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sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output applica t ions ? telecommu ni cation s ? data communic a tions ? w i r e less communications ? serv er s, wo rk station s bene fits ? high effici en cy ? no heat si nk re qui red ? high er curren t capability at elevated tem peratu r e s than com petitors? 3 0 a qua rter-bri cks ? industry stan dard 1/8 th brick footprint: 0. 896? x 2.30? (2.06 in 2 ), 38% small e r than conve n tional quarte r-bri c ks features ? ro hs lead -free sol der a n d lead-sold er-e xempted prod uct s are available ? delivers up to 30 a ? industry - sta n dard q u a r ter-brick pin out ? outputs avail able: 3.3, 2.5, 1.8, 1.5, and 1.2 vdc ? on-b oa rd inp u t differential lc-filte r ? start-up into pre - bia s e d load ? no minim u m load re qui red ? weig ht: 0.72 oz [20.6 g] ? meets ba sic i n sul a tion re q u irem ents of en609 50 ? withsta n d s 1 00 v input tra n sie n t for 100 ms ? fixed-fre que ncy ope ration ? fully prote c te d ? remote output s e ns e ? positive or ne gative logic o n /off optio n ? latchi ng an d non-l a tchi ng prote c tion av ailable ? output voltag e trim rang e: +10%/ ? 20% with indu stry-stan dard trim e q u a tions (exce p t 1.2 vout) ? high reliabilit y: mtbf = 15.75 million hours, cal c ulate d pe r telcordi a t r -3 32, metho d i ca se 1 ? ul6 095 0 re cogni zed in us and can a d a and demko certified per iec/e n 60 950 ? de sign ed to meet cla ss b cond ucte d e m issi on s pe r fcc a nd en5502 2 wh en use d with external filter ? all materials meet ul94, v-0 flammabilit y rating des c ription the n e w hig h tempe r ature 30a sqe48 serie s of dc-dc converte rs p r ovide s a high effi cien cy singl e outp u t, in a 1/8 th brick p a ckag e that is only 62% the si ze of th e indu stry-standa rd qu art e r-bri ck. spe c ifically de sig ned fo r operation in system s that have lim ited airflow an d increa sed a m bi ent tempe r ature s , the sqe48t3 0 co nverters utilize the sa me pinout an d function ality of the industry-stand ard qu arter-b r icks. the 3 0 a sq e48 seri es converte rs pro v ide therm a l perfo rman ce in high te mpe r ature envi r o n ments that excee d s most compet itors' 3 0 a qu arter-b r icks. this pe rform ance is a c co mplish ed through the u s e of patente d /patent- pendi ng circuits, pa ckagi ng, and pro c e ssi ng te ch nique s to a c hieve ultra - high effici en cy, excelle nt thermal manag eme n t, and a low-bo dy profile. low-bo d y p r o f ile and the p r ecl u si on of h eat si nks min i mize i m pe da nce to syste m airflo w, thu s e nha nci ng cooli n g for both up stream an d d o w n s trea m de vices. t he u s e of 100% a u tomation fo r assem b ly, couple d with a d vanced electroni c ci rcuits and the r mal desi gn, result s in a produ ct with extremely hig h reliability. operating fro m a 36-75 v input, the sq e48t30 conv erters p r ovid e any stan da rd outp u t voltage from 3.3 v down to 1.2 v that can be trimm ed from ?20 % to +10% o f the nominal output volta ge ( 1 0 % for output volta ge 1.2 v), thus providing outstanding desig n flexibility. with sta nda rd pino ut and trim equ atio ns, the sqe 48 se ri es co nverters a r e perfe ct drop-i n repl aceme n ts fo r existing 3 0 a quarte r-bri c k desi g n s . inclu s ion of this co nver ter in a n e w d e si gn ca n re sult in si g n ificant b o a r d sp ace and cost savings. th e de signer can exp e ct relia bility improv em ent over othe r available conve r ters be cau s e of th e sqe48 serie s ? optimized therm a l efficie n cy. z d -019 61 rev 1.9 www. power-o ne.com page 1 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output electrical sp ecifica tions conditions: t a = 25 oc, airflow = 300 lf m (1.5 m / s), vin = 48 vdc , cin=33 f , unle ss otherwise specified. p a r a m e t e r n o t e s m i n t y p m a x units a b solut e maximum r a t i ngs input voltag e contin uo us 0 80 vdc operating am bie n t t e mperature -40 85 c storage t e mperature -55 125 c isolation ch arac teris t ics i/o isolation 225 0 vdc isolation c a p a c itance 200 pf isolation resistance 10 m ? featu r e ch a r acteristic s s w itch in g f r eque nc y 440 khz output voltag e t r im range 1 industr y - std. e quati ons (3.3 - 1.5 v) -20 + 10 % use trim equat ion o n pag e 6 (1.2 v) - 1 0 + 1 0 % remote sens e comp ensati o n 1 percent of v out ( nom ) + 1 0 % output overvoltage protecti o n latchin g or no n-latch i ng (3.3 - 1.8 v) 117 122 130 % latchin g or no n-latch i ng (1.5 - 1.2 v) 122 128 140 % overtemperat ure shutd o w n ( p cb) non-l a tchin g 125 c peak ampl itud e 1 adc peak back-dri v e output curr ent (sinkin g curre nt from extern al sourc e ) durin g startup into pre- bias ed output peak durati o n 50 s back-drive ou tput current (si n kin g curre nt from extern al source) converter off; exter nal vo ltag e 5 vdc 1 0 3 0 madc auto-restart perio d appli e s to all p r otection feat ur es 200 ms t u rn-on t i me see f i gs. e, f, and g 3 ms on/off control (positiv e lo gic) converter off (logic lo w ) -20 0.8 vdc converter on (logic hig h ) 2.4 20 vdc on/off control (ne gative l o g ic) converter off (logic high) 2.4 20 vdc converter on (logic l o w ) -20 0.8 vdc additional notes: 1 vout can be incr eased up to 10 % via the sens e leads or 10% via t he trim function. ho w e ver, th e tot a l output voltage trim from all sources should not excee d 10% of v out ( nom ), in or der to e n sure specified operat ion of overv o ltage protection circuitry . z d -019 61 rev 1.9 www. power-o ne.com page 2 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output electrical sp ecifica tions (continu e d) conditions: t a = 25 oc, airflow = 300 lf m (1.5 m / s), vin = 48 vdc , cin=33 f , unle ss otherwise specified. p a r a m e t e r n o t e s m i n t y p m a x units input char a c teris t ics operating in p u t voltage r a n ge 36 48 75 vdc input und e rvol tage lock out t u rn-on t h reshol d 3 3 3 4 3 5 v d c t u rn-off t h reshold 3 1 3 2 3 3 v d c input voltag e t r ansient 100 ms 100 vdc max i m u m input current 30 adc out @ 36 vdc in v out = 3.3 vd c 3.1 adc v out = 2.5 vd c 2.4 adc v out = 1.8 vd c 1.7 adc v out = 1.5 vd c 1.5 adc v out = 1.2 vd c 1.2 adc input stand-b y current vin = 48v, converter disa ble d 2 ma input no lo ad current (0 lo a d on the o u tput ) vin = 48v, converter ena bl ed v out = 3.3 vd c 42 ma v out = 2.5 vd c 34 ma v out = 1.8 vd c 30 ma v out = 1.5 vd c 28 ma v out = 1.2 vd c 27 ma input reflecte d-rip pl e curre nt, i s vin = 48v, 25 mhz ban d w i d th v out = 3.3 vd c 8 ma pk- pk v out = 2.5 vd c 6 ma pk- pk v out = 1.8 vd c 6 ma pk- pk v out = 1.5 vd c 6 ma pk- pk v out = 1.2 vd c 6 ma pk- pk input voltag e ripp l e r e jecti o n 120 hz v out = 3.3 vd c 91 db v out = 2.5 vd c 6 0 d b v out = 1.8 vd c 70 db v out = 1.5 vd c 65 db v out = 1.2 vd c 65 db z d -019 61 rev 1.9 www. power-o ne.com page 3 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output electrical sp ecifica tions (continu e d) conditions: t a = 25 oc, airflow = 300 lf m (1.5 m / s), vin = 48 vdc , cin=33 f , unle ss otherwise specified. p a r a m e t e r n o t e s m i n t y p m a x units output char acte r istics extern al lo ad cap a citanc e plus full lo ad ( r esistive) 30,00 0 f output curren t range 0 30 adc current lim i t incepti o n non-l a tchin g 31.5 36.5 42 adc peak short-ci rcuit curre nt non-l a tchin g , short = 10 m ? 