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y5117 17a dc-dc pol data sheet 3.0v to 13.2v input ? 0.7v to 3.63v output rev. 2.6 apr 0 7 , 2005 w w w .po w er-one.com page 1 of 14 applica t ions ? low voltag e, high de nsity power sy ste m s with intermedi ate bus architect u re s (iba) fro m 3.0v to 13.2v ? servers, desktops, and p o rt able computi ng ? broad ban d, networkin g, op tical, and comm uni cat i ons sy st em s ? battery-ope ra ted equipm en t ? point-of-lo ad regul ation for high pe rform ance dsp, fpga, asic, and microp ro ce ssors ? advance d set - top boxe s ? memory bu s t e rmin ators m e mbe r of the family bene fits ? one pa rt for different input and output voltage rang es ? one pa rt with up to 17a ou tput ? red u ces n u m ber of different part s in inventory ? comp atible with conventio nal pick-and -place equipm ent features ? extra-wid e in put low voltag e rang e: 3.0v ? 13.2v ? wide -rang e p r og ramm able output: 0.7v ? 3.63v ? remote volta ge se nse ? high contin uo us outp u t current: 17a ? high curre n t den sity: 44 a/in 2 ? efficiency up to 95% ? no minim u m load re qui red ? output sh ort circuit protect i on ? start-up into prebi ased out put ? full current si nk capability for active bus termination ? remote enable (on/ off) ? small footprin t: 8 x 32 mm ? low p r ofile:1 4mm ? wide o perating tempe r atu r e ra nge ? ul6 095 0 re cogni zed, csa c22.2 no. 60950 -00 certified, an d tuv en60 95 0-1:20 01 certi f ied des c ription the y51 17 i s a serie s of hi ghly efficient point-of - loa d dc/ dc po we r converte rs i n a u n ique sip style su rfa c e mou n t packa ge, de signed to deliv er lo w volta g e s at high cu rre nts i n cl ose proximity to load s. ext r a-wid e inp u t voltage rang e, pro g rammabl e out put voltage, and fast tra n s ient respon se are ju st a few of the int egrate d featu r es th at minimize po wer sy stem co st and time to market. selection ch art mode l in p u t vo ltag e, vdc inpu t uvlo , v dc outp ut vo ltag e, vdc outp ut current, a d c y511 7p 3.0 ? 13.2 3.8 0.7 ? 3.63 17 y511 7pc 3.0 ? 13.2 4.5 0.7 ? 3.63 17 mode l numb e r s high lig hted i n y e l l o w or shad ed are n o t reco mmend ed for n e w des igns. ordering information part number de sc ription qu an tity o f y5117xx y5 1 17xx ? t 1 t ape and re el 500 y5 1 17xx ? t 2 t ape and re el 100 y5 1 17xx ? k1 evalu a tion k i t 1 mecha n ica l sampl e and eval board y5 1 17xx ? k5 sample kit 5 function al sa mples
y5117 17a dc-dc pol data sheet 3.0v to 13.2v input ? 0.7v to 3.63v output rev. 2.6 apr 0 7 , 2005 w w w .po w er-one.com 1. absolu te ma ximum ratin g s stresse s in e x cess of the absolute max i mum rating s ma y cau s e perfo rman ce degradatio n, adversely affect long - term relia bility, and cau s e perm ane nt damage to the conve r ter para mete r condit i ons/description min max units operatin g t e mperatur e ra ng e measur ed o n case (t c ase ) -40 110 c storage t e mperature (t s) -55 125 c output current 17 adc input volta ge v in reference d to pgnd -0.3 15 vdc 2. en v i ronmental and mech anical specifications para mete r condit i ons/description min nom max units sinus oid a l vi br ation jesd-b103-b 20 g w e ight 5 grams ambie n t t e mp erature r a n g e -40 85 c storage t e mperature (t s) -55 125 c mt b f calcu l ate d per t e lcordi a t e chnolog ies sr-33 2 3,020 khrs 3. electrical sp ecifica tions refer to the e v alu a tion boar d descri b e d in appen di x a. specification s apply over spe c ified inp u t voltage, output load and op eratin g temperatu r e, unless othe rwise noted. 