r es s ur e? o n ? tr a n sf orm er? to avoi d ? satura tion,? the? pe ak? c urre nt? co mpensat i on ? w ill? de cr e ase ? for bal an ce ?aft e r? powe r- o n. i t? i n t eg r at es va rious ? prote ctions? s uch ? as ? unde rvol tage? l o ckout, ove rv oltage ? p rot e ction ,? ove rload ? prote ction ,? l e ad? e dge ? b l a nki ng , prim a ry ? w i nd i ng? o ve rc urre nt? prote ction? and? ther m a l ? s hutdow n.? the c i rc ui t? w i l l ?r es t a rt ? u n ti l ?n o rm al ?i f ? pr ot ec t i on ? oc c u rs . features *? ?e ne rg y?s ta r?2 .0 ?st an da rd *? ?lo w e r?s ta rt -up ?cu r re nt? (3 m a) *??various?sw i tch i ng?f reque ncy? followin g?load ?for?t he ?highe r ef f i ci en c y *? ?f re qu e nc y? ji t te r?f or ?low ?e m i *?ov e rv o l tage ,? ove rcur rent,?ove rl o ad?and? ove r?t e m pe rat u re prot e ction s. *??adjustable ?limit?ou tput?pow e r *??unde rv o l tage? l oc kout *??built-in ?high?voltage ?m osfet *??aut o ?re st art?mode *??pe ak? cu rr e nt?co mpensat i on *??max im u m?pe ak? cu rr e nt?co mpensat i on ?for? i nit i alizat i on *??bur s t? mode *??cyc le?by? cyc le?cur re nt?l imit applications *?swps http://
SD686X hangzho u? silan ?m ic roelectr onic s? co.,lt d rev:1 .0??????????????? 2010 .03 . 12 h ttp :/ /w w w . si lan .co m. cn ??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? pa ge? 2?o f? 10 ordering?information part?no. package marking material package?type sd6860 sd6860 p b ? fr ee tube sd6861 sd6861 p b ? fr ee tube sd6862 sd6862 p b ? fr ee tube sd6863 sd6863 p b ? fr ee tube sd6864 dip-8-300 -2.54 sd6864 p b ? fr ee tube typical?ouput?power?capability 190~265v 85~265v part?no. adapter open adapter open sd6860p 65k67 7w 9w 5w 7.2w sd6861p 65k67 1 0w 1 4w 8w 12w sd6862p 65k67 1 2w 1 7w 1 0w 14w sd6863p 65k67 1 4w 1 9w 1 2w 15w sd6864p 65k67 1 6w 2 1w 1 4w 18w block?diagram s r q fb dr comp 7 .6v 14 . 8v v cc + - + - gnd fb adj reduced frequency control osc frequency jitter internal bias level?shift ov er? v o lt a ge, ? ov er c ur rent , ? ov er? load ? an d ov e r? t em per at u re prot ec t i ons burst?mode control leading edge blanking control driver peak?current compensation lim it ? ou tp ut p ow er? ad jus t
SD686X hangzho u? silan ?m ic roelectr onic s? co.,lt d rev:1 .0??????????????? 2010 .03 . 12 h ttp :/ /w w w . si lan .co m. cn ??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? pa ge? 3?o f? 10 absolute?maximum?rating characteristics symbol rating unit d ra in - ga te ?v ol tag e ?