document 922-1 document 922-1 revised 06/24/11 coupled inductors C MSC1278 the MSC1278 coupled inductors are designed with high leakage inductance for use in sepic applications. the loosely coupled windings (k 0.8) improve sepic effciency by reducing circulating current and provide twice the ripple current reduction of separate inductors. these inductors offer high effciency and excellent cur - rent handling in a rugged, low cost part. they are well suited for use as a vrm inductors in high-current dc-dc converters and vrm/vrd controllers. they can also be used as two single inductors connected in series or parallel. dimensions are in inches mm core material ferrite core and winding loss go to online calculator terminations rohs compliant matte tin over nickel over phos bronze. other terminations available at additional cost. ambient temperature C40c to +85c with i rms current, +85c to +125c with derated current storage temperature component: C40c to +125c. tape and reel packaging: C40c to +80c winding to winding isolation 500 vrms resistance to soldering heat max three 40 second refows at +260c, parts cooled to room temperature between cycles moisture sensitivity level (msl) 1 (unlimited foor life at <30c / 85% relative humidity) failures in time (fit) / mean time between failures (mtbf) 38 per billion hours / 26,315,789 hours, calculated per telcordia sr-332 packaging 500/13 reel; plastic tape: 24 mm wide, 0.4 mm thick, 16 mm pocket spacing, 8.1 mm pocket depth pcb washing tested with pure water or alcohol only. for other solvents, see doc787_pcb_washing.pdf . for sepic applications typical sepic schematic refer to application note, document 639, selecting coupled inductors for sepic applications. visit http://www.coilcraft.com/apps/sepic/selector_2.cfm for the coilcraft on-line sepic inductor selector tool. 123 x recommended land p attern 0.197 5,0 0.059 1,5 0.197 5,0 0.138 3,5 0.484 12,3 max 0.484 12,3 max dash n umber dot indicates pin1 inter nal code 1 4 2 3 0.217 5,5 0.177 4,5 0.157 4,0 0.079 2,0 1 4 2 3 0.317 8,05 max 3 1 2 4 l1 l2 11 : l1 l2 q1 c1 c2 + ++ ?? d1 v out v in load us uk t aiwan china singapore +1-847-639-6400 sales@coilcraft.com +44-1236-730595 sales@coilcraft-eur ope.com +886-2-2264 3646 sales@coilcraft.com.tw +86-21-6218 8074 sales@coilcraft.com.cn + 65-6484 8412 sales@coilcraft.com.sg ? coilcraft inc. 2013 this pr oduct may not be used in medical or high risk applications without prior coilcraft appr oval. specification subject to change without notice. please check web site for latest infor mation.
document 922-2 revised 06/24/11 document 922-2 dcr srf coupling leakage isat (a) 6 irms (a) part inductance 2 max 3 typ 4 coeffcient inductance 5 10% 20% 30% both one number 1 (h) (ohms) (mhz) typ typ (h) drop drop drop windings 7 winding 8 MSC1278-103ml_ 10 20% 0.058 20 0.80 2.75 8.80 10.0 10.66 2.56 3.62 MSC1278-223kl_ 22 10% 0.096 12 0.82 5.85 6.00 6.80 7.26 1.99 2.81 MSC1278-333kl_ 33 10% 0.15 9.5 0.85 10.1 5.50 6.10 6.52 1.59 2.25 MSC1278-473kl_ 47 10% 0.18 7.8 0.83 14.5 3.70 4.34 4.60 1.45 2.05 1. when ordering, please specify termination and packaging code: MSC1278-473kld termination: l = rohs compliant matte tin over nickel over phos bronze special order: t = rohs tin-silver-copper (95.5/4/0.5) or s = non-rohs tin-lead (63/37). packaging: d = 13 machine-ready reel. eia-481 embossed plastic tape (500 parts per full reel). b = less than full reel. in tape, but not machine ready. to have a leader and trailer added ($25 charge), use code letter d instead. 2. inductance shown for each winding, measured at 100 khz, 0.1 vrms, 0 adc on an agilent/hp 4284a lcr meter or equivalent. when leads are connected in parallel, inductance is the same value. when leads are connected in series, inductance is four times the value. 3. dcr is for each winding. when leads are connected in parallel, dcr is half the value. when leads are connected in series, dcr is twice the value. 4. srf measured using an agilent/hp 4191a or equivalent. when leads are connected in parallel, srf is the same value. 5. leakage inductance is for l1 and is measured with l2 shorted. 6. dc current, at which the inductance drops the specifed amount from its value without current. it is the sum of the current fowing in both windings. 7. equal current when applied to each winding simultaneously that causes a 40c temperature rise from 25c ambient. see temperature rise calculation. 8. maximum current when applied to one winding that causes a 40c temperature rise from 25c ambient. see temperature rise calculation. 9. electrical specifcations at 25c. refer to doc 639 selecting coupled inductors for sepic applications. refer to doc 362 soldering surface mount components before soldering. l vs frequency l vs current current derating -40 -20 02 04 06 08 0 100 140 120 ambient temperature (c) 110 100 90 80 70 60 50 40 30 20 10 0 25c pe r cent of rated rms i 1 10 100 inductance (h) 0.1 1 100 10 47 h 33 h 22 h 10 h frequenc y (mhz) 1 10 100 inductance (h) 0.1 1 100 10 47 h 33 h 22 h 10 h current (a) coupled inductor core and winding loss calculator this web-based utility allows you to enter frequency, peak-to-peak (ripple) current, and i rms current to predict temperature rise and overall losses, including core loss. go to online calculator . us uk t aiwan china singapore +1-847-639-6400 sales@coilcraft.com +44-1236-730595 sales@coilcraft-eur ope.com +886-2-2264 3646 sales@coilcraft.com.tw +86-21-6218 8074 sales@coilcraft.com.cn + 65-6484 8412 sales@coilcraft.com.sg ? coilcraft inc. 2013 this pr oduct may not be used in medical or high risk applications without prior coilcraft appr oval. specification subject to change without notice. please check web site for latest infor mation. coupled inductors for sepic C MSC1278 series
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