3.1 input specifi cation s para mete r condit i ons/description min nom max units input volta ge ( v in ) at v in <5.2v, v ld o pin ne eds to be conn ected to a n e x terna l volta ge source 5.2v 3.0 13.2 vdc input curre nt v in nom , i out = 0a, enab le h i g h 40 50 madc und e rvolta ge l o ckout (uvlo) y511 7p y511 7pc rampi ng u p v in <5.2v, v ld o connecte d to v ex t = 5 .2v, 10k resistor bet w e en enab le a nd pg nd v in 5.2v, v ld o conn ected to v in v in 5.2v, v ld o conn ected to v in 2.75 3.8 4.5 vdc vdc vdc uvlo h y st ere s is 100 mvdc page 2 of 14
y5117 17a dc-dc pol data sheet 3.0v to 13.2v input ? 0.7v to 3.63v output rev. 2.6 apr 0 7 , 2005 w w w .po w er-one.com 3.2 outpu t spec ifications para mete r condit i ons/description min nom max units output voltag e rang e (v out ) v out < 0.7v in 0.7 1.3 3.63 vdc output voltag e setpoint accur a c y t r im resistors <0.1% toleranc e v out >1 .3 v v out < 1 .3v (usi ng inter nal r e fe rence) -1.2 -4.8 1.2 4.8 %v out %v out output current (i out ) v in m i n to v in m a x 0 17 a l i ne r e gu la ti on v in m i n to v in m a x 0.5 %v out loa d re gul atio n i out m i n to i out m a x 0.5 %v out t u rn-on t i me ( w h e n inp u t vol t age is ap pl ied) t o output reg u lati on ba nd rise t i me (10% to 90%) 11 5 ms ms t u rn-on t i me (turn-on vi a en abl e pin) t o output reg u lati on ba nd 15 ms dy n a m i c re gu la ti o n peak dev i atio n settling t i me v in = 13.2v, 2.5a/ s, c out = 1 ,360 f 25 ?7 5% l oad step chan ge to 1% error ba nd 5 200 %v out s output voltag e rippl e & nois e v in m i n to v in m a x , i out m i n to i out m a x bw = 20mhz 25 60 mv p-p ad mi ssi bl e lo ad c a pa ci tan c e v in m i n to v in m a x , i out m i n to i out m a x 5,000 f s w itc h i ng f r eq uenc y 510 khz t e mperature c oefficie n t 0.02 %v out / c 3.3 protec tion specifica tions para mete r condit i ons/description min nom max units outp ut o v e r curre nt prote c t ion protection t y p e non- latchi ng output current limit t h reshol d v in m i n to v in m a x 18.7 22 27 adc 3.4 feature spe c ification s para mete r condit i ons/description min nom max units enable v en able turn-on threshold open circ u it voltag e conv erter of f source c u rrent v in m i n to v in m a x enab le pi n is fl oatin g von/off is referenced to pgnd enab le pi n is c onn ected to pg nd 1.4 v in 0.55 1.5 vdc vdc vdc madc outp ut vo ltag e trim default output voltage no trim resistor 1.3 vdc t r im range v in m i n to v in m a x , i out m i n to i out m a x 0.7 3.63 vdc remote sens e voltag e dro p comp ensati o n v in m i n to v in m a x , i out m i n to i out m a x 100 mvdc page 3 of 14