(r gs =1m w ) v dgr 650 v ga te -s ou rce ? (gn d )?v o l tag e v gs 30 v sd6860 4 sd6861 6 sd6862 8 sd6863 11 dr ai n ? cu r r e nt? puls e note1 sd6864 i dm 14 a sd6860 1 sd6861 1.5 sd6862 2 sd6863 3 continuous ?drain curr e nt (tamb=25 c) sd6864 i d 4 a sd6860 15 sd6861 30 sd6862 68 sd6863 140 s ig n a l?p u lse avalan che ene rgy note2 sd6864 eas 200 mj powe r? supply?vo ltage v cc ,max 28 v fee dback?input? v oltage v fb -0 . 3 ~8 v limit?output ?powe r?voltage v a dj -0 . 3 ~8 v p d 1.5 w total? powe r?dissip ation d art ing 0.017 w/ c operating ?j u nction ?te m pe rature t j +170 c operating ?te m pe rature t a mb -25~+85 c s t o r ag e? t em p er at ur e t stg -55~+150 c note:?1.?pulse?width?is?limited?by?maximum?junction?temperature; 2.?l=51mh,?t j =25 c(start) electrical?c haracteristic s ? (fo r?m os f e t ,? un le ss ?o the rw ise ?s pe cif ie d,? t a mb =25 c) characteristics symbol test?conditions min. typ. max. unit drai n -sou rc e ?br e akdown ?vo l tage bv d ss ?v gs =0 v, ?i d =50 m a 650 -- -- v v ds =650v,? v gs =0v -- -- 50 m a z er o ? g at e? v ol t a g e? dr a i n ? c ur r en t i d ss v ds =480v,? v gs =0v ta m b=1 25 c -- -- 200 m a sd6860 -- 14.0? 16.8 sd6861 -- 8.0 9.6 sd6862 -- 5.0 6.0 sd6863 -- 4.0 4.8 s tat ic ?d ra in -s ou rce on ?re si stan ce sd6864 r ds (o n) v gs =10v,?i d =0.5a -- 3.0 3.6 w
SD686X hangzho u? silan ?m ic roelectr onic s? co.,lt d rev:1 .0??????????????? 2010 .03 . 12 h ttp :/ /w w w . si lan .co m. cn ??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? pa ge? 4?o f? 10 characteristics symbol test?conditions min. typ. max. unit sd6860 -- 210 -- sd6861 -- 250 -- sd6862 -- 550 -- sd6863 -- 640 -- input? cap ac i tance sd6864 c iss ?v gs = 0v ,?v ds =25v , ?f=1mh z -- 840 -- pf sd6860 -- 18 -- sd6861 -- 25 -- sd6862 -- 38 -- sd6863 -- 40 -- output?capa citance sd6864 c oss ?v gs = 0v ,?v ds =25v , ?f=1mh z -- 44 -- pf sd6860 -- 8 -- sd6861 -- 10 -- sd6862 -- 17 -- sd6863 -- 30 -- r ev er s e? t r a n sf er capaci tance sd6864 c r ss ?v gs = 0v ,?v ds =25v , ?f=1mh z -- 40 -- pf sd6860 -- 10 -- sd6861 -- 12 -- sd6862 -- 20 -- sd6863 -- 33 -- t ur n? on ?d e lay ?t i m e sd6864 t d(o n) ?v dd =0.5bv d ss ,?i d =2 5 ma -- 40 -- ns sd6860 -- 3 -- sd6861 -- 4 -- sd6862 -- 15 -- sd6863 -- 19 -- ri se? tim e sd6864 tr v dd =0.5bv d ss ,?i d =2 5 ma -- 25 -- ns sd6860 -- 27 -- sd6861 -- 30 -- sd6862 -- 55 -- sd6863 -- 70 -- t ur n? o ff ?d e lay ?t i m e sd6864 t d ( o f f) ?v dd =0.5bv d ss ,?i d =2 5 ma -- 90 -- ns sd6860 -- 8 -- sd6861 -- 10 -- sd6862 -- 25 -- sd6863 -- 32 -- fall ? t im e sd6864 tf v dd =0.5bv d ss ,?i d =2 5 ma -- 42 -- ns electrical?c haracteristic s ?( u nl es s ? ot h er w i s e? sp ec i f i ed ,? v cc = 12 v ,?t a mb =25 c) characteristics symbol test?conditions min. typ. max. unit undervoltage?section start?threshold?voltage v start 14 14.8 16 v stop?threshold?voltage v stop 6.6 7.6 8.6 v
