SM34063 dc to dc converter controller fea t ures operation fr om 3.0 to 40v input short cir c uit curr ent limiting low standby curr ent output sw itch curr ent of 1.5a output voltage adjustable fr equency of operation fr om 100hz to 100khz step-up, step-dow n or inverting sw itching re g u l a t o r s curr ent limiting dip-8 sop-8 product description the SM34063 is a m o nolith ic con t rol circu it contain i ng the prim ary functions required for dc-to-dc converters. this device consists of an internal tem p erature compensated reference, com p arator , contro lled d u ty cycle os cillato r with an active c u rrent lim it circu it, d r iv er and high curren t output switch. this device was specif i cally des i g n ed to be incorporated in s t ep-d own and s t ep-up and v o ltage-inverting applications with a m i nim u m num ber of external com ponents. pin configura tion ordering informa t ion part number operating t e mperatur e range package ty p e SM34063n 0 ~+70 dip-8 SM34063m 0 ~+70 sop-8 dr i v e r c o lle c t o r vc c is e n s e pk c o mpar at o r in v e r t i n g in p u t s w i t c h c o lle c t o r sw i t c h e m i tte r t i m i n g c a pac i t o r gn d oei 1/ 8 www.datasheet.co.kr datasheet pdf - http://www..net/
SM34063 dc to dc converter controller absolute maximum ra ting c h a r a c t e r i s t i c s y m b o l v a l u e u n i t power supply v o ltage v cc 4 0 v com p arator input v o ltage range v ir -0.3 to +40 v switch collector v o ltage v c(switch) 4 0 v switch em itter v o ltage (v pin 1 = 4 0 v ) v e(switch) 4 0 v switch collector to em itter v o ltage v ce(switch) 4 0 v driver collector v o ltage v c(driver) 4 0 v driver collector current (note 1) i c(driver) 1 0 0 m a switch current i sw 1 . 5 a power dissipation and therm a l characteristics plastic package t a =25 : p d 1.25 w ??? ??3????? r e ja 100 : /w soic package t a =25 : p d 0 . 6 2 5 w ??? ??3????? r e ja 100 : /w operating junction t e m p erature t j + 1 5 0 : operating am bient t e m p erature range t a 0 to +70 : s t orage t e m p erature range t stg -65 to +150 : not e s : 1. m a xim u m package power dissipation lim its m u st be obser ved. 2. e s d data available upon r e quest. block diagram 1. 2 5 v s ip k o s c illa t o r 2 1 r 3 7 4 6 8 5 re fe re n c e re gu la t o r q gn d ti mi ng sw it ch sw it ch co ll ec tor em it te r ca pa ci tor dr iv e co ll ec to r ip k sen se vc c co mp ar at or in ve rt in g in pu t ct q2 q1 100 + - c o m par at or oei 2/ 8 www.datasheet.co.kr datasheet pdf - http://www..net/
SM34063 dc to dc converter controller electrical charactetristics (v cc =5.0v , t a =t lo w to t hi gh [ n ote1], unless otherwise specif i ed.) c h a r a c t e r i s t i c s s y m b o l m i n t y p m a x unit oscilla t o r frequency ( v pin 5 =0v , c t =1.0nf , t a =25 output switch (note 2) saturation v o ltage, darlington connection (note 3) ( i sw =1.0a, pins 1, 8 connected) v ce(sat) - 1 . 0 1 . 3 v saturation v o ltage, darlington connection ( i sw =1.0a, r pin 8 =82 ? comp ara t o r v th 1 . 2 3 8 1 . 2 5 1.262 threshold v o ltage ( t a =25 t o t a l device supply current (v cc =5.0v to 40v , c t =1.0nf , pin 7=v cc , v pin 5 >v th , pin 2=gnd, rem a ining pins open) i cc - - 4 . 0 m a notes : 1. tlo w =0 7.0ma - driver i output i c c www.datasheet.co.kr datasheet pdf - http://www..net/
SM34063 dc to dc converter controller fig 1.output switch on-off t i me versus oscilla to r t i ming ca pa cito r fi g 2. t i mi ng capaci tor w aveform fig 3.emitter follower configuration output saturation v o ltage versus emitter curr ent fig 4.common emitter configuration output switch saturation v o ltage versus collector curr ent fig 5.curr ent limit sense v o ltage versus t emperatu r e fig 6.s t andby supply curr ent versus supply v o ltage oei 4/ 8 www.datasheet.co.kr datasheet pdf - http://www..net/
SM34063 dc to dc converter controller 1. 2 5 v ip k o s c i l l at or s r . . . ref ere nce reg ula tor q ct l r2 r1 co 28v/ 175m a vout ct 1 2 3 4 5 6 7 8 rs c vi n 12 v vo ut o pti onal filt er > + + + vc c q2 q1 + - c o m par at o r 1n 5819 170uh 18 0 10 0 15 00pf 47k 2. 2k 330 0. 22 1. 0uh 100 t e s t c o n d i t i o n s r e s u l t s li ne r e gul at i on v in =8.0 v to 16v , i o =175 m a 30 m v = d 0.05% load r e gul at i on v in =12 v , i o =75 m a t o 175 m a 10 m v = d 0.017% out put r i ppl e v in =12 v , i o =175 m a 400 m v pp ef f c i e n c y v in =12 v , i o =175 m a 87.7% ou tp u t rip p l e w ith op tio n a l filter v in =12 v , i o =175 m a 40 m v pp fig 7. s t ep-up converter 8-1. external npn sw itch 8-2. external npn saturated switch(see note 5) oei 5/ 8 www.datasheet.co.kr datasheet pdf - http://www..net/
