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delphi nd series non-isolated point of load dc/dc power modules: 12v i n, 0.9v~3.63v out, 50aout the del phi nd serie s , 12 v input, singl e output, non -isol a ted poi n t of load (pol ) dc/dc conve r ters a r e the latest of fering from a world le ader in powe r syst ems technol o g y and manu facturin g ? delt a ele c tro n ics, inc. the nd/ne produ ct f a mily is the seco nd g ene ration, non -iso lated point-of - loa d dc/dc po wer mo dule s for the dat acom/n etwo rking/it appli c ation s and it will help to cut the module size by 35% to 50% com p a r ed to the first g ene ration nc se ries po l mo d u les. th e nd/ne prod uct famil y provides 6 a to 60a of output curre n t in a vertically or hori z ont ally mounted th rough -hol e p a ckag e and the output can be resi sto r trimmed from 0.9vdc to 3.63vdc. it provides a very cost ef fective, high ef ficien cy , and high d e n s ity point of load sol u tion. with cre a tive de si gn tech nolo g y and optim ization of co m pone nt place m ent, these conv erters po ssess out st an ding elect r i c al and thermal perfo rman ce, as well as e x tremely hi gh reliability under highly stressful operating con d itions. optio n negative on/of f logic applica t i o ns dat a com distributed po w e r architectures servers and w o r kst ations lan/w a n applications dat a processing applications featur es high ef ficiency : 93% @ 1 2 v i n, 3.3v/50a out size: 61.0x31.8 x 10.2mm (2.40?1.2 5?0.4 0?) v o lt age and resistor-based t r im no minimum load required output volt age pr ogrammable f r o m 0.9vdc to 3.63vd c via external res i stors fixed f r equenc y operation single-in line p a ckage (sip) input uvl o , out put ocp , otp , s c p remote o n /o ff ( p ositive) power goo d outp u t signal (open collector) output volt age s ense iso 9001, t l 90 00, iso 14 001, qs9000, o h sas1800 1 certified manufactu ring facility ul/cul 60950 ( u s & canada ), t u v (en60950 ) - - pen ding prelimin a r y d a t a s h ee t d s _ n d1 2 s 5 0 a _030 82 00 7
ds_nd 12s 10 a_03 08 200 7 2 technical specifica t i o ns ( a m b ien t t e mp erature=25 c, m i nim u m air f lo w = 200lfm, no min a l v in =12vdc u n l ess ot her w ise s p ecifie d .) pa r a m e t e r notes and co nditio n s nd12s0 a 0v 50 (s t a nd ard ) m i n . t y p. max. unit s a b solute m a xi mu m ra tings inpu t v o lt ag e -0.3 13.8 vdc operati ng t e mpera t ure (v e r ti cal) w i th ap propria te air flow and dera t ing , see fig . 32 0 124 c s t orage t e mperatu r e -40 125 c inpu t/ou t pu t isola t i on v o lt age non-isola t ed na v input cha r a c teristics operati ng inpu t v o l t age 10.2 12.0 13.8 v inpu t under -v ol t a g e lo cko ut t u rn-on v o l t age th reshold 8.5 9.0 9.5 v t u rn-o f f v o lt age th reshold 7.1 7.6 8.1 v lockout hy stere s is v o lt age 1.4 v max i mu m inpu t cur r ent 100% lo ad, 10 .2v i n, 3 . 3 v ou t 24 a no-load inpu t curr ent v i n=12v , v o ut=3 .3 v 250 ma of f conv erter inpu t current remote off 15 30 ma inpu t re flected-rip p le curren t refer to figure 31. 20 ma inpu t ripple reje cti on 120hz 60 db output ch a r a c teri sti c s outpu t v o lt age adj u stmen t range 0.9 3.63 v outpu t v o lt age set point w i th a 1 . 0% trim re sistor -2 +2 % outpu t v o lt age reg u lation ov er load io=io_min to io_ma x -1 +1 % ov er line vi n = vi n _ m i n t o vi n _ m a x -0.2 +0. 