View SG6842J_7692457.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

produc t specifica tion highly-inte g r a te d green-mode p w m contr o ller SG6842J ? s y ste m g e ner a l co rp . - 1 - www . s g . co m . t w v e r sio n 1 .4 ( i a o 3 3 .00 15 . b 4 ) feb . 13 , 2006 features gree n-m ode p w m c o nt r o l l e r low start - up cu rr en t ( 8ua ) low op eratin g cu rren t (4 m a ) pro g rammab l e pw m frequ en cy with jittering peak -cu rre nt - m ode ope r at i o n cycle-b y -cycle cu rren t limi tin g sy nch r oni ze d sl ope c o m p en sat i on leadi n g- ed ge b l anki n g c onst a nt o u t p ut po wer li m i t (ful l ac in p u t r a nge ) vdd ov er voltag e pro t ection (ovp) pr og ram m a bl e ove r tem p erat ure pr ot ect i o n (ot p ) in tern al latch circu it (otp, ovp) op tion s int e r n al ope n -l oo p pr ot ect i o n applications g e n e r a l-p u rp ose sw itch m o d e pow er supp lies an d f l yb ack pow er co nv er ter s, in clu d i ng : note bo o k p o w e r ada p ters ope n -fram e smps des cript ion the hi ghl y i n t e grat ed s g 68 42 j se ri es o f p w m cont roll e rs pr ovi des se veral feat ures t o enha nce t h e per f o r m a nce of fly b ac k c o n v e r t e rs. to m i nim i ze st and b y p o w e r co ns um pt i on, a p r op r ietar y green- m o d e fun c tio n pro v i des of f-ti m e m odul at i on t o co nt i n u o u sl y dec r ease t h e swi t c hi ng fre que ncy at l i ght -l oa d co n d i t i ons . to a voi d acou st i c -n oi se p r obl em , t h e m i nim u m pwm fre q u enc y set abo v e 2 0 k h z. t h i s gree n - m ode f unct i o n e n abl e s t h e p o wer supp ly to easily meet in tern atio n a l power conser vat i on r e qui rem e nt s. to f u rt her re duce p o we r con sum pt i on, sg 68 4 2 j i s m a nufact ure d by usi n g t h e bicmos p r o c ess. th is allows th e lo west start-up cu rren t aro u nd 8 u a , a nd t h e o p e r at i n g cu rre nt i s o n l y 4m a. as a result, larg e start-up re sistance can be use d . sg6 842 j in teg r ates freq u e n c y j ittering fun c tion in tern ally. th e frequ en cy j ittering fun c tio n h e lp s red u c e em i em i ssi on of a p o we r su ppl y wi t h m i nim u m l i n e filters. also, its bu ilt-in sy n c hro n i zed sl o p e co m p en satio n achi e ves st abl e pea k -cu r rent -m ode c ont rol . the proprietary int e rnal line c o m p ensation ensures c o nstant out put p o we r l i m i t ove r a wi de ac i n p u t v o l t a ges, f r om 9 0 va c to 264v a c . sg 68 4 2 j pr o v i des m a ny pr ot ect i on f unct i on s. in ad d ition to cycle-b y -cycle cu rren t limitin g , th e in tern al ope n - l o op pr ot ect i on ci rc ui t ens u res sa fet y s h o u l d a n o p en l o o p or out put sh ort - ci rc ui t fa i l u re occu rs. p w m out put i s d i sab l ed till v dd d r op s b e low th e uvlo lo wer lim i t . th en , th e co ntro ller starts up agai n. as long as v dd exceeds a b out 24v, t h e i n ternal ovp circ uit is t r iggere d. an exte rnal ntc t h erm i stor ca n be applied for ove r-t em perat u re pr ot ect i o n . f o r ov p a n d otp , t h e pr ot ect i on m ode can be c h o sen t o be l a t c h o ff o r aut o recovery. sg6 842 j is av ailab l e in a n 8 - pi n dip o r s o p packa g e. typical applicat ion http://