y5117 17a dc-dc pol data sheet 3.0v to 13.2v input ? 0.7v to 3.63v output rev. 2.6 apr 0 7 , 2005 w w w .po w er-one.com 4. t y p i cal performance ch arac teris t ics 4.1 efficiency curv es (at roo m tempera t u r e) 60 65 70 75 80 85 90 0 1 2 3 4 5 6 7 8 9 1 01 11 2 1 31 41 5 1 6 1 7 io u t ( a ) e ffi c i en c y % v i n= 3. 3v v i n= 5. 5v v i n= 12v figure 1. effi ci enc y vs. loa d a t vou t =0.7v 70 75 80 85 90 95 0 1 2 3 4 5 6 7 8 9 10 11 1 2 13 1 4 15 1 6 17 i out ( a ) e ffi c i en c y % v i n= 3. 3v v i n= 5. 5v v i n= 12v figure 2. effi ci enc y vs. loa d a t vou t =1.3v 80 85 90 95 10 0 01 2 3456 789 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 i out ( a ) e f fi ci e n cy % v i n= 4. 5 v v i n= 5. 5 v v i n= 12 v figure 3. effi ci enc y vs. loa d a t vou t =3.3v 70 75 80 85 90 95 0. 6 0 . 9 1 . 2 1 . 5 1. 8 2 . 1 2. 4 2 . 7 3. 0 3 . 3 3. 6 v out e f f i ci e n c y % v i n= 3. 3v v i n= 5. 5v v i n= 8. 0v v i n= 9. 6v v i n= 12v figure 4. effi ci enc y vs. ou tp ut voltag e at i o u t =17 a an d differe nt i n p u t voltag es 65 70 75 80 85 90 95 3 4567 89 1 0 1 1 1 2 1 3 vi n e f f i ci e n cy % v out = 0 . 7 v v out = 1 . 3 v v out = 2 . 5 v v out = 3 . 3 v figure 5. effi cie n c y vs. in pu t v o ltag e at i o u t =1 7 a an d differe nt ou tp ut voltag es page 4 of 14
y5117 17a dc-dc pol data sheet 3.0v to 13.2v input ? 0.7v to 3.63v output rev. 2.6 apr 0 7 , 2005 w w w .po w er-one.com 4.2 y5117p turn - on chara c teristics figure 6. vin=3 . 0v, vout=0. 7 v, iout=8. 5 a . ch1 ? vo ut, ch2 ? vin figure 7. vin=5 v , vout=0.7v, i o ut=8.5 a . ch1 ? vo ut, ch2 ? vin figure 8. vin=1 3 .2v, vou t =0.7v , iout=8. 5 a . ch1 ? vo ut, ch2 ? vin figure 9. t u rn- on in tro the ou t put prebia sed t o 50 % of v out . vin=5v, vout=1. 3 v, iout= 1 7 a . ch1 ? vout 4.3 thermal der a ting cu rv es 0 2 4 6 8 10 12 14 16 18 25 35 45 55 65 75 85 t e mp erat u r e ( c) current (a) natur a l convec tion 100 lf m 200 lf m 400 lf m figure 10. t h er mal dera tin g cu r v es for the wor s t case operati ng c o n d itio ns: vin=13.2v, vo ut =3.3v page 5 of 14
y5117 17a dc-dc pol data sheet 3.0v to 13.2v input ? 0.7v to 3.63v output rev. 2.6 apr 0 7 , 2005 w w w .po w er-one.com 5. t y p i cal applications sch e matics figure 11. t y p i cal a p p licati on circuit for vin 5.2vdc. v ldo is con n ecte d to v i n page 6 of 14
y5117 17a dc-dc pol data sheet 3.0v to 13.2v input ? 0.7v to 3.63v output rev. 2.6 apr 0 7 , 2005 w w w .po w er-one.com figure 12. t y p i cal a p p licati on circuit for 5.2v dc>vin 3.0vdc . v ldo is con n e c ted to t h e ex te rnal v o l t age sou r ce. 10kohm re sistor is placed bet w een the en able pin and pg nd. page 7 of 14
y5117 17a dc-dc pol data sheet 3.0v to 13.2v input ? 0.7v to 3.63v output rev. 2.6 apr 0 7 , 2005 w w w .po w er-one.com 6. feature des c ription 6.1 enable this fun c tion allows the co nverter to b e turned on o r off remotely. th e enable pin is intern ally pulled u p to the input voltage. it is re com m ende d to control the en able pin with a n open colle cto r tran si stor. the saturati on voltage of the tran si stor sh all be le ss tha n 0.55v at 1 m a to reliably turn the c onverter off. page 8 of 14 the ena b le pin of y51 1 7 p can be lef t floating, if not use d . the enable pin of y5117p c sh all be pulled