2 % t o t a l ou tput ran g e ov er load, l i ne, temperature reg u lati on and set poin t -3 +3 % outpu t v o lt age rip p le and noise 5hz to 20mhz ban dw id th peak- t o-pe ak full load , 1uf cera mic, 10uf t an cap and 4 * 680uf osc o n 25 50 v o rms full load , 1uf cera mic, 10uf t an cap and 4 * 680uf osc o n 5 15 mv outpu t cur r ent ran ge 0 5 0 a outpu t v o lt age ov e r-shoo t at s t ar t-up v i n=12v , t u rn on 2 % outpu t v o lt age und e r-shoo t at pow e r-of f v i n=12v , t u rn off 100 mv outpu t dc cur r ent- l imit in ception hiccup mode 1 10 200 %iomax dyn a m i c ch a r a c teri sti c s outpu t dy namic lo ad resp onse 12v in, 1uf cer a mic, 10 uf t an cap and 4*6 80uf o s con posi tiv e s t ep chan ge in ou tput curre nt 37.5 a to 25a, 10a /us 75 mv negativ e s t ep cha nge in ou tpu t curr ent 25a to 37 .5a, 10a /us 75 mv settling t i me settling to be w i thin regula t ion band ( t o 10% v o dev iation) 50 s t u rn-on t r an sien t s t art-up t i me, from on /o f f contr o l from enable high to 90% o f v o 10 ms s t art-up t i me, from inpu t pow er from v i n=12v to 9 0 % o f v o 10 ms minimum output c a p a cit a n c e ex : one o s con 6 . 3v/680uf (esr=13 m ? max ) 680 f max i mu m outpu t s t artup cap a civ e lo ad full load 3000 f minimum inpu t cap a cit a n c e 0 f effi ci ency vo = 0 . 9 v v i n=12v , io=50 a 82.5 % v o =1.2 v v i n=12v , io=50 a 8 5 . 5 % vo = 1 . 5 v v i n=12v , io=50 a 87.5 % v o =1.8 v v i n=12v , io=50 a 8 9 . 0 % vo = 2 . 5 v v i n=12v , io=50 a 91.5 % v o =3.3 v v i n=12v , io=50 a 9 3 . 0 % vo = 3 . 6 3 v v i n=12v , io=50 a 93.3 % fe a t ure ch a r acteri s ti cs sw itching freq uen cy fi x ed 300 khz on/ o ff control posi tiv e logic (in t er nally pulled high) l ogic high module on (or leav e th e pin open ) 2.4 v i nmax v l ogic low module o f f -0.2 0.8 v genera l specifica t ions calcula t ed mtbf t e lcordia sr-332 issue1 method 1 ca se3 a t 50 c tbd mhours we i g ht 34.2 grams ov er-t emperature shut dow n 134
ds_nd 12s 10 a_03 08 200 7 3 electri cal characteristi cs cur ves 70 75 80 85 90 95 5. 01 10 15 20 25 30 35 40 45 50 out p ut curre nt (a ) ef f i ci ency ( % ) 10. 2 12. 0 13. 8 70 75 80 85 90 95 5. 01 10 15 20 25 30 35 40 45 50 out p ut curre n t (a ) ef f i ci ency ( % ) 10. 2 12. 0 13. 8 figure 1 : converter ef ficie n c y vs. output current (0.9v outp u t volt age) figure 2 : converter ef ficie n c y vs. output current (1.2v outp u t volt age) 70 75 80 85 90 95 5. 01 10 15 20 25 30 35 40 45 50 out p ut curre n t (a ) efficiency (%) 10. 2 12. 0 13. 8 70 75 80 85 90 95 100 5. 01 10 15 20 25 30 35 40 45 50 out p ut curre nt (a ) efficiency (%) 10. 2 12. 0 13. 8 figure 3 : converter ef ficie n c y vs. output current (1.5v outp u t volt age) figure 4 : converter ef ficie n c y vs. output current (1.8v outp u t volt age) 70 75 80 85 90 95 100 5. 01 10 15 20 25 30 35 40 45 50 out p ut curre nt (a ) ef f i ci ency ( % ) 10. 2 12. 0 13. 8 70 75 80 85 90 95 100 5. 01 10 15 20 25 30 35 40 45 50 out p ut curre nt (a ) ef f i ci ency ( % ) 10. 2 12. 0 13. 8 figure 5 : converter ef ficie n c y vs. output current (2.5v outp u t volt age) figure 6 : converter ef ficie n c y vs. output current (3.3v outp u t volt age)
ds_nd 12s 10 a_03 08 200 7 4 electri cal characteristi cs cur ves (con.) figure 7 : outp ut rippl e & nois e at 12v i n , 0.9 v /50a o u t figure 8 : outp ut rippl e & nois e at 12v i n , 1.2 v /50a o u t figure 9 : outp ut rippl e & nois e at 12v i n , 1.5 v /50a o u t figure 1 0 : output ripp le & no i s e at 12v i n , 1.8v/50a out figure 1 1 : output ripp le & no i s e at 12v i n , 2.5v/50a out figure 1 2 : output ripp le & no i s e at 12v i n , 3.3v/50a out