SD686X hangzho u? silan ?m ic roelectr onic s? co.,lt d rev:1 .0??????????????? 2010 .03 . 12 h ttp :/ /w w w . si lan .co m. cn ??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? pa ge? 5?o f? 10 characteristics symbol test?conditions min. typ. max. unit osc illa to r ? s ectio n max .? oscil l ate?f reque ncy f oscmax v fb =3v 61 67 73 khz min.? os c i lla te?freque ncy f oscmin v burl SD686X hangzho u? silan ?m ic roelectr onic s? co.,lt d rev:1 .0??????????????? 2010 .03 . 12 h ttp :/ /w w w . si lan .co m. cn ??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? pa ge? 6?o f? 10 pin?configuration pin?description pin?no. pin ? name i/o function?description 1 g nd i ground 2 adj i adj?pin 3 v cc i power?supply?pin 4 fb i /o feedback?input?pin 5 nc - nc 6,?7 , ?8 dr o drain?pins. function ?descri ption SD686X ? i s ? de signe d? for? o ff-line ? sm ps, ? con sisting ? o f? h i gh ? v ol tage ? mosfe t,? op ti mi z e d? gate ? drive r? and ? c urre nt mode? p w m+ pfm ? con tr o lle r? whi ch ? include s? fr e que ncy ? osc illat or? and ? va rious ? p rote ct i o ns ? suc h ? as ? un de rv oltage l ocko ut,? ove rv o ltage ? prote ct ion? and? ove rl oa d? prote ction .? f re que ncy? j i tte r? ge ne rat e d? fr o m? o sc i lla tor ? i s ? use d? to l owe r? em i. ? burs t?m ode ? i s ? ad opted? d uring ? ligh t? l oa d?t o ? l owe r? s tandby? powe r? diss i pation ,? and ? funct i on ? o f? l e ad? e dge bl ank i ng ? e l imina tes? the? m osfet? e rror ? shu tdown ? ca use d? by ? inte rf e rence ? thr ou gh?m in imi z i ng ? mos fet?t urnin g? on tim e .?? pe ak? curre nt? c o mpensat i on?re duce s? the?pr e ssu re?on? tr ansf o rm e r?during ?circuit?starts?an d?outpu t? powe r?li mit can? be ? adjuste d? by ? resis tor? through ? adj ? p i n .? fe w? pe riphe ral? co mponents ? a re? ne e d e d? for? h i ghe r? e ffi c i e ncy? a nd hi ghe r?reliabil i ty?an d?it? i s ?s u i table ?for?flyback ?c onve rte r? and ?forw ard?conve rt e r. 1. un d e r? vo l t a g e?l o cko ut ? an d?s el f-s t a rt at? the? be ginni ng,? the? ca pac i tor ? conne ct e d ? to? p i n ? v cc ? i s ? ch arged? v i a ? s tart? resistor? by ? h i gh ? voltage ? ac ? a nd ? the circu it ? sta rts? to ? wor k? if ? vo lt age ? a t? v cc ? i s? 14 .8v .? the ? output ? and? fb? so urc e ? cu rr e nt? a re? shutdow n? i f? there ? i s ? any p r o t ec ti o n? d uri n g? n orm al ? o p er at i on ? an d? v cc ? i s? d ec r ea s ed ? b ec a u s e? o f? po w er i n g? of ? au xi l i ar y? w i nd i ng .? ? t h e? w h ol e control? c ircu i t? i s? shu tdown ? if? vo l tage? a t? v cc ? i s ? 7.6v ? be l o w? to? l owe r? cu rr e nt? d i ss i pa tion? and ? the? ca pac i tor ? i s recharge d?for?r e st a rti ng .