produc t specifica tion highly-inte g r a te d green-mode p wm contr o ller SG6842J ? s y ste m g e ner a l co rp . - 2 - www . s g . co m . t w v e r sio n 1 .4 ( i a o 3 3 .00 15 . b 4 ) feb . 13 , 2006 marking diagrams pin configuration ordering information part num ber otp latch packag e SG6842Jlsz y es 8-pin sop (l ead free ) SG6842Jld z y es 8-pin dip (lead free ) SG6842Jcsz no 8-pin sop (lead free) SG6842Jcd z no 8-pin dip (lead free ) pin des c riptions pin no. symbol fun c tion de scriptio n 1 gnd ground ground. 2 fb feedback the signal from the exte rnal com pensation circuit is fed into th is pin. the pwm dut y cycle is determined in response to the signal from this pi n and the current-sense signal from pin 6. if fb voltage exceeds a threshold, the internal prot ection circuit will di sable pwm output after a predetermined delay time. 3 vin start-up input for start- up, this pin is pulled hig h to the rect ified line input via a resistor. since th e start-up current req u irem ent of the sg68 42j is ver y sm all, a large start-up resistance can be used to minimize pow er loss. under norm a l operation, this pin is also used to detect the line voltage. as a result, constant output po w e r limit over a universal ac input range can be achieved. 4 ri reference setting a resistor connected from the ri pin to g nd pin w ill provide the sg 6842j w i th a constant current source. this determines the center pw m frequenc y. in creasing the resistance w ill reduce pwm fre quenc y . using a 26k ? r e sistor r i results in a 65khz center pwm fr equenc y . 5 rt temperature detection for over -tempe ra ture pro t ection. an exte rnal nt c t hermistor is connected from this pin to gn d pin. the impedan ce of the n t c w i l l decrease at hig h temperat ures. once the voltage of the r t pin dr ops below a fix ed limit , pwm output w ill be disabled. 6 sense current sense current sense. the sensed voltag e is u s ed for peak-current-m ode control and cy cle- b y -c y c le cur r ent limiting. 7 vdd power supply pow e r suppl y . if vdd ex ceeds a threshold, the internal protectio n circuit w ill di sa ble pwm output. 8 gate driver out put the totem - pole o u tput driver fo r the power mosfet. it is internally clamped below 18v SG6842J ftp xxxxx xxy y wwv f: l = otp la tch, c = ot p auto -rec ove ry t : d = dip, s = sop p : z =lea d free + rohs co m p atib le null=re gula r packa g e x xxx xxx : w a f e r lo t yy : year; ww : w e ek v : assem b ly lo catio n ri vi n ga te vd d sense rt gn d fb
produc t specifica tion highly-inte g r a te d green-mode p wm contr o ller SG6842J ? s y ste m g e ner a l co rp . - 3 - www . s g . co m . t w v e r sio n 1 .4 ( i a o 3 3 .00 15 . b 4 ) feb . 13 , 2006 block diagram