ds_nd 12s 10 a_03 08 200 7 5 electri cal characteristi cs cur ves (con.) figure 1 3 : t u rn on de lay ti me at 12v in, 0.9v/ 50a o u t ch1: v out ch 4: v i n figure 1 4 : t u r n on delay tim e remote on/of f, 0.9v/50a out ch1: v out ch 4: enabl e figure 1 5 : t u rn on de lay ti me at 12v in, 3.3v/ 50a o u t ch1: v out ch 4: v i n figure 1 6 : t u r n on delay tim e at remote on/of f, 3.3v/50a out ch1: v out ch 4: enabl e figure 1 7 : t y pical trans ient re spons e to step loa d cha nge at 10a/s from 5 0 %to 75 % an d 75% to 50 of io, max at 12v in, 0.9v out figure 1 8 : t y pical trans ient re spons e to step loa d cha nge at 10a/s from 5 0 %to 75 % an d 75% to 50 of io, max at 12v in, 1.2v out
ds_nd 12s 10 a_03 08 200 7 6 figure 1 9 : t y pical trans ient re spons e to step loa d cha nge at 10a/s from 5 0 %to 75 % an d 75% to 50 of io, max at 12v in, 1.5v out figure 2 0 : t y pical trans ient re spons e to step loa d cha nge at 10a/s from 5 0 %to 75 % an d 75% to 50 of io, max at 12v in, 1.8v out figure 2 1 : t y pical trans ient re spons e to step loa d cha nge at 10a/s from 5 0 %to 75 % an d 75% to 50 of io, max at 12v in, 2.5v out figure 2 2 : t y pical trans ient re spons e to step loa d cha nge at 10a/s from 5 0 %to 75 % an d 75% to 50 of io, max at 12v in, 3.3v out
ds_nd 12s 10 a_03 08 200 7 7 design considera t ions the nd 5 0 a use s two pha se a nd volt ag e mode co ntrolle d buck top o logy . the outp u t can be trim m ed in the ra n ge o f 0.9vdc to 3.6 3 vdc with a resi stor from t r im pin to gro und. a remote se nse fun c tion is provide d and it is able to comp en sate for a d r o p from the o u tp ut of co nvert e r to point of load. the co nverte r can be turn ed on/off by remote co ntrol. positive on/ of f (enable pin) l ogic implies th at the conve r ter dc output is ena bled when th e sign al is d r ive n high (greate r than 2.4v) or floating and disabl ed whe n the sign al is driv en low (b elo w 0.8v). neg a tive on/of f lo gic is optional. the conve r te r provide s an open colle ctor powe r goo d sign al. the p o we r go od si gnal is pulled low when o u tput i s not within 1 0% of v out or enable is of f . the conve r te r can p r ote c t it self by e n tering hi ccup m ode again s t over curre n t and short ci rcuit co ndition. the conve r te r has an over te mperature prote c tion wh ich can p r ote c t it self by shutting do wn for an ove r temperature event. there is a thermal hystere s is o f typically 20 c safety con s iderations it is re com m ende d that the u s er t o provide a ver y fast-a cting type fuse in the input line for safety . t he o u tput volt age set-p o int and th e output curren t in the appli c ation coul d define t he ampe ra ge rating of the fuse. fea t ures descriptions enabl e (on/off) the enable (on/of f) in put allows external ci rcuitry to pu t the nd co nverter into a low po we r di ssi p a tio n (sle ep ) mode. positiv e enable is available a s st anda rd. positive ena b le unit s of the nd seri e s a r e turned on i f the enable pin is high o r floating. pulling the pin low will turn of f the un it. with the a c tive high fun c t i on, the o u tpu t is guarantee d to turn o n if the enable pi n is d r iven a b o ve 2.4v . the output will turn of f if the enable pin volt age i s pulled b e low 0.8v . the enable i nput can be driven i n a v a riety of ways a s sho w n in fig u re s 23 and 24. if the en able signal come s from the prim ary side of the circuit, the enable can be driven thro ug h either a bi polar sign al tran sisto r (fig ure 23). if the en able si gnal comes from th e se con dary side, then an o p to -co uple r o r o t her isolation device s mu st be use d to brin g the sig nal across the volt age isol ation (plea s e see f i gure 2 4 ). figure 2 3 : enabl e input driv e circuit for nd series figure 2 4 : enable i nput driv e circuit exa m ple w i th isolation.