46 a rms short-cir cuit curre nt non-l a tchin g 6 8 a r m s output voltag e set point (no load) 2 -1 +1 %vout output regu la tion over lin e over line 2 5 mv over load 2 5 m v output voltag e ran g e over line, loa d and temper atu r e 2 -1.5 +1 .5 %vout output rippl e and n o ise ? 25 mhz band w i dt h f u ll load + 10 f tantalum + 1 f ceramic v out = 3.3 vd c 4 0 7 5 mv pk- pk v out = 2.5 vd c 3 5 6 0 mv pk- pk v out = 1.8 vd c 3 0 5 0 mv pk- pk v out = 1.5 vd c 2 5 4 5 mv pk- pk v out = 1.2 vd c 2 0 4 0 mv pk- pk d y namic respons e load ch an ge 10a - 20a - 10a, di/dt = 0.1 a/ s co = 1 f ceramic (f ig. 3.3v .9) 30 3 mv di/dt = 5 a/ s co = 470 f pos + 1 f ceramic 150 mv settling t i me to 1% of vout 15 s efficiency 100 % lo ad v out = 3.3 vd c 90.5 % v out = 2.5 vd c 8 9 . 0 % v out = 1.8 vd c 8 6 . 5 % v out = 1.5 vd c 8 5 . 0 % v out = 1.2 vd c 8 3 . 0 % 50% lo ad v out = 3.3 vd c 92.0 % v out = 2.5 vd c 9 0 . 5 % v out = 1.8 vd c 8 8 . 5 % v out = 1.5 vd c 8 7 . 0 % v out = 1.2 vd c 8 5 . 0 % additional notes: 2 oper ating ambie n t temperat ure ra nge of -40 oc to 85 oc for convert e r. 3 see w a veforms f o r d y namic respo n se and settling time for different output voltages. z d -019 61 rev 1.9 www. power-o ne.com page 4 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output operations input and o u tpu t imped a nce these p o wer conve r ters h a ve bee n de sign ed to be stable with n o external ca pacito r s wh e n use d in lo w indu ctan ce in put and outp u t circuits. in many appli c ation s , the indu ctan ce a s so ciated with the distri butio n from the p o w er so urce to the input of the converter can affect the stability of the converter. the a ddition of a 33 f el ectrolytic cap a citor with an esr < 1 ? across the input helps to ensure stabilit y of the converter. in many appli c ation s , the use r ha s to use de co upling capa citance at the load. the power converter will exhi bi t stable operation with external lo a d ca pa citan c e up to 30 ,000 f o n 3.3 to 1.2 v outputs. additionally, see th e emc se ction of th is data sh eet for discu s sio n of other e x ternal co mp onent s whi c h may be req u ired for control of cond ucte d emission s. on/off (pin 2) the o n /off pin is u s ed t o turn the p o w er co nverte r on o r off re m o tely via a sy stem sign al. there a r e two remote co ntrol optio ns available, positive a n d negative lo gi c, with b o th referen c ed to vin(-). a typical co nne ction is sho w n in fig. a. rloa d vi n co ntro l in p u t vi n ( + ) vi n ( - ) on/ off vout ( + ) vout (- ) tri m sen se (+ ) sen s e ( - ) (t op vi ew ) sqe4 8 con ver t e r fig. a : circ uit c onfi gura t io n for on/ o f f f unc tio n . the po sitive l ogic ve rsi on t u rn s on wh en the on/o ff pin is at a lo gic high and turn s off wh en at a logi c low. t he co n v erter i s on when th e on/ o ff pin i s l e ft open. se e the ele c trical specifi c atio ns fo r logi c high/lo w defin itions. the neg ative logic version turns on wh en the pin is at a logic lo w and turn s off when the pi n is at a logic high. the o n /off pin can be ha rd wired directly to vin(-) to ena ble automati c powe r up of the conve r ter without the n eed of an external cont rol sign al. the o n /of f pin i s int e rnally pulle d up to 5 v throug h a re sisto r . a prop e r ly de-bou n c ed mech ani cal s w it ch, o pen -c ollect o r t r a n si st or, o r fe t can be u s ed to d r ive the input of the on/o ff pin . the devi c e m u st be cap abl e of sin k ing u p to 0.2 ma at a low level voltage of 0.8 v. an external voltag e source (20 v maximum) may be connected directly to the on/off input, in whic h c a s e it mus t be cap able of so urci ng o r sin k ing up to 1 m a depen ding on the si gnal polarity. see the startu p informatio n se ction for sy stem timing waveforms a s soci ated with use of the o n /off pin. remote sen se (pins 5 an d 7) the rem o te se nse fe ature of th e conve r ter comp en sate s for voltag e drop s occu rri ng b e twe e n the outp u t pi ns of the co nverter an d the loa d . th e sense(-) (pi n 5) and se nse(+) (pin 7) pi ns sh oul d be con n e c te d at th e lo a d o r at the point where regul ation is required (se e fig. b). 100 10 rw rw rlo a d vin vi n (+ ) vi n ( - ) on / o ff vo ut ( + ) vo ut ( - ) tr i m se n s e ( + ) se n s e ( - ) (t op v i ew ) s q e48 con verter fig. b : re mo te sense circ uit c o nfig urati on. ca utio n if rem o te se nsi ng is n o t utiliz ed, the se nse(-) pin m u st be conn ecte d t o t h e vou t ( -) pi n ( p in 4), an d t h e sense(+) pin mus t be c o n n e c ted to the v o ut(+ ) pi n (pin 8 ) to ens u re t h e con v er ter w ill r e gula t e at the s p ecifie d ou tp ut v o lta g e. if the se conn ecti ons ar e no t m a de, t h e co n v ert e r w i ll deli v e r a n out pu t v o l t ag e that is sli g h t l y high er t h an the speci fied dat a sheet v a lue. be c a us e the s e ns e le ads c a r r y min i ma l c u r r e n t, large tra c e s on the e nd-u s er b oard a r e not req u ired. ho wever, se nse traces s hould b e ru n side by side and l o cated clo s e to a g r oun d pl ane to minimi ze system n o ise and en su re o p timum perfo rman ce. the co nverte r?s outp u t overvoltage p r o t ection (ovp ) sen s e s th e v o ltage acro ss vout(+) an d vout(-), and not across th e sen s e line s , so the re sistan ce (a nd resulting voltage drop) b e t ween the o u tput pins of the co nverte r and the loa d sh ould be minimized to prevent un wa nted trigge rin g of the ovp. whe n utili zin g the rem o te se nse featu r e, ca re mu st be ta ken no t to exceed the m a ximum allo wa bl e output power capability of the convert e r, whi c h i s equal to the prod uct of the nominal o u t put voltage and the all o wa ble outp u t current for the give n conditions. whe n u s in g remote sen s e, the o u tput v o ltage at the conve r ter ca n be in crea sed by a s m u ch as 10% above the n o minal rating in o r de r to maintain th e requi re d voltage a c ross the load. th erefo r e, the desi gne r mu st, if necessa ry, decre ase the maximum z d -019 61 rev 1.9 www. power-o ne.com page 5 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output curre n t (origi nally obtai ne d from the de rating curve s ) by the same perce ntage to en sure th e converte r?s actual outpu t powe r re mains at or belo w the maximum all o wa ble outp u t power. output voltage adjust /trim (pin 6) the outp u t voltage can b e adju s ted up 10% or d o wn 20% for vout 1.5 v, a n d 10% for vout = 1.2 v relative to the rated o u tput voltage by the addition of an externally con n e c ted resi stor. f o r o u tput voltage 3.3 v, trim up to 10% is guarantee d o n ly at vin 40 v, and it is margin al (8 % to 10%) at vin = 36 v. the trim pi n sho u ld be l e ft open if trimming is n o t being used. to minimi ze noise pi cku p , a 0.1 f cap a cito r is conne cted int e rnally bet we en the trim and sense(-) pins. to in crea se t he o u tput volt age, refer to fig. c. a trim resi st o r , r t- i n c r , should b e conn ecte d between th e trim (pin 6 ) and sense(+) (pin 7), wit h a value of: 10.22 1.225 ? 