l o w until the input voltage rea c hes 6v. 6.2 internal sup p ly voltage (v ldo ) if the input v o ltage i s lo wer tha n 5.2v, then th e v ld o pin i s req u ire d to be co nn ected to an e x ternal volta g e sou r c e ( 5.2 v ). thi s volt age sh ould n o t exce ed 15 v and be cap a b l e of supplyin g 60ma. 6.3 underv oltag e lockou t the un de rvol tage lo ckout scheme moni tors th e input voltage a ppli ed to it and d oes not allo w the conve r te r to s t art when v in is less tha n the uvlo t h re shol d. whe n the i n p u t voltage i s highe r tha n 5 . 2v, the v ldo pin i s con n e c ted to the inp u t voltage. whe n the inp u t voltage is bel ow 5.2v, the v ldo pin is conne cted to an external volta ge sou r ce. uvlo tu rn -o n thre sh old i s then set with the 10kohm resi stor conn e c ted bet wee n the enable pi n and the gro und a s sh own in figure 12 . 6.4 outpu t volta g e trim the o u tput voltage i s p r e s et to 1.3v. the trim featu r e allows the u s er to a d ju st the outp u t vol t age from thi s nominal valu e. increas e v out : t r im r a ng e 1 . 3 v < v out 3.63v. an external resi stor (r tu ) is pl ace d betwee n the trim pi n and the ?vs (negative voltage sen s e) pi n. r tu = 137.5/(v out -1.3), k ? decr eas e v out : trim ran g e 0.7v v out < 1.3v. an external resi stor (r td ) is pla c e d b e twee n tri m pi n and v ref pin. r td = 110 (v re f ? 1.25) / (1.3 ? v out ) k ? note that v out cannot exce ed 0.7v in . an internal 5 v (+/-2.5% ) referen c e volt age is availa b l e from v ref (pin 19 ). alternatively, an extern al referen c e vol t age can b e use d for be tter accu ra cy (typically 1%). the extern al refe ren c e voltage shoul d be in th e ran ge fro m 1.26 v to 5.5v an d capabl e o f sup p lying 1m a. table 1. sam p l e trim r esista n ce values v out (v) r td (k ? ) r tu (k ? ) 0.7 686.3 6 , (v re f = 5v) 1.0 137 0, (v re f = 5 v ) 1.25 808 8, (v re f = 5 v ) 1.3 ------ none ? factor y defau lt ----- 1.5 690.9 5 2.5 114.6 8 3.3 68.78 6.5 outpu t cu rr ent limit whe n the o u tput load excee d s th e curre n t limit threshold, th e co nverter wi l l enter a lo w power hiccu p mode. on ce the overcu rrent is remov ed, the outp u t voltage will re cover a u toma tically. 6.6 outpu t cu rr ent limit adj u stmen t the ocp adj ustment funct i on allows greater flexibilit y to set the o u tput current limit ince ption poi nt (i li m ), from d e fault of 22a to a minimum of 14.8a u s ing an external re si stor a nd a ca pacito r . to adju s t the i lim , place the re sisto r r ocp b e twee n o c p a and o c pb pins, an d the cap a cito r c ocp between o c pa and vou t pins . do not s h ort ocpa direc t ly to ocpb. to cal c ulate r ocp and c ocp , use the eq uation s belo w : r ocp = 10(i li m -12.6 ) / (22.8 - i li m ), k ? c ocp = 414.4/r ocp - 26, nf, whe r e r ocp is on k ? table 2. sam p l e stan dard val u es for r oc p a nd c ocp i lim r ocp c ocp ~ 2 2 a o p e n non e ~ 20a 26.7k ? non e ~ 17a 7.5k ? 27nf ~ 13.5a 1k ? 390 nf 6.7 remote voltage sense this featu r e provide s im proved l oad regul ation by comp en satin g for the volta ge d r op between the outp u t of the convert e r and the lo a d .