ds_nd 12s 10 a_03 08 200 7 8 over t e mp erature pro t ection (otp) t o provide a dditional ove r-temp e rature protectio n in a fault conditio n , the unit is equip ped wit h a non-lat c h i ng thermal shu t d o wn circuit. t he shut do wn circuit en gag es whe n the temperatu r e of monitore d com pone nt excee d s approximatel y 125c. th e unit will cycl e on and of f wh ile the fault condition exist s . the unit will recover from shut do wn when the cau s e of the over temperat ure con d ition is removed output v o lt age progra m ming the output volt age of the nd se rie s is trimmable by con n e c ting a n external re sisto r betwe e n the trim pin and output grou n d as sho w n figure 26 and the typical trim resi sto r value s are sho w n i n figure 27. figure 2 6 : t r i m mi ng output v o lt a ge the nd50 module ha s a trim range of 0.9v to 3.6 3 v . the trim re si stor equatio n for the nd50a is: v out is the ou tput volt age setpoint rs i s the re si st an ce b e twe en t r im a nd grou nd rs valu es sh ould not be le ss tha n 3.32 k ? outp ut v o lt ag e rs ( ? ) 0 . 9 v o p e n + 1 .2 v 38.3k + 1 .5 v 18.7k + 1 . 8 v 1 2 . 1 k +2.5 v 6.34k +3 .3 v 3.92k + 3 . 6 3 v 3 . 3 2 k figure 2 7 : t y p i cal trim resistor values fea t ures descriptions (con.) input under-v olt age l ockout the in put un der-volt a g e l o ckout p r eve n t s the c onverte r from being damag ed wh ile operatin g when the inpu t volt age i s to o lo w . the l o ckout o c curs betwe en 7.6 v to 9.0v . over-cu rre nt and short-circuit protection the nd seri es modul es have non-l a tchin g over-curren t and sho r t-circuit prote c tio n circuitry . when over cu rren t con d ition o ccurs, th e mo d u le go es into the no n-lat c hing hiccup mo d e . when t he over-current con d ition is remove d, the module will re sume n o rm al operation. a n over current conditio n is detected by measu r in g the volt age drop acro ss the mosfet s. the volt age d r o p across the m o sfet is al so a fun c tion of the mosf et? s rd s(o n ). rds(on ) is af fect ed by tempe r ature, theref ore ambient temperature will af fect the current limit incept ion point. the d e tectio n of the rds(o n ) of mosf et s also a c t s as an over tem peratu r e p r ot ection sin c e high tempe r a t ure will cause the rds(on) of the mosfet s to increase, eventually triggeri ng ove r -curre nt prote c tion. remote sense the nd50 provide v o rem o te sen s ing to achieve pro per regul ation at the load point s a nd re duce ef fect s of distrib u tion lo sses o n outp u t line. in the event of an open remote se nse line, the m o d u le shall m a int a in local sense regul ation through a n internal re si stor . t he mod u le sh all corre c t for a tot a l of 0.5v of loss. t he remote sense con n e c t s a s shown in figu res 25. figure 2 5 : circuit config urati o n for remote se nse
ds_nd 12s 10 a_03 08 200 7 9 fea t ures descriptions (con.) the output can al so be set by an external volt age con n e c ted to trim pin as sh own in fig u re 28 figure 2 8 : output volt ag e trim w i th volt age source t o use volt ag e trim, the trim equation fo r the nd50 is (plea s e refer to fig.28): v out is the desi r ed outp u t volt age vt is the ex ternal trim volt age rs is the resist ance b e t w e en t r im and ground (in k ? ) rt is the resistor to be defi n e d w i t h the trim volt ag e (in k ? ) belo w is an e x ampl e abo ut u s ing this vo lt ag e trim