626 ? )v 5.11(100 r nom o incr t [k ? ], for 3.3 ? 1.5 v. 7.2 ? 84.6 r incr t [k ? ] (1.2 v) whe r e, incr t r req u ire d value of trim-up resi sto r k ? ] nom o v nomin a l valu e of output voltage [v] 100 x v ) v (v ? nom - o nom - o req - o [%] req o v de sire d (trim m ed) o u tput voltage [v]. whe n trimmi ng up, ca re must b e take n not to exce ed the conve r te r?s maximu m allowa ble o u tput power. see the p r ev ious se ction f o r a com p let e discu s sion of this requi re ment. rloa d vin vin (+ ) vin (- ) on /o ff vout (+ ) vo ut (- ) tri m se n s e ( + ) s e n s e ( - ) r t- i n c r (t o p v i e w ) sq e 4 8 co nv ert e r fig. c : co nfi gur ation for i n crea sing out pu t v o l t age. to decre ase the output voltage (fi g . d), a trim resi st o r , r t - decr , should be con n e c ted be tween the trim (pin 6 ) and sense(-) (pin 5), with a value of: 10.22 | ? | 511 r decr t [k ? ] (3.3 ? 1.5 v) 15 | ? | 700 r decr t [k ? ] (1.2 v) whe r e, decr t r req u ire d val ue of t r im-do w n re sist or [ k ? ] and ? is define d above. not e : the above equa tions for calculation of trim resistor values match those t y pically used in convent ional industry-st andard qua rter - br icks ( e x c ept for 1.2 v output). converters w i th output voltages 1.2 v is available w i th alte rnative tr im featur e to provide the customer s w i th the flex ibility of second sourcing has a character ?t? in the part number. the trim equations of ?t? version of conv erters and more information can be found in application note fo r output voltag e trim function oper ation. rl o a d vin vi n ( + ) vi n ( - ) on/ o ff vout ( + ) vout (-) tr im se n se ( + ) sense (- ) r t- de c r ( t op v i ew ) s q e4 8 co nv er ter fig. d : co nfi gur ation for decrea sing out pu t v o l t age. trimmin g /se n s ing beyon d 110% of th e rated outp u t voltage is no t an accepta b le de sign p r actice, as thi s con d ition co uld cau s e u n wa nted trig gerin g of th e output overv o ltage p r ote c tion (ovp) circuit. th e desi gne r sh o u ld ensure that the difference betwe e n the voltage s across the co nverter? s outp u t pin s and its sen s e pi ns d oes n o t exce ed 10% of v out ( nom ), or: x nom - o sense sense out out 10% v )] ( v ) ( [v )] ( v ) ( [v d [v] this e quation is appli c abl e for any con d i tion of outpu t sen s in g and/ or output trim . z d -019 61 rev 1.9 www. power-o ne.com page 6 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output protection features input un der v o l tage lock out input und erv o ltage lo cko u t is stand a r d with this converter. t he converter will shut down when the input voltage drop s bel ow a pre - dete r mi ned voltage. the input vo ltage must b e typically 34 v for the c onverter to turn on. on ce the conve r ter h a s bee n turned o n , it will shut of f when the i nput voltage drop s typi call y below 32 v. this fe ature is b enefi c ial in preventing deep di scha rging of batt e rie s u s e d in telecom a ppli c ation s . outpu t ov ercurren t protection (ocp ) the conve r t e r i s p r ote c ted a gain s t o v ercu rrent o r sho r t circuit condition s. up on se nsin g a n overcurrent condition, the converter will swit ch to constant curre n t ope ra tion and th ereby begi n to redu ce outpu t voltage. whe n the outp u t voltage d r o p s b e lo w 60% of the nomin al value of output voltage, the converte r will shut down (fig x.15). once the converter has shut down, it will attempt to r e s t ar t no mina lly e v e r y 200 ms w i th a typ i c a l 3- 5 % duty cycl e (fig. x.16). t he attempte d re sta r t will contin ue in de finitely until the ove r loa d or sho r t circui t con d ition s a r e rem o ved o r the o u tput voltage ri se s above 40 -50 % of its nominal value. once the o u tput cu rrent is b r ou ght back into its spe c ified ran ge, the conve r ter autom atically exits the hiccup mo de and continu e s normal op eration. for i m plem e n tations whe r e l a tchi ng i s req u ire d , a ? l a t ch in g? o p tio n (l ) is a v a ila b l e fo r s h o r t c i rc u i t and ovp protect i ons. co nve r ters with t he lat c hin g feature will l a tch off if either event occurs. the conve r ter will attempt to restart after ei ther the i nput voltage i s re moved and reappli ed or the on/of f pin is cy cled outpu t ov erv o ltage protection (ovp) the converter will shut down if the output voltage across vo ut(+) (pin 8) an d vout(-) (pi n 4) ex cee d s the threshold of the ovp circuitry. the ovp circuitry contai ns it s o w n referen c e, indep ende nt of the output voltage re gul ation loo p . o n ce th e conv erter ha s shu t down, it will attempt to re st art every 200 ms until the ovp conditio n is rem o ved. for i m plem e n tations whe r e l a tchi ng i s req u ire d , a ? l a t ch in g? o p tio n (l ) is a v a ila b l e fo r s h o r t c i rc u i t and ovp protect i ons. co nve r ters with t he lat c hin g feature will latch off if ei ther event occurs. the conve r ter will attempt to restart after ei ther the i nput voltage i s re moved and reappli ed or the on/of f pin is cy cled. ov ertemperature pro t ec tion (otp ) the conve r ter will shut do wn unde r a n overtemp erat ure con d itio n to protect itself from overhe ating caused by ope ra tion out side the therma l deratin g curv es, or ope rati on in ab no rm al co ndition s su ch a s syst em fan failure. the co nverter with the non-l a tchi ng option will a u tomatically restart afte r it has cool ed to a safe ope rat i ng tempe r atu r e. safety requi rements the conve r ters meet no rth a m eri c an an d internation a l safety re g u latory requi reme nts p e r ul6 095 0 an d en609 50. b a si c insulatio n is p r ovide d betwe en inp u t and output. to co mply with safety agen cie s ? re q u irem ents, a n input lin e f u se mu st b e u s ed external to th e conve r ter. the tabl e below p r ovide s the recommended fuse rating for us e with this family of prod uct s . ou tpu t voltage f u se ratin g 3.3 v 5 a 2.5 v 4 a 1.8 v, 1.5 v 3 a 1.2 v 2.5 a all sq e co nve r te rs ar e u l a p p r o ve d fo r ma ximum fuse ratin g of 15a. to protect a gro up of converte rs with a singl e fuse, the rati ng ca n be in cre a sed from the recomme nded valu e a bove. electromag n e tic comp ati b ilit y (emc) emc requi re ments m u st be met at th e end -p rod u ct system l e vel, as n o spe c if ic sta nda rd s dedi cated to emc charact e risti cs of bo ard m ounte d comp one nt dc-dc conve r t e rs exi s t. ho wever, po wer-one te sts its conve r ters to seve ral system leve l standa rd s, prima r y of which is th e more stri nge nt en55 022, inform ation tech nolog y e quipm e n t - rad i o disturban ce cha r a c teri stic s-lim i ts and m e thods of m easurem ent. an