fr emont micr o devices ft822 pr eliminary low thd, high performance led driver fea t ures description ? extrem ely low input curre nt t hd ? ultra-low ( 50 a) star t - up cu rr en t ? zero -c ur rent s w i t c hi n g a n d m i nim u m off t i m e cont rol ? lead ing edg e b l ank i ng instead o f rc filtering ? adju stab le lin e co m p en sation ? adju stab le ou tp u t ov ervo ltage pro t ectio n (o vp ) ? vcc over vol t age protection ? ou t p u t short circu it pro t ection ( oscp) ? ic ove r tem p erature protection(otp) ? o p en con t ro l lo op pr o t ection ? di sabl e fu nct i o n ? few e x t e r n al c o m pone nt s re q u i r e d ? d i p- 8 / so p- 8 pack ag es applica t ions ? ac/dc led dri v er ap p licatio n s ? co mmercial & in du strial ligh t in g ? arch itectu r e detail lig h tin g ? street lam p lig h tin g the ft 8 2 2 i s a cu rre nt -m ode co nt r o l p f c le d dri v er ic . it p r ovi des a co nt r o l l e d o n -t i m e to re gul at e the output and ac hieve natural powe r factor co rrectio n. the h i gh ly lin ear m u ltip lier mak e s th e devi ce ca pa bl e o f w o rki n g i n wi de i n p u t v o l t a ge rang e app licatio n s (fro m 85 v to 26 5v) with an excellent t h d. the de vice fe atures ext r em e l y low cons um ption ( 50 a be fo re st art - u p a nd 4m a o p era t i ng) a n d i n cl ude s a di s a bl e f unct i o n sui t a bl e f o r i c rem o te on/ off con t ro l, wh ich m a k e s it easier to co m p ly wi t h e n er gy sa vi n g no rm s. the ft 822 fe atures fruitf ul pr ot ect i o n s l i k e o t p, ovp, oscp. adju stab le ou tpu t overvo ltag e p r o t ectio n(ovp) en ab les to safely h a n d l e ov ervo ltag e resu lting from lo ad d i scon n ection . ou tp u t sh ort circu it pro t ectio n (oscp) red u c es th e inpu t power co nsu m p tio n wh en ou tpu t sho r t circu it is detected . the t o t e m - pol e o u t put st age i s ca pa bl e of d r i v i n g a m o sfet or i g b t wi t h so u r ce a n d si nk c u r r ent s o f 40 0 m a typ i cally. th e d e vice is o p tim ize d fo r low thd led lightin g ap p lication u p to 60w. w w w .frem ontm i cro.com p a g e 1 o f 6 d s 8 2 2 ? a 2
fr emont micr o devices ft822 pr eliminary typic a l a pplic a t i o n cir cui t 5 2 1 8 3 4 7 ft 822 emi 6 led + le d- vac 85 v ? 265 v figur e 1: t y pi cal application cir c ui t absolute maximum ra tings vcc to gnd???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ??? -0.3v to + 2 8v fb to gnd ???? ?? ???? ?? ???? ?? ???? ?? ???? ....? ??? -0.3v to +7v comp to gnd?? ??? ???? ?? ???? ?? ???? ?? ???? ?? ???? -0.3v to + 7 v mult t o gnd?? ??? ???? ?? ???? ?? ???? ?? ???? ?? ???. ..-0.3v to +7v cs to gnd? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ??.... ... -0.3v to 7v iaux??? ???? ?? ???? ?? ???? ?? ???? ?? ??? -5m a (s ource ) / 5m a(sink) ope r ating tem p erat ure ra nge ???? ?? ???? ?? ???? ?? ???? ?? ? -40 to + 1 2 5 junction tem p erature ??? ???? ?? ???? ?? ???? ?? ???? ?? ?. ...-40 to +1 50 stora g e tem p erature range ???? ?? ???? ?? ???? ?? ???? ?? ??. -60 to +15 0 esd protection hbm? ? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ?.3500v esd protection mm?? ? ???? ?? ???? ?? ???? ?? ???? ?? ??.. . ? ? ? ... . 200v * s t r e sses e x c eed th ose liste d under ?abs olute maximu m ratin g s? m ay c a use per m anen t d a m a ge to the devi ce. func ti on al oper ati o n o f the de vi ce a t c o n d i t ions be yond th ose liste d in the speci ficati on is not g u a r anteed. pr o l ong e d ex po sur e to ex tr eme conditi ons may a f fect dev i ce r e lia bility o r functiona l i t y. w w w .frem ontm i cro.com p a g e 2 o f 6 d s 8 2 2 ? a 2