y5117 17a dc-dc pol data sheet 3.0v to 13.2v input ? 0.7v to 3.63v output rev. 2.6 apr 0 7 , 2005 w w w .po w er-one.com 7. pinout page 9 of 14 pin func tio n nam e 1 input volta ge v in 2 input volta ge v in 3 input volta ge v in 4 input volta ge v in 5 internal su pp l y voltage v ld o 6 po w e r grou nd pgnd 7 po w e r grou nd pgnd 8 po w e r grou nd pgnd 9 po w e r grou nd pgnd 10 po w e r grou nd pgnd 11 po w e r grou nd pgnd 12 po w e r grou nd pgnd 13 po w e r grou nd pgnd 14 po w e r grou nd pgnd 15 on/off control enab le 16 output current limit adjust ocpa 17 output current limit adjust ocpb 18 output voltage v out 19 refere nce volt age (intern a l) v re f 20 output voltage adjust tr i m 21 neg a tive volt a ge sens e -v s 22 positive vo ltag e sense +v s 23 output voltage v out 24 po w e r grou nd pgnd 25 input volta ge v in 8. pin function s v in (pin 1 ? 4, 25): input v o ltage, 3 ? 13 .2v. pgnd (pin 6-14, 24): power groun d. +v s (pin 22): positive sense le ad. co nne ct to the positive poi nt clo s e to the load. -v s (pin 21 ): neg a tive voltage se nse le ad. conn ect to the negative point clo s e to the load. trim (pin 20): output voltage tri m . with no con n e c tion th e output voltage is set to 1.3 v. v ref (pin 19): internal ref e ren c e voltag e, 5v, output can b e used to gene rate o u tputs <1.3v. enable (pin 15): enable input. in ternally pulled to vin. when left floating, the converte r is ena bled (o n). with e nable con n e c ted to the gro und o r pulle d low the conve r ter is di sa ble d (off ). ocpa a nd ocpb (pins 16, 17): o u tput curre n t limit adjustm ent, using a resi stor an d a cap a cito r. v out (pin 18, 23): outp ut voltage. use pin 2 3 for high cu rrent con n e c tion to the lo ad, pi n 18 fo r ocp adju s tment. v ldo (pin 5): internal sup p ly voltage. con n e c t to a n external volta ge so urce >5 .2v, if the input voltage is belo w 5.2v.
y5117 17a dc-dc pol data sheet 3.0v to 13.2v input ? 0.7v to 3.63v output rev. 2.6 apr 0 7 , 2005 w w w .po w er-one.com 9. mecha n ical dra w i n gs a l l dime nsi ons are in m m tolera n ces: 0.5-10 0.1 10-100 0.2 0.4 (x 20) 27 . 9 4 12 3.5 3.25 8. 0 0 . 3 1. 2 0 . 1 14 0 . 3 320.3 9. 75 10 . 2 5 10 3.4 0. 25 2.5 0. 6 1.5 smt pi cku p ta b, remo v ab le t i l t s pecificatio n: <5 from ve rt i c al , af t e r a s s e m b l y 9. 1 13 . 4 0.6 2.03 pi n 1 1.27 (x 10) 1.27 (x 10) 3.55 15.7 5 sm t pi ck u p po in t figure 13. mec h anical dra w ing page 10 of 14
y5117 17a dc-dc pol data sheet 3.0v to 13.2v input ? 0.7v to 3.63v output rev. 2.6 apr 0 7 , 2005 w w w .po w er-one.com 6 9 8.6 32 10 10 6 0.8 2 (x 22) pin 1 1.27 (x 10) 1.27 (x 10) 2 . 54 2.03 1.8 1.2 4 (x 3) u nex posed therma l cop per area as soc i ated wi th eac h pad must b e free from other t r a c es figure 14. rec o m m en ded pa d sizes 0.4 5 m m ? th e r ma l via x 42 0.45 m m ? thermal via x 4 2 0 . 45 mm ? ther mal via x 56 vi+ v- vo+ figure 15. rec o m m en ded pc b la y o ut for m u ltila y e r pcb s 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 - sp ecifications are subject to change w i t hout notice. page 11 of 14