effective i n ternal l c di fferential filter sig n ificantly redu ce s inp u t reflected rip p le cu rrent, and improve s emc. with the addition of a simple exte rnal filter, all versio ns of th e sqe48-se ries of conve r t e rs p a ss the requi rem ents of cla ss b con d u c ted e m issi on s pe r en550 22 an d fcc requi reme nts. co ntact powe r- one appli c a t ions engin e e ring fo r de tails of this testing. z d -019 61 rev 1.9 www. power-o ne.com page 7 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output startu p infor m ation (usin g negativ e on/off ) scenario #1: initial startup from bulk su pply on/of f function en ab led, co nver ter started via ap plic atio n of v in . see f i gure e. t i m e c o m m e n t s t 0 on/of f pin is on; sy stem fro n t-end p o w e r is toggl ed o n , v in to converter begins to rise. t 1 v in crosses un dervo ltage loc kout protectio n circuit thresh ol d; converter e n abl ed. t 2 conv erter beg i n s to respon d to turn-on command (converter turn-on delay ). t 3 conv erter v out reaches 1 0 0 % of nomina l val ue. f o r this examp l e, the total con v erter startup time (t 3 - t 1 ) is t y pic a ll y 3 ms. scenario #2: initial startup using on/o f f pin with v in previo usl y po w e re d, converter start ed via on/of f pin. see f i gur e f . t i m e c o m m e n t s t 0 v input at nomin al val ue. t 1 arbitrary time w hen on/of f pin is e n a b le d (converter e n a b le d). t 2 end of conv erter turn-on d e l a y. t 3 conv erter v out reaches 1 0 0 % of nomina l val ue. f o r this examp l e, the total con v erter startup time (t 3 - t 1 ) is t y pic a ll y 3 ms. scen ario #3: t u r n - o f f an d rest art usin g on/of f pin with v in previo usl y po w e re d, converter is d i s abl ed a nd then en ab led vi a on/of f pin. see f i gur e g. t i m e c o m m e n t s t 0 v in and v out are at nomin al va lues; on/of f pin on. t 1 on/of f pin arbitraril y d i sa ble d ; converter output falls to zero; turn -on i n h i bit de la y p e rio d (200 ms t y pica l ) is initiate d, an d on/of f pin action is i n tern all y in hi bited. t 2 on/of f pin is ext e rna l l y re-e nab led. if (t 2 - t 1 ) 200 ms , ex ternal action of on/of f pin is locke d out b y s t artup inh i bit timer. if (t 2 - t 1 ) > 200 ms , on/off pin action is intern all y e n a b l ed. t 3 t u rn-on inhi bit del a y peri od e nds. if on/of f pin is on, converter begins turn-on; if off, converter a w aits on/of f pin on signa l; see f i gure f . t 4 end of conv erter turn-on d e l a y. t 5 conv erter v out reaches 1 0 0 % of nomina l val ue. f o r the conditi on, (t 2 - t 1 ) 200 ms , the total converter startup time (t 5 - t 2 ) is typica ll y 203 ms. f o r (t 2 - t 1 ) > 200 ms , startup w i l l be typ i cal l y 3 ms a fter release of on/of f pin. v in on / o f f st a t e v ou t t t 0 t 1 t 2 t 3 on of f fig. e: s t art up s cenario # 1 . on/of f sta t e v ou t t 0 t 1 t 2 t 3 on of f v in t fig. f : star tu p s cenario # 2 . fig. g: st artu p scenario #3. on/off state off on v out t 0 t 2 t 1 t 5 v in t t 4 t 3 200 ms z d -019 61 rev 1.9 www. power-o ne.com page 8 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output char acteriza t ion gener a l info rmation the conve r t e r h a s be en ch ara c te rized for ma ny operational asp e ct s, to inclu de the r mal de rating (maximum l o ad current a s a fun c tion of ambient temperature and ai rflow) for vertical a nd ho rizo ntal mounting, efficien cy, startup a n d shutdo wn para m eters, output rip p le and no ise, tran sien t respon se to load ste p -ch ange, ove r lo ad, and sho r t c i rc uit. test conditi ons all data pre s ente d we re taken with the conve r te r sold ere d to a test bo ard, spe c ifically a 0.060 ? thi c k printed wi rin g boa rd (p wb) with fou r la y e rs. t he to p and b o ttom la yers we re not metalized. t he two inn e r layers, comp rised of two - o unce cop p e r , were used to provide trace s for conne ct i v ity to the converter. the l a ck of metalizatio n on the o u ter layers a s wel l as the limited thermal co n nectio n en su red that he at trans fer from the c onv erter to the pwb was minimized. this provide s a worst-ca se but con s i s ten t scena rio for t herm a l derating purpo se s. all measu r e m ents requi ri ng airflo w we re made in th e vertical and h o rizontal win d tunnel usi ng infrare d (i r) thermo gra p h y and thermo cou p le s for thermom e try. ensu ring co mpone nts o n the conv erter d o no t excee d their rating s is imp o rtant to mai n taining hig h reliability. if one antici pat es ope ratin g the conve r ter at or clo s e t o the maxim u m load s sp ecified i n the deratin g cu rves, it is prud ent to che c k actu al operating t e mpe r atures in the appli c atio n. therm o g r ap h i c imagi ng is p r eferable; if this cap ability is not available, then thermo cou p le s may be use d . the use of awg #40 gau ge th ermo co uple s is re comm en ded to en su re me asure m ent a c curacy. careful routing of the ther mocouple l e ads will further minimize me asu r em ent e r ror. refe r to fig. h fo r the optimum mea s uri ng the r mo cou p le lo catio n s. thermal der a ting load cu rre nt vs. ambient temperature and ai rflo w rates a r e giv en in fig. x.1 and fig. x.2 for vertical and ho rizo ntal conve r ter mountin g. ambient temperature wa s varie d b e twee n 25 c an d 85 c, with ai rflow rates f r om 30 to 50 0 l f m (0.1 5 to 2.5 m/s). f o r e a c h se t o f c o nd itio n s , the ma ximu m load curre n t wa s d e fined a s the lowe st of: (i) the o u tp ut current at which any fet junction temperature doe s not ex ceed a maxi mum spe c ifie d temperature of 120 c a s indi cated by th e thermo gra phi c image, o r (ii) the t e m peratu r e of the tra n sfo r mer doe s n o t excee d 120 c , or (iii) the nominal rating of the converter (30 a on 3.3 to 1.2 v). duri ng no rmal o peration, de rating cu rve s wi th maximum fe t temperature less o r eq ual to 12 0 c sho u ld n o t be excee ded. tem p e r ature at b o th thermo co uple location s sh own in fi g. h sh ould not excee d 12 0 c in ord e r t o operate in sid e the d e ratin g curv e s . fig. h : location s of the thermoc ouple for the r mal testing. efficiency fig. x.3 shows the effici e n cy vs. load curre n t plot for ambient temp eratu r e of 25 oc, airflo w rat e of 300 lfm (1.5 m/s) with vertical mo unting a nd in put voltage s of 36 v, 48 v, a nd 72 v. also , a plot of efficien cy vs. loa d curre n t, as a function of ambient te mperature wi th vin = 4 8 v, airflow rate of 200 l f m (1 m/ s) with vertical mo un ting is sh own in fig. x.4. po w e r dis s ipation fig. x.5 shows the power dissipatio n vs. load current plot for ta = 25 oc, airflo w rate of 300 lfm (1.5 m/s) with vertical mounting an d input voltages of 3 6 v, 48 v, and 72 v. also, a plot o f powe r di ssi pation vs. lo a d curre n t, as a function of ambient te mperature wi th vin = 4 8 v, airflow rate of 200 l f m (1 m/ s) with vertical mo un ting is sh own in fig. x.6. st art u p output voltage wavefo rms, du rin g the turn-on transi ent u s i ng the o n / o ff pin fo r full rated lo ad curre n ts (re si stive load ) a r e sh own wit hout an d wit h external loa d cap a cita nce in figs. x.7-8, respe c tively. ripple and noise fig. x.11 show the outp u t voltage ripple wavefo rm, measured at full rated l oad curre n t with a 1 0 f tantalum an d 1 f ce ramic cap a cit o r a c ro ss th e output. note that all o u tput voltage waveforms a r e measured a c ross a 1 f ce rami c ca pa citor. the i nput reflected -ri ppl e current waveform s a r e obtaine d usi n g the test set up sh own in fig x.12. the corre s p ondin g waveforms are sho w n in figs. x.13-1 4 . z d -019 61 rev 1.9 www. power-o ne.com page 9 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output sqe48t30 03 3 char acteri z atio n curv es a m bi e n t te mp er a t ur e [ c ] 20 30 40 5 0 6 0 7 0 80 90 l o ad c u r r e n t [a dc] 0 5 10 15 20 25 30 35 500 lfm (2. 