SD686X hangzho u? silan ?m ic roelectr onic s? co.,lt d rev:1 .0??????????????? 2010 .03 . 12 h ttp :/ /w w w . si lan .co m. cn ??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? pa ge? 7?o f? 10 2. f re quen cy? j itter ?an d? red uc ed? fr eq ue ncy ?mo de the ? oscilla ti o n?f reque ncy? i s ? ke pt? ch ange d?f or?l ow? em i? and ? de cr e asi ng ?r ad i ation ? on ? one ?f reque ncy.? the ? o sc i lla ti o n fr e que ncy? change s ? wi thin ? a ? ve ry? s mall? range? to? s imp l ify ? em i? de si g n.? the ? rule ? o f? fr e que ncy? chang i ng ? (freque ncy ce nter? i s ?67khz ):? 2.5khz ?c h ange ?in? 4 ms,?64? fr e que ncy? p oi n ts ?in ?all. for? hi g h? e ffi c i e ncy,? fr e que ncy? i s ? chan ge d? acco rding ? to? cu rr e nt? output ? fro m? fb? p i n .? w he n? fb ? cu rr e nt? is? above ? a c er t a i n? va l u e? ( di ff er en t ? wi t h? di ff er en t ? v er s i o n)? w i t h o ut? l i m i t? o ut p u t? p o w er? a dj u st ,? f r eq u en c y ? d ec r ea s e? fr om ? 67 k h z to?t yp .?25khz . 3. p ea k ?c ur r ent ? co m pe ns at i o n? an d? no r mal i z at i on g en er a l l y ,? l i m i t? ou t p ut? p o w er? c h a n g es? w i t h? di ff er en t ? i n p ut s. ? l i m i t? o ut p u t? po w er ? i s? h ol d? i n? t hi s? ci r c ui t? b ec a u s e? of pe ak? cur rent ? co mpensat i on .? la rger? pe ak? c urre nt? co mpensat ion? for? h i ghe r? i npu t? ac ? vo l tage ,? it? de cr e ase s? to? z e ro wit h ?li g ht?load? and?no? pe ak? cu rr e nt?co mpensat i on ?in? bu rs e ?mo de . max im u m? pe ak? cu rr e nt? co mpensat i on? d uring? powe r- on? reduce s? pressure ? on? tr an sf o rm e r? to? avo i d? s atura ti o n,? the pe ak? curre nt? c o mpensation?w ill? de cr e ase ?f o r? ba l an ce ?aft e r? po we r- on.?the ?duration ?is? de cide d?by ?the ?load . 4. limit ?out p ut?p ow e r?a djust limit? ou tput? powe r? i s? adjuste d? by ? va ry ing? fb?curre nt? thr ou gh ? resis tor? rad j? ad j us t.? w he n? rad j=0 ,? n o? chan ge ? i n l imit ?outpu t? p owe r; ?whe n?radj ?ex cee ds? ty p .? 20k ,?limit?outp ut? p owe r? be gi ns ?to? be ?re duce d. 5. b ur st? mo de w o rkin g? i n ? this ? mode? to? reduce ? powe r? d i s sipat i on .? it? wo rks? n orma l ly? whe n? fb? i s ? 0 .5v ? above ,? and ? du ring 0 . 3 5 v < f b? <0 . 5 v,? th er e? a r e? t w o? di ff er en t? c o n di t i o ns :? w h en? fb ? c ha n g es ? f rom ? l o w? t o? hi g h,? t h er e? i s? no? a ct i on? f or switch? and? it? i s ? the? sa m e ? wi th? cond iti o n? o f? fb ? l owe r? than? 0.35v ;? the? o ther? i s? that? fb ? cha nge s? for m? h i gh ? to? l ow, co m pa rison ? va l ue ? i s ? i n cr e ase d? for? i ncr e as i ng? turning? on ? ti me ? to? de cr e ase ? swit ch ? loss .? in? this? mode,? sw itch i ng fr e que ncy?is ?dow n?to ?25khz . for? this ?m ode ,? during ? fb ? chan ge s? for m? high?t o ?l ow, ? the ? outp ut? vo l tage?i nc rease s? (inc reasing ? spe e d? is? de cide d? by l oad )? be cause ? o f? the? h i gh ? co mpari so n ? va l ue ? to ? de cr e ase ? fb? until? i t? i s ? 0 .35v ? be l ow ;? whe n? fb ? <0 .35v ,? there ? i s ? no action ? for ? sw i tch?and ? ou tput?voltage ? de cr e ase ? (de cr e asi ng ? sp ee d? i s ? a l so ? de ci de d ? by ? load) ?t o ? incre ase ? fb ? vo l tage .