y5117 17a dc-dc pol data sheet 3.0v to 13.2v input ? 0.7v to 3.63v output rev. 2.6 apr 0 7 , 2005 w w w .po w er-one.com appendix a. setup and use of ev aluation bo ar d to tes t an d measure op eration o f a1. purpose this proced ure explain s the requi re ments fo r th e prop er h andli ng, tup, and testing of the y5117p, to ensure the p r otection of th e device. page 12 of 14 a2. ov er vie w certai n con d i t ions h a ve to be met in o r d e r to te st the function ality of this device . the y5117 p data sh eet determi ne s constraints, b o t h temperatu r e and p o wer limitations inv o lved in the testing and op eration of the unit. the s e limitation s must n o t be exceed e d . prolon ged o peratio n at elevated te mperature o r elevated p o wer o u tput can re sult in the failure of the device. a3. re feren ces all s p ec ificatio n s a r e re fe r e nc ed ag a i ns t la tes t revisio n of the data sh eet. a4. procedure a4.1 tes t equipment powe r sup p l y sho u ld be ca pabl e of deliveri n g a minimum of 2 0 a and have the overvolta ge prote c tion. load s mu st be 30a ca pa ble an d op erate at voltag es down to 0.5 v . lead l e n g th bet ween power su pply and unit und er test (uut ) and bet we en uut and load mu st be minimized, <1m is re com m ende d. additional in put ca pacita n c e may b e required u nde r spe c ific con d itions. th e am ount o f cap a cita nce requi re d is a f a ctor of in p u t impeda nce, input voltage, input voltage regul ation, an d output cu rrent. a4.2 con n e c tion of t est equipment pgnd is th e comm on dev ice g r ou nd p i n. the inp u t and outp u t ground con n e c tions a r e con necte d to this pin. optional exte r nal v o ltage r e fer e nce input (fo r output s belo w 1.3v) optiona l comp one nts on y511 7p eva l ua tion card vldo input (for op eratio n <5.2v) input v o ltage sen se measurement s tak e n from the inpu t voltage sen s e pi ns the o u tpu t r i pple measurem e nts a r e mea s ured usin g the 50 ohm s bnc the ou tput voltage measurement is ta ken fro m the outpu t v o ltage sens e pin s the p o siti v e output vo l t a g e c onn e c tion s ar e to this pin the posi t iv e input v o ltage c o nnec tion is to this p in the inpu t a nd ou tpu t ground con n e ct ion i s t o this p in
y5117 17a dc-dc pol data sheet 3.0v to 13.2v input ? 0.7v to 3.63v output rev. 2.6 apr 0 7 , 2005 w w w .po w er-one.com a4.3 de faul t settings / user adjus t m e nts of sw1, sw2, sw3 a nd option al compon ents to ac tivate devic e (enab l e), set sw2 pin 7 to off positio n, to disabl e the unit set pin 7 to on. whe n ope rat i ng from an input voltage higher tha n 5.2v, sw3 pin 2 sho u ld be set to on. otherwi se, sw 3 pin 1 s h ou ld b e s e t to o f f and a n e x te rn al voltage source hi ghe r than 5.2v n eed s to b e c o nn ec te d to v ldo pins (p9 and p10 i n th e schemati c ). this voltage must not exceed 15v an d be ca pabl e of supplyin g 60 ma. to adju s t o c p (overcurre n t protectio n ) v a lue (default ~22a ) set s w 1 pin 1 an d pin 2 to o n p o sition, th en place a 080 5 re sisto r o n pad r17 and a 08 05 cap a cito r o n pad c1 1. re fer to the o c p adju s tment se ction of the data sheet f o r the req u ire d value of the resi sto r and t he ca pa citor. the output v o ltage of 1.3 v (f actory de fault) req u ire s sw2 pins 1 t o 6 to be swit che d off. to chan ge th e outp u t volta ge to 3.3v, 2 . 