equati o n : exam pl e: if vt= 1 .25v , de sired v out= 2 .5 v and rs= 1 k ? pow e r good the converte r provid es a n open colle ctor si gnal call ed powe r good. this output pin use s po si tive logic and is open colle cto r . this p o wer good o u tput is ale to si nk 5 m a and set high whe n the output is within 10% of outpu t se t point. the po wer goo d si g nal is p u lled l o w when out put is not within 1 0% of v out or enable is of f . output cap acit ance there is outp u t capa citor o n the nd seri es mod u le s. hen c e, an ex ternal outp u t cap a cito r is required for stable operation. v o lt age margining adjustment output volt ag e m argi n adj usting can b e impleme n ted in the nd m o d u les by con n e cting a re si stor , r ma rgin -u p , from the t r im pin to the groun d for margini n g up the output volt age. also, the output volt age can be adju s ted l o we r b y con n e c t i ng a resi st o r , r ma rgin -d o w n , from th e t r im pin to the volt age sou r ce vt. fig u re 2 9 sh ows the ci rcui t config uratio n for output volt age ma rginin g adju s tment. figure 2 9 : circuit config urati on for outp u t voltag e margi n i n g reflected ripple curre nt and output ripple and noise meas urement the mea s u r e m ent set-u p outlined in fi gure 3 0 has been use d for both input reflect ed/ terminal ripple cu rrent and output volt ag e ripple a n d noise me asurem ent s on nd seri es conve r ters. cs= 270 f * 1, l t est= 1.4uh, ci n= 270 f * 2. co ut= 680uf * 4 figure 3 0 : input reflected rip p le/ cap a c i tor rippl e curre nt and output volt a ge rippl e an d no is e me asur e m en t setup for nd5 0
ds_nd 12s 10 a_03 08 200 7 10 thermal cureves ` figure 3 2 : t e mp eratur e mea s ure m e n t locati on* t h e all o w e d max i mu m h o t s pot t e m per at ure is defin ed at 124 n d 12 s0 a0 v 5 0 ( st an dar d) o u t p ut c u r r ent v s . a m bi e n t t e m per at u r e a nd a i r v e l o ci t y @v i n = 12v v o u t = 0 . 9 v ( t hr oug h p c b o r i e nt a t i on) 0 5 10 15 20 25 30 35 40 45 50 55 25 3 0 3 5 40 4 5 5 0 5 5 60 65 7 0 75 80 8 5 na t u r a l c o n v ect i on o u t p ut c u r r en t ( a ) a m bi en t t em pe r a tu r e ( ) thermal consi d era t i o n therm a l man ageme n t is a n importa nt part of the syst em desi gn. to e n su re p r op er, reliabl e ope ration, suffici e n t cooli ng of th e po we r mod u le is nee de d over th e e n tire temperature range of the modul e. co n v ection co olin g is usu a lly the dominant mo d e of heat tran sfer. hen c e, the choi ce of eq uipment to chara c te rize the thermal p e rf orma nce of the po wer m odule i s a wind tunnel. thermal t esting setup delta? s dc/ dc po we r module s are chara c te rize d in heated verti c al wind tunn els t hat simu late the thermal environ ment s encou ntered in most electroni cs equipm ent. this type of equipm ent comm only u s e s vertically mou n ted circuit card s in cabi n e t rac ks in w h ich the power mo dule s are m o unted. the follo wi ng figure sho w s t he win d tunnel cha r a c teri zati on setu p. th e power mo d u le is mo unt ed on a test pwb and is v e rtically po sit i oned withi n the wind tunn el. the sp ace betwee n the neighb orin g pwb and the top of the power modul e is consta ntly kep t at 6.35mm (0.2 5??). thermal derating heat can b e remove d by increa sing airflow over the module. t o enha nce system reli abi lity, the powe r module sho u l d alway s be operated bel o w the maxim u m operating te mperature. if the tempera t ure exce ed s the maximum module temperat ure, reli ability of the unit may be affected. modu le a ir fl o w 1 1 (0.43 ? ) 50. 