? coilcraft, inc. 2010 specifications subject to change without notice. please check our website for latest information. document 704-1 document 704-1 revised 08/31/09 the msd1278t series of coupled inductors was de- signed for high temperature applications ? up to 125c. the excellent coupling coefficient (k 0.94) makes it ideal for use in sepic applications. in sepic topolo- gies, the required inductance for each winding in a coupled inductor is half the value needed for two sepa- rate inductors, allowing selection of a part with lower dcr and higher current handling. these inductors provide high inductance, high effi- ciency and excellent current handling in a rugged, low cost part. they are well suited for use as vrm induc- tors in high-current dc-dc and vrm/vrd controllers. they can also be used as two single inductors con- nected in series or parallel, as a common mode choke or as a 1 : 1 transformer. dimensions are in inches mm 123 x recommended land pattern 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 number dot indicates pin1 internal 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 0.308 0.010 7,8 0,25 3 1 2 4 l1 l2 core material ferrite terminations rohs compliant matte tin over nickel over phos bronze. other terminations available at additional cost. weight: 3.7 ? 4.4 g ambient temperature ?40c to +125c with i rms current, +125c to +165c with derated current storage temperature component: ?40c to +165c. packaging: ?40c to +80c winding to winding isolation 500 vrms resistance to soldering heat max three 40 second reflows at +260c, parts cooled to room temperature between cycles moisture sensitivity level (msl) 1 (unlimited floor 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 only pure water or alcohol recommended l1 l2 q1 c1 c2 + ++ ?? d1 v out v in load 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. coupled inductors C msd1278t for high temperature sepic applications
? coilcraft, inc. 2010 high temperature coupled inductors for sepic C msd1278t specifications subject to change without notice. please check our website for latest information. document 704-2 revised 08/31/09 document 704-2 i rms (a) inductance 2 dcr max 3 srf typ 4 i sat (a) 5 both one part number 1 (h) (ohms) (mhz) 10% drop 20% drop 30% drop windings 6 winding 7 msd1278t-472ml_ 4.7 20% 0.040 33.0 13.90 15.20 16.36 3.16 4.47 msd1278t-562ml_ 5.6 20% 0.046 30.0 13.38 14.86 15.74 2.87 4.06 msd1278t-682ml_ 6.8 20% 0.048 23.0 12.10 13.56 14.20 2.81 3.98 msd1278t-822ml_ 8.2 20% 0.055 20.0 10.30 11.52 12.20 2.76 3.90 msd1278t-103ml_ 10 20% 0.058 17.0 8.80 10.00 10.66 2.56 3.62 msd1278t-123ml_ 12 20% 0.062 15.0 8.20 9.18 9.74 2.48 3.50 msd1278t-153ml_ 15 20% 0.072 13.0 7.40 8.36 9.03 2.30 3.25 msd1278t-183ml_ 18 20% 0.080 12.0 6.50 7.38 7.86 2.18 3.08 msd1278t-223ml_ 22 20% 0.096 11.0 6.00 6.80 7.26 1.99 2.81 msd1278t-273ml_ 27 20% 0.120 10.0 5.80 6.56 7.02 1.78 2.52 msd1278t-333ml_ 33 20% 0.150 9.5 5.50 6.10 6.52 1.59 2.25 msd1278t-393ml_ 39 20% 0.161 8.5 4.70 5.26 5.60 1.54 2.18 msd1278t-473ml_ 47 20% 0.180 7.5 3.70 4.34 4.60 1.45 2.05 msd1278t-563ml_ 56 20% 0.190 7.0 3.60 4.18 4.50 1.41 2.00 msd1278t-683ml_ 68 20% 0.210 6.5 3.50 4.04 4.32 1.35 1.90 msd1278t-823ml_ 82 20% 0.280 5.0 3.30 3.72 4.02 1.16 1.65 msd1278t-104ml_ 100 20% 0.300 4.5 2.80 3.24 3.46 1.13 1.59 msd1278t-124kl_ 120 10% 0.410 4.3 2.60 2.94 3.16 0.96 1.36 msd1278t-154kl_ 150 10% 0.460 4.1 2.20 2.54 2.70 0.91 1.29 msd1278t-184kl_ 180 10% 0.510 4.0 2.10 2.42 2.58 0.86 1.22 msd1278t-224kl_ 220 10% 0.690 3.4 1.90 2.16 2.28 0.74 1.05 msd1278t-274kl_ 270 10% 0.900 3.1 1.70 1.94 2.10 0.65 0.92 msd1278t-334kl_ 330 10% 1.02 2.9 1.50 1.70 1.84 0.61 0.86 msd1278t-394kl_ 390 10% 1.12 2.7 1.40 1.60 1.70 0.58 0.82 msd1278t-474kl_ 470 10% 1.53 2.2 1.30 1.50 1.60 0.50 0.70 msd1278t-564kl_ 560 10% 1.69 2.0 1.20 1.34 1.46 0.47 0.67 msd1278t-684kl_ 680 10% 2.29 1.7 1.00 1.08 1.22 0.41 0.58 msd1278t-824kl_ 820 10% 2.55 1.4 0.900 1.04 1.18 0.39 0.55 msd1278t-105kl_ 1000 10% 2.87 1.3 0.850 0.948 1.05 0.37 0.52 1. when ordering, please specify termination and packaging code: msd1278t-105k ld 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. dc current, at which the inductance drops the specified amount from its value without current. it is the sum of the current flowing in both windings. 6. equal current when applied to each winding simultaneously that causes a 40c temperature rise from 25c ambient. see temperature rise calculation. 7. maximum current when applied to one winding that causes a 40c temperature rise from 25c ambient. see temperature rise calculation. 8. electrical specifications at 25c. refer to doc 639 ?selecting coupled inductors for sepic applications.? refer to doc 362 ?soldering surface mount components? before soldering. temperature rise calculation based on specified i rms temperature rise ( t) = winding power loss 52.6c w t = 52.6c w ( + ) dcr ii l1 2 l2 2 winding power loss = ( + ) dcr in watts (w) ii l1 2 l2 2 example 1. msd1278t-153ml (equal current in each winding) winding power loss = (2.3 + 2.3 ) 0.072 = 0.761 w t = 0.761 w 52.6c w = 40c 22 example 2. ( = 2.4 a, winding p msd1278t-153ml = 1.3 a) ii l1 l2 22 ower loss = (2.4 + 1.3 ) 0.072 = 0.536 w t = 0.536 w 52.6c w = 28.2c 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. visit www.coilcraft.com/coupledloss.
? coilcraft, inc. 2010 high temperature coupled inductors for sepic C msd1278t specifications subject to change without notice. please check our website for latest information. document 704-3 revised 08/31/09 document 704-3 typical l vs frequency typical l vs current current derating -40 -20 0 20 40 60 80 100 180 160 140 120 ambient temperature (c) percent of rated current 120 110 100 90 80 70 60 50 40 30 20 10 0 25c i sat i rms 1 10 100 1000 10000 0.01 0.1 10 1 inductance (h) frequency (mhz) 100 h 47 h 10 h 4.7 h 1000 h 470 h 1 10 100 1000 10000 0.1 1 100 10 inductance (h) current (a) 100 h 47 h 10 h 4.7 h 1000 h 470 h
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