5v, 1.8v, or 1.5v, a singl e switch n e e d s to be set on of s w 2 pins 6 to 3 res p ec tively. note: only o ne switch fro m pin 6 to pi n 1 can b e se t on at any on e time. if a voltage hi gher tha n 1.3 v not referre d to above is requi re d, the n set s w 2 pi n 6 to o n a n d re pla c e r1 1 and/or r6 with re sisto r s req u ired to achi eve the desi r ed out put. refe r to the o u tput voltag e adju s tment section of the data sh eet for value of resi sto r ( s ) re quire d. to a c hi eve a n outp u t volta ge of l e ss tha n 1.3v, s w 3 pin 1 is set to on, then 0.7 v or 1.0v can be sele cted with sw2, pin 1 or 2 re sp ectively. if a voltage lowe r than 1.3v not refe rred to above i s requi re d, the n set sw3 p i n 1 to o n , sw2 pin 1 t o on an d re p l ace re sisto r s r1 4 and/ or r01 with resi sto r s req u ired to ach i eve the desire d output. refer to the output voltag e adju s tme n t se ction of th e data sh eet for value of resi stor (s ) re quir ed. external refe ren c e volta g e ca n be u s ed to in crea se accuracy of the output voltage setting s. set sw3 pin 1 to off an d con n e c t the external refe rence voltage to v ref ext pins (p 13 an d p14). a4.4 turn - o n procedur e set the input powe r supply ovp (overvoltag e prote c tion ) t o 15v to e n su re no d a mage to t he y5117p on t he evaluatio n board will o c cur. ensure the input voltage sen s e le ads are co n necte d to the evaluation board terminals to provide prope r regul ation an d input voltag e stability. start the inp u t power su p p ly at no lo a d and 0v an d increa se volt age to d e si re d input voltag e, then turn o n load (p refe ra bly half load initially). in normal op eration, the y5117p is p o we red from a 12v front e n d or high -g rade b e n c he s sup p ly, with minimal lea d or tra c k len g th. if the output impeda nce of the input source i s too hi gh for the t e st setup, the n the unit may fail to start. a low impedan ce (lo w esr) capa cit o r is the n re comm end ed betwe en vin and pgnd fo r optimum setup (a s clo s e to vin a s possibl e). a4.5 mea s ur ements input voltage measure m e n ts should b e take n at vin sen s e pin s (+ & -) to i m prove accu racy. o u tpu t voltage sh oul d be mea s u r e d at vo sen s e pins (+ & -). standard shunts shoul d be used for curre n t measurement s. noi s e i s me asu r ed on b nc with a st anda rd scop e lead (5 0 ohm ) 20m hz b a n d width. minimize all lead length s for input and outp u t (to redu ce im ped ance). cap a cito rs c01, c10 and c12 are opti onal and u s e d only for th e evaluation board test setup a n d measurement s (tra ns i ents, etc.). page 13 of 14
y5117 17a dc-dc pol data sheet 3.0v to 13.2v input ? 0.7v to 3.63v output rev. 2.6 apr 0 7 , 2005 w w w .po w er-one.com a5. e v aluation board schematic and bill of material figure 16. e v al uatio n b o ard sc hema tic table 3. b o m o f the e v alu a tio n board re fe re nc e des i gna tor ve ndor de sc ription pa rt numbe r qty pol po w e r-on e pol dc-dc c o nvert e r y511 7p 1 sw 1 8 w a y, smt , d i p s w itch es 1 sw 2, sw 3 2 w a y, smt , d i p s w itch es 2 r01...r14 0805, +/-1% 14 r15,r 17 optiona l, 080 5, + / -1% r 1 6 080 5 , 10kohm 1 c 0 1 t antalum cap a citor 220 f / 10v, 20%, d, lo w esr 1 c02?c 0 4 optiona l t antalum cap a citor 1 0 v, d, lo w esr c10, c1 2 t antalum cap a citor 220 f / 35v, 20%, d, lo w esr 2 c05..c0 8 optiona l 25v, x7 r, 121 0 c 0 9 10 f , 10v, + / -10%, x7r, 1 2 1 0 1 c11, c1 4 optiona l, 50v, x7 r, 080 5 c13 1f , 10v, x7r , 10%, 080 5 1 page 14 of 14

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