produc t specifica tion highly-inte g r a te d green-mode p wm contr o ller SG6842J ? s y ste m g e ner a l co rp . - 4 - www . s g . co m . t w v e r sio n 1 .4 ( i a o 3 3 .00 15 . b 4 ) feb . 13 , 2006 absolute maximum ratings symbol parame ter test conditio n value unit v dd suppl y voltage 25 v v in input te rminal 30 v v fb input voltage to fb pin -0.3 to 7v v v sen se input voltage to sense pin -0.3 to 7v v v rt input voltage to rt pin -0.3 to 7v v v ri input voltage to ri pin -0.3 to 7v v p d pow e r dissipation at t a < 5 0 c dip sop 800 400 mw r j- a thermal resistance junction-air dip sop 82.5 141 c/w t j operating junction temperature -40 to +125 c t st g storage t emper ature ran ge -55 to +150 c t l lead tempe r atu r e (soldering) 10 sec dip 10 sec sop 260 230 c *all vo ltage values, except differen t ial volt ages, are given w i th respe c t to gnd pin. * stresses be y o n d those listed under "absolute ma xi mum ratings" ma y cause perm anent damage t o the device. recommended operating junction temperat ure : -30c ~ 85c* *for pr oper o per ation electrical characte r ist i cs (vdd = 15v, t a = 25c, unless noted) vdd se ction symbol param e ter test conditio n min. typ. max. unit v op continuousl y operating voltage 22 v v th- o n turn -on th reshold voltage 15.5 16.5 17.5 v v th - o f f turn -off voltage 9.5 10.5 11.5 v i dd-st start-up cur r ent v dd = 15v, r i = 26 k gate w i th 1n f t o gnd 30 ua i dd-op oper ating supply cu rrent gate op en 4 5 ma v dd-ovp v dd over voltag e protection 23.2 24.2 25.2 v t vdd-o v p v dd o v p d e bo un ce t i m e r i = 2 6 k 100 usec ri section symbol param e ter test conditio n min. typ. max. unit ri nor r i ope r ating ra nge 15.5 36 k ri max max . r i value fo r protection 230 k ri min min. r i value for protection 10 k
produc t specifica tion highly-inte g r a te d green-mode p wm contr o ller SG6842J ? s y ste m g e ner a l co rp . - 5 - www . s g . co m . t w v e r sio n 1 .4 ( i a o 3 3 .00 15 . b 4 ) feb . 13 , 2006 oscillator section symbol parame ter test conditio n min. typ. max. unit center frequ ency 62 65 68 f os c normal pwm fr equenc y jitter range r i = 26k 3.7 4.2 4.7 khz t jtr jittering period r i = 26k 3.9 4.4 4.9 ms f os c-g-m i n green-mode min. frequency r i = 26k 18 22 25 khz f dv freque nc y variat ion versus v dd deviation vdd = 11.5v to 20v 5 % f dt freque nc y variat ion versus temp . deviation t a = - 30 to 85 5 % feedback input section symbol param e ter test conditio n min. typ. max. unit a v fb input to curr e n t compara tor at tenuation @gr een mode 1/4.5 1/4 1/3.5 v/v z fb input impedance 4 7 k v hgh output high voltage fb pin open 5.5 v v fb -ol fb open-loop t r ig ger level 5 5.4 v t lp s fb open-loop p r otection dela y r i = 26k 50 56 62 ms v n gree n-mode en t r y fb voltage 1.9 2.1 2.3 v v g gree n-mode en d i ng fb voltage v n -0.6 v n -0.5 v n -0.4 v f g - t est burst-mode test freque nc y v g +20mv f os c-g-m i n +0.5 khz i ze ro pwm of f fb v o ltage 1.5 ma current sense section symbol param e ter test conditio n min. typ. max. unit z cs input impedance 12 k v th 8 0 threshold voltag e for curr ent limit i vin = 80ua, r i = 26k 0.81 0.84 0.87 v v t h 160 threshold voltag e for curr ent limit i vin = 160ua, r i = 26k v t h 80 -0.085 v t h 80 -0.07 v t h 80 -0.055 v t pd propagation del a y to gate outp ut 100 200 ns t le b leading edge blanking time 260 360 460 ns v slo p e slope compensa t ion sense=2k , dut y = dc y max 0.34 0.37 0.41 v