SD686X hangzho u? silan ?m ic roelectr onic s? co.,lt d rev:1 .0??????????????? 2010 .03 . 12 h ttp :/ /w w w . si lan .co m. cn ??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? pa ge? 8?o f? 10 f b ?vo lta ge ?is ?0 .5v ?be low ?w ith ? lig ht ?loa d. ?t h is ?is? re pe ate d?to ?d e cre as e ?ac tion ?of ?sw i tch ? fo r? low e r?p ow e r?d iss ipa tion . 6. lead i ng ?ed g e? bl an king f o r? t hi s? c u rr en t - co n tr ol l ed? ci r c ui t ,? t h er e? i s? p ul s e? p ea k? c ur r en t? d u r i n g? t h e ? tr a n si en t? of ? s w i t c h? t ur n i ng? o n? a n d? t h er e? i s an? e rr or? ope rati on? if? the ? cur rent? i s ? sa mple d? during? this? ti m e .? and? l e ading? e dge ? bl ank i ng? i s? adop ted? to? e li mi na te this? e rror ? ope rati on .? t he ? output? of? p w m ? co mparator? i s ? us e d? for? con tr o lling? s hutdow n? a fte r? the? l e adi ng ? e dge bl ank i ng ?if?the re?i s?any ?output?d rive . 7. ov er?volt age ?pr ote ction t h e? o u t p ut ? i s? s h ut d o w n? i f? v ol t ag e? a t? v c c? exc eed s ? t h e? t h r esh o l d? v al u e? a n d? t hi s? st a t e? i s? k ep t ? un ti l ? t h e? c i r c ui t ? i s powe red?on? rese t. 8. ove r load ? p r o t ec tio n fb? vo ltage ? i ncr e ase s? if? there ? is ? ove rl o ad ? and ? the? ou tput? i s ? shu tdown ? whe n? fb? voltage ? i s ? up ? to? the ? fee dback sh utd ow n?v ol tag e .?t hi s?s ta te ?is ?ke pt ?un til?the ?c ir cu i t ?is?p ow e re d?o n ?re se t. 9. c y cl e ?b y?c y cl e ?p e ak ?c u rr ent ?li mi t duri n g? e ach ? c ycl e ,? the? pe ak? curre nt? va l ue ? i s ? de ci de d? b y ? the? co m pa rison ? v al ue ? of? the? co mparator ,? whi ch ? wi ll? not ex cee d? the? pe ak? cur rent? l imite d? va l ue ? to? guarante e ? the? curre nt? on? m osfet? w i ll? n ot? be ? l arger? than? the? rat i ng cur rent .?the ?out p ut?powe r? w ill? no t?i nc rease ?i f? the?curre nt?r e ache s? the?pe ak? va l ue ?to?l imit?the? m ax .?ou tput?p owe r. the ?out pu t?voltage?de cr e ase s? and ?fb?voltage ?inc rease s? i f? there ?i s ?ov e rload ?and?co rr e spond i ng ?pr o tect i on ?oc cu rs. 1 0. pr imar y? w i n d ing? ov er ?cu rr en t?p rot ec tio n if? se conda ry? d i ode ? i s ? sho rt,? or? the? trans for m e r? i s ? sho rt,? thi s? p rot e ction ? w ill? oc cur. ? at ? this ? ti m e ,? on ce ? it ? is? ove r cur rent ?i n ? sp ite ? of?t he ?l e adi ng ? e dge ? blank i ng ? (l.e .b)?t im e ,? prote ct i o n? w ill? be gin?afte r? 3 50ns ,? and ?i s ? ac tive ? for ? e ve ry
SD686X hangzho u? silan ?m ic roelectr onic s? co.,lt d rev:1 .0??????????????? 2010 .03 . 12 h ttp :/ /w w w . si lan .co m. cn ??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? pa ge? 9?o f? 10 cycl e .? w he n? the? vo l tage ? on? the? curre nt? se nse ? resistor? i s? 1 .7v ,? thi s? prote ction? w ill ? o ccu r? and? the? output? i s? shu t do w n. ?t hi s? sta te ?is?k e pt ?un til ?the ?un de r?vo ltag e ?oc cu rs ,?a nd ? th e ?circ ui t?w i ll ?s tar t . 1 1. th erm al?s hutd own if ? the? circu it? is? ove r? te m pe rat u re,? the? ove r? te m pe rature? prote ction? w i ll? s hut? down? the? output? to? p reve nt? the? circu it fro m? da ma ge .?t his ?s ta te ?is ?ke pt ?un t i l?i t?qu i t? the ?te m pe ra tu re ?pr ote cti on , ?an d ?t he ?ci rcu it?w il l ?st ar t. typical?application?circuit n o t e: t h e? c i r c ui t? a n d? p ar am e t er s ? ar e? f or? r ef er en c e? o n l y, ? p l ea s e? s et ? t h e? pa r am e t er s ? o f the ? real ? app l icat i on ? c ircu i t base d?on?t he ?r e al?t e st.