5 m/ s) 400 lfm (2. 0 m/ s) 300 lfm (1. 5 m/ s) 200 lfm (1. 0 m/ s) 100 lfm (0. 5 m/ s) n c - 30 lf m (0. 15 m/ s ) a m bi e n t te mp er a t ur e [ c ] 20 30 40 5 0 6 0 7 0 80 90 l o ad c u r r e n t [a dc] 0 5 10 15 20 25 30 35 500 lfm (2. 5 m/ s) 400 lfm (2. 0 m/ s) 300 lfm (1. 5 m/ s) 200 lfm (1. 0 m/ s) 100 lfm (0. 5 m/ s) n c - 30 lf m (0. 15 m/ s ) fig. 3.3v. 2 : av ailable load current vs. ambient air temperat ur e and airflo w ra tes for s q e4 8t30033 converter m ounted horizontally w i t h air flow ing f r o m pin 3 to pin 1, mos f et temperatu r e 12 0 c, vin = 48 v. fig. 3.3v.1 : available load current vs. ambient air temperatu r e and airflow rat e s for sqe48t300 33 converter mounted verticall y w i th air flo w ing f r om pin 3 to pin 1, mosfe t temperatu r e 120 c, vin = 48 v. note : nc ? natu ral convection load cu r r e nt [a dc] 0 5 10 15 20 25 30 35 e f f i ci en cy 0. 7 0 0. 7 5 0. 8 0 0. 8 5 0. 9 0 0. 9 5 70 c 55 c 40 c load cu r r e nt [a dc] 0 5 10 15 20 25 30 35 e f f i ci en cy 0. 7 0 0. 7 5 0. 8 0 0. 8 5 0. 9 0 0. 9 5 72 v 48 v 36 v fig. 3.3v. 4 : effi ciency vs. load c u rrent and ambi ent temper ature for sqe 48t30 03 3 converter m o u n ted vertically w i th vin = 48 v and air flo w ing fr om pin 3 to pin 1 at a rate of 200 l f m (1.0 m/s ) . fig. 3. 3v.3: ef ficiency vs. load current and in put voltage fo r sqe48t3 0033 converter mounte d vert ically w i th air flow ing fro m pin 3 to pin 1 at a rate of 30 0 lfm (1.5 m/s) and ta = 25 c. z d -019 61 rev 1.9 www. power-o ne.com page 10 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output load c u rrent [a dc] 0 5 10 15 20 25 30 35 p ow er di ss i pa ti on [w] 0.00 3.00 6.00 9.00 12.00 15.00 72 v 48 v 36 v fig. 3.3v.5: po wer dissipation vs. load cur r ent and input voltage for sqe48 t 3003 3 converter mou n ted vertically w i th air flow ing from pin 3 to pin 1 at a rate of 3 00 lfm (1.5 m/s) and ta = 25 c. fig. 3. 3v.7: turn -on t r ansient at full rated load curren t (resistive) w i th n o output capacitor at vin = 48 v , triggered via on/ o f f pin. to p trace: on/ o ff signal (5 v/div.). bottom trace: output voltage (1 v/div.). time scale: 1 ms/div. load c u rrent [a dc] 0 5 10 15 20 25 30 35 p ow er di ss i pa ti on [w] 0.00 3.00 6.00 9.00 12.00 15.00 70 c 55 c 40 c fig. 3.3v.6 : po w e r dissipation vs. load current and ambient temperatu r e for sqe48t3 0033 converter mou n ted verticall y w i th vin = 48 v and air flow ing fr om pin 3 to pin 1 at a rate of 200 lfm (1.0 m/ s). fig. 3.3v.8 : t u rn-on t r ansient at full rated load current (resistive) plus 10,000 f at vin = 48 v, trigger e d via on/off pin. top t r ace: on/ o f f signal ( 5 v/div.). bottom trace: outpu t voltage (1 v/div.). time scale: 1 ms/div. fig. 3.3v.9 : ou tput voltage response to load current step- change (10 a ? 20 a ? 10 a) at vin = 48 v. top trace: output voltage (100 mv/div.). bottom trace: load curren t (10 a/div.). curr ent slew rate: 0. 1 a/s. co = 1 f ceramic. time scale: 0.2 ms/div. fig. 3. 3v.10: ou tput voltage resp onse to load cur r ent step-cha n ge (10 a ? 20 a ? 10 a) at vin = 48 v. top trace: output voltage (1 00 mv/div.). bottom trace: load curr e n t (10 a/div.). c u rrent sle w rate: 5 a/s. co = 470 f pos + 1 f ce ramic. time scale: 0.2 ms/div. z d -019 61 rev 1.9 www. power-o ne.com page 11 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output fig. 3.3v.11 : output voltage ripple (20 mv/div.) at full rated load current into a resistive load w i th co = 1 0 f tantalum + 1 f ceramic and vin = 48 v. time scale: 1 s/div.. vo u t v so u r ce i s i c 1 f ce r a m i c capacitor 10 h sour ce ind u c t ance dc- dc co nv e r te r 33 f es r < 1 electr o l ytic c a paci t or ? sq e48 fig. 3.3v.1 2: te st setup for me asuring input ref l ected ripple cur r ents, i c and i s . fig. 3.3v.13 : input reflected-ri pple current, i c (50 ma/div.), measured at input terminals at full rated load current and vin = 48 v. refer t o fi g. 3.3v.12 for test setup. time scale: 1 s/div. 10 20 30 4 0 4.0 io u t [a d c ] v out [ v d c ] 0 0 3.0 2.0 1.0 fig. 3.3v.15 : output voltage vs. load current sh ow ing cur r ent limit point and converter shutd o wn point. inp u t voltage has almost no effect on current limit characteristic. fig. 3.3v.14 : input reflected-ri pple current, i s (10 ma/div.), measured t h roug h 10 h at the s ource at full rate d load cur r en t and vin = 48 v. refer t o fig. 3.3 v .12 for test setu p. time scale: 1 s/div. fig. 3.3v.16 : load curre nt (top trace , 20 a/div., 50 ms/div.) into a 10 m ? s hort circuit duri ng restart, at vin = 48 v. bott om trace (20 a/ d i v., 1 ms/div.) is an expansion of the on-time p o r tion of the top t r ace. z d -019 61 rev 1.9 www. power-o ne.com page 12 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output sqe48t30 02 5 char acteri z atio n curv es a m bi ent t e mpe r at ure [ c] 20 30 40 50 60 70 8 0 90 load c u rrent [ a dc] 0 5 10 15 20 25 30 35 500 lfm (2. 5 m/ s ) 400 lfm (2. 0 m/ s ) 300 lfm (1. 5 m/ s ) 200 lfm (1. 0 m/ s ) 100 lfm (0. 5 m/ s ) nc - 30 lfm (0. 15 m/ s ) fig. 2.5v.1 : available load current vs. ambient air temperatu r e and airflow rat e s for sqe48t300 25 converter mounted verticall y w i th air flo w ing f r om pin 3 to pin 1, mosfe t temperatu r e 120 c, vin = 48 v. note : nc ? natu ral convection load c u rrent [a dc] 0 5 10 15 20 25 30 35 effic i en cy 0.70 0.75 0.80 0.85 0.90 0.95 72 v 48 v 36 v fig. 2. 5v.3: ef ficiency vs. load current and in put voltage fo r sqe48t3 0025 converter mounte d vert ically w i th air flow ing fro m pin 3 to pin 1 at a rate of 30 0 lfm (1.5 m/s) and ta = 25 c. a m bi ent t e mpe r at ure [ c] 20 30 40 50 60 70 8 0 90 load c u rrent [ a dc] 0 5 10 15 20 25 30 35 500 lfm (2. 5 m/ s ) 400 lfm (2. 0 m/ s ) 300 lfm (1. 5 m/ s ) 200 lfm (1. 0 m/ s ) 100 lfm (0. 5 m/ s ) nc - 30 lfm (0. 