produc t specifica tion highly-inte g r a te d green-mode p wm contr o ller SG6842J ? s y ste m g e ner a l co rp . - 6 - www . s g . co m . t w v e r sio n 1 .4 ( i a o 3 3 .00 15 . b 4 ) feb . 13 , 2006 gate section symbol parameter test conditio n min. typ. max. unit dc y max maximum dut y c y cle 80 85 90 % v ol output voltage low v dd =15v, i o = 50ma 1.5 v v oh output voltage h i gh v dd =12v, i o = 5 0 ma 8v v t r rising time v dd =15v, c l = 1 nf 150 250 350 ns t f fal l ing time v dd =15v, c l = 1nf 30 50 90 ns i o peak output c urrent v dd =15v, gate=6v 230 ma v clam p gate output clamping voltage vdd = 22v 18 19 v rt section symbol param e ter test conditio n min. typ. max. unit i rt output current of rt pin r i = 26k 67 70 73 ua v ot p - stop trigger voltage for over-temperature protection 1.015 1.05 1.085 v t ot p - l a t c h over-t emperat ur e latch-off de bo unce. r i = 26k ,v rt <0 . 7 v 60 100 140 us
product sp ecifica tion highly-inte g r a te d green-mode p wm contr o ller SG6842J ? s y stem g e ner a l corp . - 7 - www . s g . co m . tw v e r s io n 1 .4 ( i a o 3 3 .00 15 . b 4 ) feb . 1 3 , 2006 typical characteristics s t a r t- u p c u r r e n t ( i d d s t) v s te m p e r a t u r e 10. 000 12. 000 14. 000 16. 000 18. 000 20. 000 - 4 0 - 25 - 10 5 20 35 5 0 65 80 9 5 110 125 t em p er at u r e ( ) i d d s t ( u a ) opera t i o n c u r r e n t (i d d o p ) v s t e m p e ra t u re 2. 5 00 3. 0 00 3. 5 00 4. 0 00 4. 5 00 5. 0 00 - 40 - 25 - 1 0 5 20 3 5 50 65 8 0 95 11 0 1 25 t e m p e r at u r e ( ) i d d op ( m a ) o n t hr e s hol d v ol t a ge ( v t h on) v s t e m pe r a t ur e 16. 0 16. 2 16. 4 16. 6 16. 8 17. 0 - 40 - 25 - 10 5 20 35 50 65 80 95 110 125 t em p er at u r e ( ) v t h on ( v ) p w m frequency (fosc) vs t e m pe r a t ur e 64. 000 64. 400 64. 800 65. 200 65. 600 66. 000 - 40 - 25 - 1 0 5 20 35 50 65 80 95 110 125 t em p er at u r e ( ) f o sc ( k h z) v dd vs i dd 0 5 10 15 20 25 0 2 4 6 8 1 0 12 14 16 v dd ( v ) i dd ( u a ) ri voltage (vri) vs temp e r a tu r e 1. 200 1. 250 1. 300 1. 350 1. 400 - 40 - 25 - 10 5 20 35 50 65 80 95 110 125 t em p er at u r e ( ) vr i (v)
product sp ecifica tio n h i g h l y - in t e g r a t e d g r e e n - m o d e pw m c o n t r o l l e r s g 6842j ? s y stem g e n e r a l co rp . - 8 - w w w . sg. c o m . t w v e r sio n 1 . 4( iao 3 3 . 00 15 . b 4 ) f e b . 13 , 2 006 max . d u t y (d c y ) v s t e m p e ra t u re 70. 000 74. 000 78. 000 82. 000 86. 000 90. 000 - 40 - 25 - 10 5 20 35 50 65 80 95 110 125 t em p er at u r e ( ) dc y ( % ) votp,stop v s te m p e r a tu r e 1. 000 1. 020 1. 040 1. 060 1. 080 1. 100 - 40 - 25 - 10 5 20 35 50 65 80 95 110 125 t e m p er at u r e ( ) vo t p -l a t c h -o f f (v) output curre n t o f p i n r t ( i r t) v s te m p e r a tu r e 60. 000 64. 000 68. 000 72. 000 76. 000 80. 000 - 40 - 25 - 10 5 20 35 50 65 80 95 110 125 t em p er at u r e ( ) i r t ( u a ) green- m o d e m i n . f r e q u e n c y v s te m p e r a tu r e 0. 000 5. 000 10. 000 15. 000 20. 000 25. 000 - 4 0 - 25 - 10 5 20 35 50 65 80 95 110 125 t em p er at u r e ( ) f o se - g r e e n ( k h z) of f t hr eshol d v ol t age ( v t h o f f ) v s t em p er at u r e 9. 6 9. 8 10. 0 10. 2 10. 4 10. 6 10. 8 11. 0 - 40 - 25 - 10 5 20 35 50 65 80 95 110 125 t em p er at u r e ( ) v t h o ff ( v ) v s e nse vs iv in 0. 4 4 0. 4 9 0. 5 4 0. 5 9 0. 6 4 0. 6 9 0. 7 4 0. 7 9 0. 8 4 0. 8 9 0 40 80 120 160 200 240 280 320 360 iv in (u a) vs e ns e ( v )