SD686X hangzho u? silan ?m ic roelectr onic s? co.,lt d rev:1 .0??????????????? 2010 .03 . 12 h ttp :/ /w w w . si lan .co m. cn ??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? pa ge? 10? of? 10 package?outline di p-8 -30 0-2 .54???????????????????????????????????????????????????????????????????????????????????????????????????? ?u n it:?mm mos?de vices ?operat e?no tes: e l ec t r os t ati c ?c h a rg es ?m a y ? exi s t? i n ?m a ny ?t hi n g s. ? pl ea s e? t a k e?f o l l o w i ng ? pr ev en t i v e?m ea s ur es ? t o? pr ev en t ? ef f ec ti v el y the ?m os ?e le ctr ic? ci rcu i t?a s?a ?re su lt?of ? the ?da ma ge ?whi ch ? is ?ca us e d?b y?d is ch ar ge : l ? the ?operat or? must? p ut?on ?wrist? s trap? wh i c h?shoul d?be?e arthe d?t o ?agains t?e l e ct rosta tic. l ? equipm e n t?case s? sh ould?be ?earthe d. ? l ? all? tool s? u se d?duri ng ?asse m bly, ?inc l ud i ng?so l de ri ng ?tools?and? sol de r?baths, ?mus t? be ?ear thed. l ? mos?de vice s? shou l d ?be?packe d?in ?antistat i c/conduc tive ?c on taine rs ?fo r?t ranspo rt a tion. d i scl ai me r? : s il a n? r es er v es? t h e ? right ? t o ? m ak e ? c h a n g es? t o ? t h e ? in f o rm a t i o n? h er e in? f o r? t h e ? im pr ov e m ent ? of? t h e ? d esign? and? p erf orm anc e w it ho ut ? f urt h er? n o t ic e ! ? cu st o m ers? sh ould? o bt a i n? t h e ? l a t e st? r e l ev ant ? inf or m a t ion? b ef or e ? pl a c in g? o rd er s? a n d? sh ould? v eri f y t ha t ? s uc h? inf orm a t i o n? is? c o m pl e t e ? a n d? c urr ent . a ll ? se m ic ond uc t or? pr oduc t s?m a l fu nc t ion? o r? f a il ? w it h? s o m e ? p r ob a bil it y? und er ? sp e c i a l? c o ndit i ons.?w he n? usin g? s il a n? p r o d uc t s in? sy st e m ? d esign? or? c o m pl e t e ? m a c hin e? m a n uf a c t u rin g, ? it ? is? t h e ? r espon sibil it y? of? t h e ? bu y e r? t o ? c o m ply? w it h? t h e ? s af e t y st a nd ar ds? stri c t ly? a nd? t ak e ? ess ent i a l? m easur es?t o ? a v oid? sit u a t i o n s?i n? w hic h ? a ? m a l fu nc t ion? o r? f a il u r e ? of?suc h? s il an? pr oduc t s c o ul d? c ause ? l os s? of?b ody?i nju ry? or? d a m a g e ? t o ? p r o p ert y. s il a n? w il l? su pply? t h e ? b est? p o s sibl e ? pr oduc t ? f or? c ust o m ers!
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