15 m/ s ) fig. 2.5v. 2 : av ailable load current vs. ambient air temperat ur e and airflo w ra tes for s q e4 8t30025 converter m ounted horizontally w i t h air flow ing f r o m pin 3 to pin 1, mos f et temperatu r e 12 0 c, vin = 48 v. load c u rrent [a dc] 0 5 10 15 20 25 30 35 effic i en cy 0.70 0.75 0.80 0.85 0.90 0.95 70 c 55 c 40 c fig. 2.5v. 4 : effi ciency vs. load c u rrent and ambi ent temper ature for sqe 48t30 02 5 converter m o u n ted vertically w i th vin = 48 v and air flo w ing fr om pin 3 to pin 1 at a rate of 200 l f m (1.0 m/s ) . z d -019 61 rev 1.9 www. power-o ne.com page 13 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output load c u rrent [a dc] 0 5 10 15 20 25 30 35 p ow er di ss i pa ti on [w] 0.00 2.00 4.00 6.00 8.00 10.00 12.00 72 v 48 v 36 v fig. 2.5v.5: po wer dissipation vs. load cur r ent and input voltage for sqe48 t 3002 5 converter mou n ted vertically w i th air flow ing from pin 3 to pin 1 at a rate of 3 00 lfm (1.5 m/s) and ta = 25 c. fig. 2. 5v.7: turn -on t r ansient at full rated load curren t (resistive) w i th n o output capacitor at vin = 48 v , triggered via on/ o f f pin. to p trace: on/ o ff signal (5 v/div.). bottom trace: output voltage (1 v/div.). time scale: 2 ms/div. load c u rrent [a dc] 0 5 10 15 20 25 30 35 p ow er di ss i pa ti on [w] 0.00 2.00 4.00 6.00 8.00 10.00 12.00 70 c 55 c 40 c fig. 2.5v.6 : po w e r dissipation vs. load current and ambient temperatu r e for sqe48t3 0025 converter mou n ted verticall y w i th vin = 48 v and air flow ing fr om pin 3 to pin 1 at a rate of 200 lfm (1.0 m/ s). fig. 2.5v.8 : t u rn-on t r ansient at full rated load current (resistive) plus 10,000 f at vin = 48 v, trigger e d via on/off pin. top t r ace: on/ o f f signal ( 5 v/div.). bottom trace: outpu t voltage (1 v/div.). time scale: 2 ms/div. z d -019 61 rev 1.9 www. power-o ne.com page 14 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output fig. 2.5v.9 : ou tput voltage response to load current step- change (10 a ? 20 a ? 10 a) at vin = 48 v. top trace: output voltage (100 mv/div.). bottom trace: load curren t (10 a/div.). curr ent slew rate: 0. 1 a/s. co = 1 f ceramic. time scale: 0.2 ms/div. fig. 2.5v.11 : output voltage ripple (20 mv/div.) at full rated load current into a resistive load w i th co = 1 0 f tantalum + 1 f ceramic and vin = 48 v. time scale: 1 s/div. fig. 2.5v.10 : output voltage response to load current step- change (1 0 a ? 20 a ? 10 a) at vin = 48 v. to p trace: output voltage (100 m v /div.). bottom t r ace: load cur r e n t (10 a/div.). curre nt slew rat e : 5a/s.co = 4 70 f pos + 1 f ceramic. time scale: 0.2 ms/div. vo u t v so u r ce i s i c 1 f ce r a m i c capacitor 10 h sour ce ind u c t ance dc- dc co nv e r te r 33 f es r < 1 electr o l ytic c a paci t or ? sq e48 fig. 2.5v.12 : t e st setup for m easuring input reflected ripple cur r ents, i c and i s . z d -019 61 rev 1.9 www. power-o ne.com page 15 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output fig. 2.5v. 13: in put reflected- ripple current, i c ( 100 ma/div.) , measured at input terminals at full rated load current and vin = 48 v. refer t o fi g. 2.5v.12 for test setup. time scale: 1 s/div. 10 20 30 4 0 4.0 io u t [a d c ] v out [ v d c ] 0 0 3.0 2.0 1.0 fig. 2.5v.15 : output voltage vs. load current sh ow ing cur r ent limit point and converter shutd o wn point. inp u t voltage has almost no effect on current limit characteristic. fig. 2.5v.14 : input reflected-ri pple current, i s (10 ma/div.), measured t h roug h 10 h at the s ource at full rate d load cur r en t and vin = 48 v. refer t o fig. 2.5 v .12 for test setu p. time scale: 1 s/div. fig. 2.5v.16 : load curre nt (top trace , 20 a/div., 50 ms/div.) into a 10 m ? s hort circuit duri ng restart, at vin = 48 v. bott om trace (20 a/ d i v., 2 ms/div.) is an expansion of the on-time p o r tion of the top t r ace. z d -019 61 rev 1.9 www. power-o ne.com page 16 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output sqe48t30 01 8 char acteri z atio n curv es a m bi ent t e mpe r at ure [ c] 20 30 40 50 60 70 8 0 90 load c u rrent [ a dc] 0 5 10 15 20 25 30 35 500 lfm (2. 5 m/ s ) 400 lfm (2. 0 m/ s ) 300 lfm (1. 5 m/ s ) 200 lfm (1. 0 m/ s ) 100 lfm (0. 5 m/ s ) nc - 30 lfm (0. 15 m/ s ) fig. 1.8v.1 : available load current vs. ambient air temperatu r e and airflow rat e s for sqe48t300 18 converter mounted verticall y w i th air flo w ing f r om pin 3 to pin 1, mosfe t temperatu r e 120 c, vin = 48 v. note : nc ? natu ral convection load c u rrent [a dc] 0 5 10 15 20 25 30 35 effic i en cy 0.65 0.70 0.75 0.80 0.85 0.90 0.95 72 v 48 v 36 v fig. 1. 8v.3: ef ficiency vs. load current and in put voltage fo r sqe48t3 0018 converter mounte d vert ically w i th air flow ing fro m pin 3 to pin 1 at a rate of 30 0 lfm (1.5 m/s) and ta = 25 c. a m bi ent t e mpe r at ure [ c] 20 30 40 50 60 70 8 0 90 load c u rrent [ a dc] 0 5 10 15 20 25 30 35 500 lfm (2. 5 m/ s ) 400 lfm (2. 0 m/ s ) 300 lfm (1. 5 m/ s ) 200 lfm (1. 0 m/ s ) 100 lfm (0. 5 m/ s ) nc - 30 lfm (0. 15 m/ s ) fig. 1.8v. 2 : av ailable load current vs. ambient air temperat ur e and airflo w ra tes for s q e4 8t30018 converter m ounted horizontally w i t h air flow ing f r o m pin 3 to pin 1, mos f et temperatu r e 12 0 c, vin = 48 v. load c u rrent [a dc] 0 5 10 15 20 25 30 35 effici enc y 0.65 0.70 0.75 0.80 0.85 0.90 0.95 70 c 55 c 40 c fig. 1.8v. 4 : effi ciency vs. load c u rrent and ambi ent temper ature for sqe 48t30 01 8 converter m o u n ted vertically w i th vin = 48 v and air flo w ing fr om pin 3 to pin 1 at a rate of 200 l f m (1.0 m/s ) . z d -019 61 rev 1.9 www. power-o ne.com page 17 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output load c u rrent [a dc] 0 5 10 15 20 25 30 35 p ow er di ss i pa ti on [w] 0.00 2.00 4.00 6.00 8.00 10.00 12.00 72 v 48 v 36 v fig. 1.8v.5: po w e r dissipation vs. load current and input voltage for sqe48 t 300 18 converter mo unted vertically w i th air flo w in g from pin 3 to pin 1 at a rate of 300 lfm (1.5 m/s) a nd ta = 25 c. fig. 1. 8v.7: turn -on t r ansient at full rated load curren t (resistive) w i th n o output capacitor at vin = 48 v , triggered via on/ o f f pin. to p trace: on/ o ff signal (5 v/div.). bottom trace: output voltage (1 v/div.). time scale: 2 ms/div. load c u rrent [a dc] 0 5 10 15 20 25 30 35 p ow er di ss i pa ti on [w] 0.00 2.00 4.00 6.00 8.00 10.00 12.00 70 c 55 c 40 c fig. 1 . 8v.6: po w e r dissipation vs. load current and am bient temperatu r e fo r sqe48t3 0018 c onverter mo unte d vertically w i th vin = 48 v and a i r flo w ing from pi n 3 to pin 1 at a r a te of 2 00 l f m (1.0 m/s). fig. 1.8v.8 : t u rn-on t r ansient at full rated load current (resistive) plus 10,000 f at vin = 48 v, trigger e d via on/off pin. top t r ace: on/ o f f signal ( 5 v/div.). bottom trace: outpu t voltage (1 v/div.). time scale: 2 ms/div. z d -019 61 rev 1.9 www. power-o ne.com page 18 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output fig. 1.8v.9 : ou tput voltage response to load current step- change (10 a ? 20 a ? 10 a) at vin = 48 v. top trace: output voltage (100 mv/div.). bottom trace: load curren t (10 a/div.). curr ent slew rate: 0. 1 a/s. co = 1 f ceramic. time scale: 0.2 ms/div. fig. 1.8v.11 : output voltage ripple (20 mv/div.) at full rated load current into a resistive load w i th co = 1 0 f tantalum + 1 f ceramic and vin = 48 v. time scale: 1 s/div. fig. 1.8v.10 : output voltage response to load current step- change (1 0 a ? 20 a ? 