product sp ecifica tio n h i g h l y - in t e g r a t e d g r e e n - m o d e pw m c o n t r o l l e r s g 6842j ? s y stem g e n e r a l co rp . - 9 - w w w . sg. c o m . t w v e r sio n 1 . 4( iao 3 3 . 00 15 . b 4 ) f e b . 13 , 2 006 operation description start-up current th e typ i cal start-up cu rren t is o n l y 8u a. th i s allo ws a high resistance, low-wattage st art-up resist or to be used, t o m i nim i ze powe r l o ss. a 1. 5 m , 0.25w , star t- up resi st or an d a 1 0 u f / 2 5v v d d hol d- u p capaci t o r wo ul d be su fficien t fo r an ac/ d c adap ter with a un iv ersal in pu t ran g e. operating current the re qui re d o p erat i n g c u rre nt has bee n re duce d t o 4m a. this res u lts in higher efficiency a n d reduces t h e vdd hold-up capacitance re qui rem e nt. green-mode operation th e pr op r i etar y gr een - m o de fu n c tion pr ov id es of f-t i m e m odul at i on t o c o nt i n u o u sl y dec r ea se t h e p w m freq u e n c y u n d e r ligh t -l o a d co nd itio ns. to avo i d aco ustic-no i se prob lem , th e minim u m pwm fre quency set abo v e 20kh z. th is gr een- m o d e fu n c tion d r am atical ly red u ces p o w e r co ns um pt ion u n d er l i ght -l oa d an d zer o- lo ad cond itio n s . pow e r supp lies u sing a sg6 842 j cont roller can easily m eet even the m o st restrictive in tern ation a l regu latio n s reg a rd ing stand b y po wer con sum pt i on. oscillator operation a resi st or c o n n ect ed fr om t h e r i pi n t o g nd pi n gene rates a c o n stant cu rre n t sou r ce fo r t h e s g 68 4 2 j co n t ro ller. th i s curren t is u s ed to d e term in e th e cen ter pw m frequ ency. in creasi n g th e resistan ce will red u c e pw m f r e qu ency. u si n g a 26k resistor r i resu lts in a cor r es po n d i n g 65 k h z p w m f r eq ue ncy . t h e rel a t i ons hi p bet w ee n r i and th e switch i ng frequ en cy is: (khz) ) (k r i ? = 1690 pwm f -- -- -- -- -- -- -- --- -- -- -- -- -- - (1 ) sg6 842 j also i n tegrates frequen c y j ittering fu n c tion i n t e rnal l y . t h e f r eq ue ncy var i at i on ran g es f r om aro u n d 6 1kh z to 69 khz fo r a cent e r freque ncy 65khz. t h e freq u e n c y j itterin g fu n c tion h e lp s redu ce emi em issio n of a po wer sup p l y with m i n i m u m lin e filters. 