8 ( 2 . 0 ?) fa c i n g p w b pw b air vel oc ity an d a m bien t te mper atur e me asu re d bel ow th e mo du l e 22 (0.87 ? ) note: w i nd tunn el test setup figure di mensi ons are in millim eters an d (inches) figure 3 1 : win d tunne l test setup figure 3 3 : output curre nt vs. amb i ent temper ature a nd ai r velocity @v in= 12v , v out= 0 .9 v(t h roug h pc b orient ation) n d 12 s0 a0 v 5 0 ( st an dar d) o u t p ut c u r r ent v s . a m bi e n t t e m per at u r e a nd a i r v e l o ci t y @v i n = 12v v o u t = 2 . 5 v ( t hr oug h p c b o r i e nt a t i on) 0 5 10 15 20 25 30 35 40 45 50 55 25 3 0 3 5 40 4 5 5 0 5 5 60 65 7 0 75 80 8 5 na t u r a l c o nv ec t i o n o u t p ut c u r r en t ( a ) a m b i e n t t e m p er a t ur e ( ) 10 0lf m 200 lf m 300 lf m figure 3 4 : output current vs. ambi ent tempe r ature an d air velocity@ v i n= 12v , v out= 2 .5 v(t h roug h pc b orient ation) 10 0lf m 20 0 l f m
ds_nd 12s 10 a_03 08 200 7 11 thermal cureves n d 12 s0 a0 v 5 0 ( st an dar d) o u t p ut c u r r ent v s . a m bi e n t t e m per at u r e a nd a i r v e l o ci t y @v i n = 12v v o u t = 3 . 3 v ( t hr oug h p c b o r i e nt a t i on) 0 5 10 15 20 25 30 35 40 45 50 55 25 3 0 3 5 40 4 5 5 0 5 5 60 65 7 0 75 80 8 5 na t u r a l c o nv e c t i on o u tp ut c u r r e n t ( a ) a m b i en t t e m p er at u r e ( ) 10 0l fm 200 lf m 40 0lf m 300 lfm figure 3 5 : output current vs. ambi ent tempe r ature an d air velocity@ v i n= 12v , v out= 3 .3 v(t h roug h pc b orient ation) mechanical dra w ing vertical
ds_nd 12s 10 a_03 08 200 7 12 p a rt numbering system model list n d 1 2 s 0 a 0 v 5 0 p n f a produc t series in p u t v o lt ag e number of outp u t s outp ut v o lt ag e mount ing outp ut current on/off logic pin le ngth o p t i o n code nd- non-isolated series 12- 10.2~13. 8v s- single output 0a0 - program mable v - v e rtical 50-50a p- positive n- 0.14 0? f- ro hs 6/6 (lead f r ee ) a - st andard function model name packaging input v o lt ag e outpu t v o lt a g e outpu t cu rr ent efficiency 12v in @ 100 % load nd12s0a0v50p nf a v e rtical 10.2 ~ 13.8vdc 0.9 v ~ 3.63vdc 50a 93% c o nt ac t : www .delt a . com.tw/dcd c us a : t e lepho ne: east coast: (888) 33 5 82 01 w e st coast: (888) 33 5 82 08 f a x: (97 8 ) 656 396 4 email: dcd c @ delt a -c orp.co m europe : t e lepho ne: + 4 1 31 99 8 53 1 1 f a x: + 41 31 9 9 8 53 53 email: d c dc@ d e l t a -e s.tw a s i a & the re st of w o r l d: t e lepho ne: + 8 86 3 45 26 10 7 ext. 62 20 f a x: + 886 3 4 5 134 85 email: dcd c @ delt a .com.t w t w arra nt y delt a of fers a two (2) year limited warran ty . complete warra n ty information is liste d on our web site or is available upo n requ est from delt a. information fu rnished by delt a is beli e ve d to be accurate and reli ab le. however , no re spo n si bi lity is assum e d by delt a for it s u s e, n o r for a n y infrin gement s of p a tent s or oth e r rig h t s of third p a rties, whi c h may result from it s use. no li cen s e is g r anted by implicatio n o r otherwise un der any p a ten t or p a t ent ri g h t s of delt a. delt a re se rve s the right to revise the s e spe c ification s at any time, without noti c e .

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