fr emont micr o devices ft822 pr eliminary pin c o nfi g ur ati o n fb comp mult cs vcc ga te gnd aux top view 1 2 3 45 6 7 8 figur e 2: pin assi gnme nts termi nal descr i pt ion no . p i n fun c tio n 1 f b in vert i n g i n p u t of e r r o r am pl ifi e r . the i n f o r m at i on o n t h e out put i s fed i n t o t h e pi n t h r o ug h an opt o-c o upl e r . the pi n al s o as an o n / o f f cont rol i n p u t . 2 c o mp out put of the error am plifier . a com p ensati on net w ork is placed bet w ee n this pi n a n d fb ( p i n # 1 ) t o ach i ev e stab ility o f th e con t ro l lo op and en su re h i g h po wer fact o r and l o w current thd. 3 m u l t main inpu t to th e m u ltip lier . th is p i n is co nn ected to the rectified m a i n s vo ltag e v i a a resi st or di vi de r an d pr o v i d es t h e si nus oi dal r e fere nce t o t h e cur r ent l o o p . 4 c s inpu t to th e pwm co m p arat o r . th e cu rr en t f l ow ing thr oug h th e m o sfet is sensed by a resisto r , th e resu ltin g vo ltag e t o g e t h er with lin e co m p en satio n vo ltag e is ap p lied to th is pin an d co m p ared with an in tern al sinu so i d al-sha p e d referen c e, g e n e rated b y t h e m u ltip lier , t o d e term in e mosfet? s t u rn -o f f . 5 a u x inpu t fro m au xiliary win d i n g sen s ing resistor d i v i d e r for d e mag n e tizatio n ti min g , a negat i v e - goi ng e d ge aft e r m o sfet ? s m i ni m u m of f t i m e t r i gge rs m o sfet ? s t u r n - o n. aux do ub le as osc p an d adj u stab le ovp l a tch pro t ectio n in pu t. 6 g n d g r o und . 7 g a t e gate driv e ou t p u t . 8 v c c su ppl y v o l t a ge o f bot h t h e si g n al pa rt of t h e ic an d t h e gat e d r i v e r . ta b l e 1 w w w .frem ontm i cro.com p a g e 3 o f 6 d s 8 2 2 ? a 2
fr emont micr o devices ft822 pr eliminary ord e ri ng informa t ion ft822 ta b l e 2 desig n a t o r s y m b o l p a ck age t y p e a s o p - 8 b d i p - 8 markin g rule 1 2 3 45 6 8 7 ft 82 2 ? fi gur e 3 ma rki n g r u l e ?? f o r i n ternal refe re nce w w w .frem ontm i cro.com p a g e 4 o f 6 d s 8 2 2 ? a 2
fr emont micr o devices ft822 pr eliminary p a kaging informa t ion d i p ? 8 pa ckag e dimensions in millimeters dimensions in inches symb ol m i n m a x m i n m a x a 3. 71 0 4. 31 0 0. 14 6 0. 17 0 a 1 0 . 51 0 0 . 02 0 a2 3. 20 0 3. 60 0 0. 12 6 0. 14 2 b 0. 38 0 0. 57 0 0. 01 5 0. 02 2 b1 1.524 bsc 0 . 06 0 bs c c 0. 20 4 0. 36 0 0. 00 8 0. 01 4 d 9. 00 0 9. 40 0 0. 35 4 0. 37 0 e 6. 20 0 6. 60 0 0. 24 4 0. 26 0 e 1 7. 32 0 7. 92 0 0. 28 8 0. 31 2 e 2 . 54 0 (b sc ) 0. 10 0 bs c l 3. 00 0 3. 60 0 0. 11 8 0. 14 2 e 2 8 . 40 0 9. 00 0 0. 33 1 0. 35 4 w w w .frem ontm i cro.com p a g e 5 o f 6 d s 8 2 2 ? a 2
fr emont micr o devices ft822 pr eliminary sop ? 8 pac k age dimensions in millimeters dimensions in inches symb ol m i x m a x m i n ma x a 1. 35 0 1. 75 0 0. 05 3 0. 06 9 a1 0. 10 0 0. 25 0 0. 00 4 0. 01 0 a2 1. 35 0 1. 55 0 0. 05 3 0. 06 1 b 0. 33 0 0. 51 0 0. 01 3 0. 02 0 c 0. 17 0 0. 25 0 0. 00 6 0. 01 0 d 4. 70 0 5. 10 0 0. 18 5 0. 20 0 e 3. 80 0 4. 00 0 0. 15 0 0. 15 7 e 1 5. 80 0 6. 20 0 0. 22 8 0. 24 4 e 1 . 27 0 (b sc ) 0. 05 0 bs c l 0. 40 0 1. 27 0 0. 01 6 0. 05 0 0 8 0 8 w w w .frem ontm i cro.com p a g e 6 o f 6 d s 8 2 2 ? a 2
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