26 70 ? ? = ) (k r i ua rt i -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -( 2) leading edge blanking each tim e th e po wer m o sfet is switch e d o n , a tu rn -o n sp i k e will in ev itab l y o ccur at th e sen s e-resistor. to a voi d prem at ure t e rm i n at ion o f t h e swi t c hi n g pul se, a lead in g-ed g e b l ank i ng tim e is bu ilt in . du ring t h is bl an ki n g pe ri o d , t h e cu rre nt -l im it com p arat o r i s di sa bl ed , an d it cann o t switch o f f th e gate d r i v e. under-voltage locko ut (uvlo) the tur n -o n/tu rn -o ff th res hol ds are fi xed in ternally at 1 0 .5v / 16 .5v . to en ab le a sg68 42 j con t ro ller dur ing start-up , th e ho ld-up cap acito r m u st first be ch arg e d t o 16 .5 v t h r o ug h t h e st art - u p re s i st or. th e h o l d - up cap acito r will con tin u e to sup p l y vdd b e fo re en erg y can b e d e liv ered fro m th e aux iliary wind ing o f th e m a in tr an sfor m e r . v d d m u st n o t dr op b e l o w 10 .5 v d u r i ng t h is st ar t- up pr o c es s. th is u v lo h y st e r e sis wi n d o w e n s u re s t h at t h e hol d- up ca paci t o r ca n ade q uat e l y su ppl y vd d d u ri ng st art - up . gate outp ut / sof t dr iving th e sg 684 2j bicmo s o u t pu t stage is a fa st tote m pol e gat e dri v er. c r oss-c o nd uct i o n has bee n a v oi de d t o m i nim i ze heat di ssi pat i o n, increase efficiency, and en h a n c e reliabilit y. th e ou tpu t d r i v er is clam p e d b y an i n t e rnal 18 v zener di o d e i n or der t o pr ot e c t t h e p o we r m o sfe t t r a n si st ors fr om any harm ful o v er -v ol t a ge gat e sig n a ls. a soft driv ing waveform is i m p l e m en ted to min i mize e m i . slope compensation the sense d vol t age across th e curre nt se nse resistor i s used f o r pea k -c ur re nt -m ode cont rol a n d c y cl e-by -cy c l e cu rren t limiti n g . th e bu i lt-in slo p e co m p en satio n
product sp ecifica tio n h i g h l y - in t e g r a t e d g r e e n - m o d e pw m c o n t r o l l e r s g 6842j ? s y st e m g e n e r a l c o r p . - 1 0 - w w w . sg . c o m . t w v e r sio n 1 . 4( iao 3 3 . 00 15 . b 4 ) f e b . 13 , 2 006 function im p r o v e s po wer sup p l y stab ility an d p r ev en ts peak -c ur rent - m ode cont rol fr om causi ng su b- harm oni c o s cillatio n s . with in ev ery sw itch i n g cycle, th e sg6 842j co n t ro ller prod u c es a po sitiv ely slop ed, syn c hron ized ram p si gnal . constant output pow e r limit w h en th e sen s e vo lta g e ac r o ss th e s e nse r e si st or r s reaches the thres hol d voltage, t h e output gate dri v e will b e tu rn ed o f f fo llo wi n g a sm a ll p r o p a g a t i o n d e lay t pd . th is p r op ag ati o n d e lay will resu lt in an ad d i tio n a l cu rren t pr o p o rti onal t o t pd *v in /l p . th e pr op ag atio n d e lay is n early con stant reg a rd less of th e inp u t lin e vo ltag e v in . high er i n pu t lin e v o ltag e s wi ll resu lt in larger add itio n a l cu rren ts. th us, un d e r h i gh i n p u t -lin e v o ltages th e ou tpu t p o wer limit will b e h i gh er th an un d e r low inpu t-lin e vol t a ge s. th e ou tpu t power li m it v a riatio n can b e si gn ifican t ove r a wi de ra nge of ac i n p u t v o l t a ges. t o com p ensat e for t h is, th e thresho l d vo ltage is adj u sted by th e curren t i in . sin ce th e pin vin is connected to th e rectified in pu t lin e vo ltag e throug h th e start - up resistor, a h i g h e r lin e v o ltag e will resu lt in a h i gh er cu rren t i in thro ugh th e p i n vi n. the t