10 a) at vin = 48 v. to p trace: output voltage (100 m v /div.). bottom t r ace: load cur r e n t (10 a/div.). curre nt slew rat e : 5 a/s. co = 470 f p o s + 1 f ceramic. time scale: 0.2 ms/div. vo u t v so u r ce i s i c 1 f ce r a m i c capacitor 10 h sour ce ind u c t ance dc- dc co nv e r te r 33 f es r < 1 electr o l ytic c a paci t or ? sq e48 fig. 1.8v.12 : t e st setup for m easuring input reflected ripple cur r ents, i c and i s . z d -019 61 rev 1.9 www. power-o ne.com page 19 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output fig. 1.8v. 13: in put reflected- ripple current, i c ( 100 ma/div.) , measured at input terminals at full rated load current and vin = 48 v. refer t o fi g. 1.8v.12 for test setup. time scale: 1 s/div. 10 20 30 4 0 2.4 io u t [a d c ] v out [ v d c ] 0 0 1.8 1.2 0.6 fig. 1.8v.15 : output voltage vs. load current sh ow ing cur r ent limit point and converter shutd o wn point. inp u t voltage has almost no effect on current limit characteristic. fig. 1.8v.14 : input reflected-ri pple current, i s (10 ma/div.), measured t h roug h 10 h at the s ource at full rate d load cur r en t and vin = 48 v. refer t o fig. 1.8 v .12 for test setu p. time scale: 1 s/div. fig. 1.8v.16 : load curre nt (top trace , 20 a/div., 50 ms/div.) into a 10 m ? s hort circuit duri ng restart, at vin = 48 v. bott om trace (20 a/ d i v., 2 ms/div.) is an expansion of the on-time p o r tion of the top t r ace. z d -019 61 rev 1.9 www. power-o ne.com page 20 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output sqe48t30 01 5 char acteri z atio n curv es a m bi ent t e mpe r at ure [ c] 20 30 40 50 60 70 8 0 90 load c u rrent [ a dc] 0 5 10 15 20 25 30 35 500 lfm (2. 5 m/ s ) 400 lfm (2. 0 m/ s ) 300 lfm (1. 5 m/ s ) 200 lfm (1. 0 m/ s ) 100 lfm (0. 5 m/ s ) nc - 30 lfm (0. 15 m/ s ) fig. 1.5v.1 : available load current vs. ambient air temperatu r e and airflow rat e s for sqe48t300 15 converter mounted verticall y w i th air flo w ing f r om pin 3 to pin 1, mosfe t temperatu r e 120 c, vin = 48 v. note : nc ? natu ral convection load c u rrent [a dc] 0 5 10 15 20 25 30 35 effic i en cy 0.60 0.65 0.70 0.75 0.80 0.85 0.90 72 v 48 v 36 v fig. 1. 5v.3: ef ficiency vs. load current and in put voltage fo r sqe48t3 0015 converter mounte d vert ically w i th air flow ing fro m pin 3 to pin 1 at a rate of 30 0 lfm (1.5 m/s) and ta = 25 c. a m bi ent t e mpe r at ure [ c] 20 30 40 50 60 70 8 0 90 load c u rrent [ a dc] 0 5 10 15 20 25 30 35 500 lfm (2. 5 m/ s ) 400 lfm (2. 0 m/ s ) 300 lfm (1. 5 m/ s ) 200 lfm (1. 0 m/ s ) 100 lfm (0. 5 m/ s ) nc - 30 lfm (0. 15 m/ s ) fig. 1.5v. 2 : av ailable load current vs. ambient air temperat ur e and airflo w ra tes for s q e4 8t30015 converter m ounted horizontally w i t h air flow ing f r o m pin 3 to pin 1, mos f et temperatu r e 12 0 c, vin = 48 v. load c u rrent [a dc] 0 5 10 15 20 25 30 35 effic i en cy 0.65 0.70 0.75 0.80 0.85 0.90 70 c 55 c 40 c fig. 1.5v. 4 : effi ciency vs. load c u rrent and ambi ent temper ature for sqe 48t30 01 5 converter m o u n ted vertically w i th vin = 48 v and air flo w ing fr om pin 3 to pin 1 at a rate of 200 l f m (1.0 m/s ) . z d -019 61 rev 1.9 www. power-o ne.com page 21 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output load c u rrent [a dc] 0 5 10 15 20 25 30 35 p ow er di ss i pa ti on [w] 0.00 2.00 4.00 6.00 8.00 10.00 72 v 48 v 36 v fig. 1.5v.5: po w e r dissipation vs. load current and input voltage for sqe48t 3001 5 converter mounted vertically w i th air flo w ing from pin 3 to pin 1 at a rate of 300 lfm (1.5 m/s) a nd ta = 25 c. fig. 1. 5v.7: turn -on t r ansient at full rated load curren t (resistive) w i th n o output capacitor at vin = 48 v , triggered via on/ o f f pin. to p trace: on/ o ff signal (5 v/div.). bottom trace: output voltage (1 v/div.). time scale: 2 ms/div. load c u rrent [a dc] 0 5 10 15 20 25 30 35 p ow er di ss i pa ti on [w] 0.00 2.00 4.00 6.00 8.00 10.00 70 c 55 c 40 c fig. 1 . 5v.6: po w e r dissipation vs. load current and am bient temperatu r e for sqe48t3 0015 converter mount e d vertically w i th vin = 48 v and a i r flo w ing from pi n 3 to pin 1 at a r a te of 2 00 l f m (1.0 m/s). fig. 1.5v.8 : t u rn-on t r ansient at full rated load current (resistive) plus 10,000 f at vin = 48 v, trigger e d via on/off pin. top t r ace: on/ o f f signal ( 5 v/div.). bottom trace: outpu t voltage (1 v/div.). time scale: 2 ms/div. z d -019 61 rev 1.9 www. power-o ne.com page 22 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output fig. 1.5v.9 : ou tput voltage response to load current step- change (10 a ? 20 a ? 10 a) at vin = 48 v. top trace: output voltage (100 mv/div.). bottom trace: load curren t (10 a/div.). curr ent slew rate: 0. 1 a/s. co = 1 f ceramic. time scale: 0.2 ms/div. fig. 1.5v.11 : output voltage ripple (20 mv/div.) at full rated load current into a resistive load w i th co = 1 0 f tantalum + 1 f ceramic and vin = 48 v. time scale: 1 s/div. fig. 1.5v.10 : output voltage response to load current step- change (1 0 a ? 20 a ? 10 a) at vin = 48 v. to p trace: output voltage (100 m v /div.). bottom t r ace: load cur r e n t (10 a/div.). curre nt slew rat e : 5a/s. co = 470 f pos + 1 f ceramic. time scale: 0.2 ms/div. vo u t v so u r ce i s i c 1 f ce r a m i c capacitor 10 h sour ce ind u c t ance dc- dc co nv e r te r 33 f es r < 1 electr o l ytic c a paci t or ? sq e48 fig. 1.5v. 12: t e st setup for m easuring input r e flected ripple cur r ents, i c and i s . z d -019 61 rev 1.9 www. power-o ne.com page 23 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output fig. 1.5v. 13: in put reflected rip p le-current, i c (1 00 ma/div.), measured at input terminals at full rated load current and vin = 48 v. refer t o fi g. 1.5v.12 for test setup. time scale: 1 s/div. 10 20 30 4 0 2.0 io u t [a d c ] v out [ v d c ] 0 0 1.5 1.0 0.5 fig. 1.5v.15 : output voltage vs. load current sh ow ing cur r ent limit point and converter shutd o wn point. inp u t voltage has almost no effect on current limit characteristic. fig. 1.5v.14 : input reflected-ri pple current, i s (10 ma/div.), measured t h roug h 10 h at the s ource at full rate d load cur r en t and vin = 48 v. refer t o fig. 1.5 v .12 for test setu p. time scale: 1 s/div. fig. 1.5v.16 : load curre nt (top trace , 20 a/div., 50 ms/div.) into a 10 m ? s hort circuit duri ng restart, at vin = 48 v. bott om trace (20 a/ d i v., 2 ms/div.) is an expansion of the on-time p o r tion of the top t r ace. z d -019 61 rev 1.9 www. power-o ne.com page 24 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output sqe48t30 01 2 char acteri z atio n curv es a m bi ent t e mpe r at ure [ c] 20 30 40 50 60 70 8 0 90 load c u rrent [ a dc] 0 5 10 15 20 25 30 35 500 lfm (2. 5 m/ s ) 400 lfm (2. 0 m/ s ) 300 lfm (1. 5 m/ s ) 200 lfm (1. 0 m/ s ) 100 lfm (0. 5 m/ s ) nc - 30 lfm (0. 