SM34063 dc to dc converter controller fig 8. external curr ent boost connections for i c peak gr eater than 1.5a 1. 25v ip k o s c i l l at or s . . r . 5 .0v/5 00ma r2 reg ulator 4 1 opt ional fil ter 7 vcc 0. 33 ct ct co ref erence 63 l 25v r1 q 2 v out 8 5 vout vin > + + + 100 + - c o m par at o r 220uh 1n 5 819 10 0 1. 0u h 470pf rs c 3. 6k q1 1. 2k q2 47 0 t e s t c o n d i t i o n s r e s u l t s li ne r e gul at i on v in =15 v t o 25v , i o =500 m a 12 m v = d 0.12% load r e gul at i on v in =25 v , i o =50 m a t o 500 m a 3.0 m v = d 0.03% out put r i ppl e v in =25 v , i o =500 m a 120 m v pp short c i rcui t c u rrent v in =25 v , r l =0.1 1.1 a ef f c i e n c y v in =25 v , i o =500 m a 83.7% ou tp u t rip p l e w ith op tio n a l filter v in =25 v , i o =500 m a 40 m v pp fig 9. s t ep-down converter 10-1. e x ternal npn sw i t ch 10-2. e x ternal pnp saturated sw i t ch oei 6/ 8 www.datasheet.co.kr datasheet pdf - http://www..net/
SM34063 dc to dc converter controller fi g 10. e x ternal curr ent b oost connecti o ns for i c peak gr eater than 1.5a s ip k o s c i l l at or 1. 25v r . . . 4 q 8 5 ct refe rence 2 3 r1 -1 2v /1 0 0 m a regu lator 1 r2 7 6 vo ut l 0. 24 vi n 4. 5v t o 6 . 0v vcc co op ti on a l fi lt er vo ut > + + + 10 0 100 0u 150 0pf + - c o m p a r at or 8. 2k 953 rs c 88u h 1n 5819 q2 q1 100 1. 0uh t e s t c o n d i t i o n s r e s u l t s li ne r e gul at i on v in =4.5 v to 6.0v , i o =100 m a 3.0 m v = d 0.012% load r e gul at i on v in =5.0 v , i o =10 m a t o 100 m a 0.022 v= d 0.09% out put r i ppl e v in =5.0 v , i o =100 m a 500 m v pp short c i rcui t c u rrent v in =5.0 v , r l =0.1 910 m a ef f c i e n c y v in =5.0 v , i o =100 m a 62.2% ou tp u t rip p l e w ith op tio n a l filter v in =5.0 v , i o =100 m a 70 m v pp fig 1 1 . v o ltage inverting converter 12-1. e x ternal npn sw i t ch 12-2. e x ternal pnp saturated sw i t ch oei 7/ 8 www.datasheet.co.kr datasheet pdf - http://www..net/
SM34063 dc to dc converter controller fi g 12. e x ternal curr ent b oost connecti o ns for i c peak gr eater than 1.5a not e : 5. i f the output switch is dr iven into har d satur a tion ( non- dar lington config ur ati on) at low switch cur r ents ( 300 m a ) and high dr iver cu rren t s ( 30 m a ), it m a y take up to 2.0 s to co m e out of saturation. t h is condition will shorten the of f ti m e at frequencies 30 k h z, and is m a gnified at high tem p eratur es. t h is conditi on does not occur with a dar li ngton confi gur ation, si nce the output sw itch cannot saturate. if a non-darlington confi guration is used, the following output drive condition is recom m e nded. c a l c u l a t i o n s t e p - u p s t e p - d o w n v o l t a g e - i n v e r t i n g t on /t of f sat in in f out v v v v v ? ? + (min) (min) out sat in f out v v v v v ? ? + (min) sat in f out v v v v ? + | | t on +t of f f 1 f 1 f 1 t of f 1 + + off on off on t t t t 1 + + off on off on t t t t 1 + + off on off on t t t t t on ( t on +t of f )-t of f ( t on +t of f )-t of f ( t on +t of f )-t of f c t 4.0 10 -5 t on 4 . 0 10 -5 t on 4 . 0 10 -5 t on i pk(sw itch) 2i out(m ax) ( off on t t +1) 2i out(m ax) 2i out(m ax) ( off on t t +1) r sc 0 . 3 / i pk(sw itch) 0 . 3 / i pk(sw itch) 0 . 3 / i pk(sw itch) l (m in) ( ) ( (min) ) ( switch pk sat in i v v ? )t on(m a x) ( ) ( (min) ) ( switch pk out sat in i v v v ? ? )t on(m a x) ( ) ( (min) ) ( switch pk sat in i v v ? )t on(m a x) c o 9 ) ( pp ripple on out v t i ) ( ) ( 8 ) ( pp ripple off on switch pk v t t i + 9 ) ( pp ripple on out v t i fi g 13. desi gn formul a t a bl e v sat = sat u rat i on vol t a ge of t h e out put swi t c h. v f = forward vol t a ge drop of t h e out put rect i f i e r . the following power supply characteristics must be chosen: v in ? nom i nal i nput vol t a ge. v out ? desi red out put vol t a ge, i out ?desi r ed out put current . | v out | = 1.25(1+ 1 2 r r ) f mi n ? m i ni m u m desi red out put swi t c hi ng frequency at t h e sel ect ed val u es of v in and i o . v ripple(p-p) ?des i r ed pea k -t o- p eak o u t p ut ri p p l e vol t a ge . i n pract i ce, the calculated ca pacitor valu e wi ll need to be i n crease d due to its equivalent series re sistance and board layout. th e ripple voltage should be kept to a low value since it will directly af fect the line and load regulation. oei 8/ 8 www.datasheet.co.kr datasheet pdf - http://www..net/
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