h res h ol d v o l t a ge dec r e a ses i f t h e cu rre nt i in in creases. a small th resho l d v o ltag e will force th e o u t p u t gate d r i v e t o term in ate earlier, t h us red u c i n g to tal p w m t u r n - o n t i m e , and m a ki ng t h e out put p o w er eq ual t o th at o f th e low lin e i n pu t. th is prop rietary in tern al com p ensat i o n feat ure e n s u re s a co nst a nt o u t p ut po we r l i m i t ove r a wide ra nge of a c i n put v o l t a g e s ( 9 0v ac t o 26 4 vac ). vdd over-voltage protection vdd ov er-vo l tag e pro t ection has b een built in to p r ev en t d a m a g e d u e to o v e r vo ltag e cond ition s. when t h e voltage vdd exceeds the internal thre shold due t o ab norm a l co n d itio n s , pwm ou tpu t will be tu rn ed off. ov er-vo ltag e co nd itio ns are u s u a lly cau sed b y o p e n feedbac k loops . limited pow e r control th e fb v o ltage will in crease ev ery tim e th e ou tpu t of t h e p o w er s u p p l y i s sh ort e d or ove r-l oad e d. i f t h e fb v o ltag e rem a in s h i gh er t h an a b u ilt-in t h reshold fo r long er th an t lps , pwm ou tpu t will th en b e t u rn ed o f f. as pwm o u t p u t is turn ed o f f, th e su pp ly vo ltag e vdd will also begi n decreasi n g . w h en vdd go es b e lo w th e tu rn -o ff th r e sho l d ( e g , 1 0 .5v) th e contro ller will b e to tally sh u t do wn . vdd will be cha r ge d up t o t h e t u r n -o n t h res hol d v o l t a ge o f 1 6 . 5 v th ro ugh th e start-up resisto r un til pw m ou tpu t is restarted . th is pro t ection feature will co n tinu e to b e activ ated as lo ng as th e ov er-lo a d i ng con d ition p e rsist s. th is will p r ev en t th e p o wer su pp ly from o v e rh eatin g du e to ov er lo ad ing con d itio ns. protection latch circuit for th e sg6 842 j fam i l y , th e b u ilt-in latch fu n c tion p r ov id es a v e rsatile p r o t ectio n feat u r e t h at d o e s n o t req u ire e x tern al com p o n ents . s ee o r de rin g in fo rm ation for a d e tailed d e scri p tio n. to reset th e latch circu it, it is n ecessary to d i scon n ect th e ac lin e vo ltag e o f th e p o wer su ppl y . thermal protection an ex tern al ntc th erm i sto r can be c o nnect ed from th e rt p i n to gr oun d. a f i x e d cu rr en t i rt is so ur ced fro m the rt pi n. because the i m pedance of the ntc will decrease at hi gh tem p eratures , when th e vo ltag e o f th e rt p in dro p s b e low 1 . 06 5v, pwm ou tpu t will b e d isab led . the r t pi n out put c u r r ent i s rel a t e d t o t h e p w m fre que ncy pr o g r am m i ng resi st or r i noise immunit y noise from th e current se ns e or the c o ntrol signal may cau se sign ifican t pu lse wi d t h j itter, particu l arly in co n tinuo us- c on du ction m o d e . slop e co m p en sation h e l p s alleviate this problem . good placem en t and layout pract i ces sh o u l d be fol l o wed. the de si gne r sh o u l d avoi di n g l o n g pc b t r ace s an d com pone nt l eads . com p ensation and filter com ponents s h ould be located n ear th e sg684 2j. fin a lly, increasi n g t h e powe r-m os gate resista n ce is advised.