15 m/ s ) fig. 1.2v.1 : available load current vs. ambient air temperatu r e and airflow rat e s for sqe48t300 12 converter mounted verticall y w i th air flo w ing f r om pin 3 to pin 1, mosfe t temperatu r e 120 c, vin = 48 v. note : nc ? natu ral convection load c u rrent [a dc] 0 5 10 15 20 25 30 35 effic i en cy 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 72 v 48 v 36 v fig. 1.2v.3: eff i ciency vs. load current and input voltage for sqe48t3 0012 converter mounte d vert ically w i th air flow ing fro m pin 3 to pin 1 at a rate of 30 0 lfm (1.5 m/s) and ta = 25 c. a m bi ent t e mpe r at ure [ c] 20 30 40 50 60 70 8 0 90 load c u rrent [ a dc] 0 5 10 15 20 25 30 35 500 lfm (2. 5 m/ s ) 400 lfm (2. 0 m/ s ) 300 lfm (1. 5 m/ s ) 200 lfm (1. 0 m/ s ) 100 lfm (0. 5 m/ s ) nc - 30 lfm (0. 15 m/ s ) fig. 1.2v. 2 : av ailable load current vs. ambient air temperat ur e and airflo w ra tes for s q e4 8t30012 converter m ounted horizontally w i t h air flow ing f r o m pin 3 to pin 1, mos f et temperatu r e 12 0 c, vin = 48 v. load c u rrent [a dc] 0 5 10 15 20 25 30 35 effici enc y 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 70 c 55 c 40 c fig. 1.2v. 4 : effi ciency vs. load c u rrent and ambi ent temper ature for sqe 48t30 01 2 converter m o u n ted vertically w i th vin = 48 v and air flo w ing fr om pin 3 to pin 1 at a rate of 200 l f m (1.0 m/s ) . z d -019 61 rev 1.9 www. power-o ne.com page 25 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output load c u rrent [a dc] 0 5 10 15 20 25 30 35 p ow er di ss i pa ti on [w] 0.00 2.00 4.00 6.00 8.00 10.00 72 v 48 v 36 v fig. 1.2v.5: po wer dissipation vs. load cur r ent and input voltage for sqe48 t 3001 2 converter mou n ted vertically w i th air flow ing from pin 3 to pin 1 at a rate of 3 00 lfm (1.5 m/s) and ta = 25 c. fig. 1. 2v.7: turn -on t r ansient at full rated load curren t (resistive) w i th n o output capacitor at vin = 48 v , triggered via on/ o f f pin. to p trace: on/ o ff signal (5 v/div.). bottom trace: output voltage (1 v/div.). time scale: 2 ms/div. load c u rrent [a dc] 0 5 10 15 20 25 30 35 p ow er di ss i pa ti on [w] 0.00 2.00 4.00 6.00 8.00 10.00 70 c 55 c 40 c fig. 1.2v.6 : po w e r dissipation vs. load current and ambient temperatu r e for sqe48t3 0012 converter mou n ted verticall y w i th vin = 48 v and air flow ing fr om pin 3 to pin 1 at a rate of 200 lfm (1.0 m/ s). fig. 1.2v.8 : t u rn-on t r ansient at full rated load current (resistive) plus 10,000 f at vin = 48 v, trigger e d via on/off pin. top t r ace: on/ o f f signal ( 5 v/div.). bottom trace: outpu t voltage (1 v/div.). time scale: 2 ms/div. z d -019 61 rev 1.9 www. power-o ne.com page 26 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output fig. 1.2v.9 : ou tput voltage response to load current step- change (10 a ? 20 a ? 10 a) at vin = 48 v. top trace: output voltage (100 mv/div.). bottom trace: load curren t (10 a/div.). curr ent slew rate: 0. 1 a/s. co = 1 f ceramic. time scale: 0.2 ms/div. fig. 1.2v.11 : output voltage ripple (20 mv/div.) at full rated load current into a resistive load w i th co = 1 0 f tantalum + 1 f ceramic and vin = 48 v. time scale: 1 s/div. fig. 1.2v.10 : output voltage response to load current step- change (1 0 a ? 20 a ? 10 a) at vin = 48 v. to p trace: output voltage (100 m v /div.). bottom t r ace: load cur r e n t (10 a/div.). curre nt slew rat e : 5 a/s. co = 470 f p o s + 1 f ceramic. time scale: 0.2 ms/div. vo u t v so u r ce i s i c 1 f ce r a m i c capacitor 10 h sour ce ind u c t ance dc- dc co nv e r te r 33 f es r < 1 electr o l ytic c a paci t or ? sq e48 fig. 1.2v.12 : t e st setup for m easuring input reflected ripple cur r ents, i c and i s . z d -019 61 rev 1.9 www. power-o ne.com page 27 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output fig. 1.2v. 13: in put reflected rip p le-current, i c (1 00 ma/div.), measured at input terminals at full rated load current and vin = 48 v. refer t o fi g. 1.2v.12 for test setup. time scale: 1 s/div. 10 20 30 4 0 1.6 i o ut [ a dc ] v out [ v dc ] 0 0 1.2 0.8 0.4 fig. 1.2v.15 : output voltage vs. load current sh ow ing cur r ent limit point and converter shutd o wn point. inp u t voltage has almost no effect on current limit characteristic. fig. 1.2v.14 : input reflected-ri pple current, i s (10 ma/div.), measured t h roug h 10 h at the s ource at full rate d load cur r en t and vin = 48 v. refer t o fig. 1.2 v .12 for test setu p. time scale: 1 s/div. fig. 1.2v.16 : load current (top tr ace, 20 a/div., 50 ms/div.) into a 10 m ? short ci rcuit during resta r t, at vin = 48 v. bottom trace (20 a/div., 5 ms/div.) is an ex pan sion of the on-ti me portion of the top trace. z d -019 61 rev 1.9 www. power-o ne.com page 28 of 29
sqe48t30 dc-dc series data sheet 36-75 vdc input; 1.2-3.3 vdc @ 30 a output ph y s ical information (for standard and latching option) sqe48t pi nout (through-hole) top view 1 2 3 7 8 6 5 4 si de view pad/pin connect ions pa d/pin # func tio n 1 v i n (+ ) 2 o n / o f f 3 v i n ( - ) 4 v o u t ( - ) 5 s e n s e ( - ) 6 t r i m 7 s e n s e ( + ) 8 v o u t (+ ) conv erter part num b eri ng/ordering information produc t series inpu t vo ltag e mount ing scheme rated loa d current outp ut vo ltag e on/off logic maximum he ight [ht] pin le ngth [pl] sp ecial f eatu r es rohs s q e 4 8 t 3 0 0 3 3 - n g b 0 one- eighth brick format 36-7 5 v t ? t h rough- hol e 30 adc 012 ? 1.2 v 015 ? 1.5 v 018 ? 1.8 v 025 ? 2.5 v 033 ? 3.3 v n ? neg a tive p ? positive d 1 ? 0.374? g ? 0.407? a ? 0.188? b ? 0.145? 0 ? st d l ? latchi ng option t ? alternativ e t r im option (1.2 v only ) no suffix ? rohs lea d -sol der- exempti on compli ant g ? rohs compliant for all si x substanc es the e x ample ab ove describes p/n sqe48 t 3003 3-n g b0: 36 -75 v inpu t, throu gh-h o le, 30 a @ 3. 3 v output, neg ative on/ o ff logic, a 0 .145 ? pin length, ma ximum height of 0.407?, stan dard (non -latching) p r otection, and r o hs lead-solder -e xem p tion com p liance. please con sult factor y fo r the co mplete list of ava ilable options. 1 maximum h e ight option d is only available on model sqe48t 300 33-nda0 notes : 1. nuclear an d medical appli c ations - po wer- one p r oducts are not designed , intended for us e in, or autho rized for use as critical components in lif e support s y stem s, equipment used in hazardous e n vi ronments, or nuclear control sy st ems w i thout t he exp r ess w r itte n consent of the re specti ve divisional president of p o wer- one, inc. 2. techni cal re visions - the a ppearance of pro ducts, including safet y ag enc y cert ifications pictured on labels, ma y change depe ndin g on the date ma n u factured. speci f ications are subject to change w i t hout notice. ht ( max. hei g ht ) cl ( min. clea r an ce ) he ight optio n + 0 .000 [+ 0.00] -0.038 [- 0.97] + 0 .016 [+ 0.41] -0.000 [- 0.00] d 0.374 [9.5] 0.035 [0.8 9] g 0 . 4 0 7 [1 0.34] 0.035 [0.8 9] pl pin le n g th pin o p ti on 0.00 5 [0.13] a 0 . 1 8 8 [4.7 8 ] b 0 . 1 4 5 [3.6 8 ] sqe48t platform notes ? all dimensions ar e in inches [mm] ? pins 1-3 and 5-7 are ? 0.040 ? [1.0 2] w i th ? 0.07 8? [1. 98] shoulder ? pins 4 and 8 are ? 0.062 ? [1.57] w i thout sho u lder ? pin material & finish: brass alloy 360 w i th matt e tin o v er nickel ? converter weigh t: 0.72 oz [20.6 g ] z d -019 61 rev 1.9 www. power-o ne.com page 29 of 29

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