product sp ecifica tio n h i g h l y - in t e g r a t e d g r e e n - m o d e pw m c o n t r o l l e r s g 6842j ? s y st e m g e n e r a l c o r p . - 1 1 - w w w . sg . c o m . t w v e r sio n 1 . 4( iao 3 3 . 00 15 . b 4 ) f e b . 13 , 2 006 package information 8pins-dip(d) 4 1 8 5 d e1 e e b a1 a2 a b b1 l e dimensions millimeters inches symbol min. typ. max. min. typ. max. a 5.334 0.210 a1 0.381 0.015 a2 3.175 3.302 3.429 0.125 0.130 0.135 b 1.524 0.060 b1 0.457 0.018 d 9.017 9.271 10.160 0.355 0.365 0.400 e 7.620 0.300 e1 6.223 6.350 6.477 0.245 0.250 0.255 e 2.540 0.100 l 2.921 3.302 3.810 0.115 0.130 0.150 eb 8.509 9.017 9.525 0.335 0.355 0.375 ? 0 ? 7 ? 15 ? 0 ? 7 ? 15 ?
product sp ecifica tio n h i g h l y - in t e g r a t e d g r e e n - m o d e pw m c o n t r o l l e r s g 6842j ? s y st e m g e n e r a l c o r p . - 1 2 - w w w . sg . c o m . t w v e r sio n 1 . 4( iao 3 3 . 00 15 . b 4 ) f e b . 13 , 2 006 8pins-sop(s) 1 4 8 5 h e e b a a1 d c f l dimensions millimeter inch symbol min. t yp . max. min. t yp .m a x. a 1.346 1.752 0.053 0.069 a1 0.101 0.254 0.004 0.010 b 0.406 0.016 c 0.203 0.008 d 4.648 4.978 0.183 0.196 e 3.810 3.987 0.150 0.157 e 1.016 1.270 1.524 0.040 0.050 0.060 f 0.381x45 0.015x45 h 5.791 6.197 0.228 0.244 l 0.406 1.270 0.016 0.050 ? 0 8 0 8
produc t specifica tion highly-inte g r a te d green-mode p wm contr o ller SG6842J ? s y stem g e ner a l cor p . - 1 3 - w w w .s g.c o m . t w versi o n 1.4(i a o33. 0015.b 4) feb. 13, 2006 disclaim ers life support sy st em genera l ? s pr o duct s a r e not de si g n ed t o be use d as co m ponent s i n de vi ces i n t e n d ed t o su pp o r t or s u st ai n h u m a n l i f e. use o f sy st em gene ral ? s p r od uct s i n c o m ponent s i n t e nde d f o r s u r g i c al im pl ant i n t o t h e bo dy , o r ot her a ppl i cat i o n s i n whi c h fai l u re of sy st em general ? s pr od uc t s co ul d c r eat e a si t u at i o n w h ere pe rs onal deat h o r i n j u r y m a y occur , i s n o t au tho r ized with ou t t h e exp r ess written app r ov al o f system ge n e ral?s ch ief ex ecu tiv e officer. system gen e ral will no t b e hel d l i a bl e f o r any dam a ges o r cl ai m s resul t i ng f r om t h e u s e o f i t s p r od uct s i n m e di cal ap pl i cat i ons. military syste m gen e ral's p r o d u c ts are no t d e sign ed fo r u se in m ilitary ap p licat io n s . use of syste m gen e ral?s pro d u c ts in mil itary ap p licatio n s is no t auth orized withou t th e exp r e ss written app r oval o f system gen e ral?s c h ief ex ecu tiv e officer. syste m gen e ral will no t b e h e ld liab l e for an y d a m a g e s or claim s resu ltin g fro m th e u se of its pro d u c ts i n m i l i t a ry ap p licatio ns. right to make changes sy st em genera l reserve s t h e r i ght t o c h an ge t h i s doc um ent and/ or t h i s pr o duct wi t h o u t n o t i ce. c u st om ers are a dvi se d to con s u lt th eir system gen e ral sales rep r esen tativ e b e fo re o r d e ri n g .

▲Up To Search▲

Price & Availability of SG6842J

	To Download SG6842J Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .