document 833-1 coupled inductors C LPD6235 for flyback and other applications document 833-1 revised 11/09/15 dimensions are in inches mm 0.079 2,00 0.138 3,5 max dash n umber inter nal code dot indicates pin 1 0.236 0.003 6,0 0,08 0.236 0.003 6,0 0,08 xxx x 14 23 recommended land p attern 0.260 6,60 0.167 4,25 0.167 4,25 0.079 2,00 0.079 2,00 0.260 6,60 0.047 1,20 45 typ 1 4 2 3 tight coupling (k 0.97) makes the LPD6235 series of coupled inductors ideal for use in a variety of circuits including fyback, multi-output buck, sepic and zeta. these coupled miniature shielded inductors are 3.5 mm high and 6.0 mm square. they provide high inductance, high effciency and excellent current handling in low cost part. they can be used as two single inductors connected in series or parallel, as a common mode choke or as a 1 : 1 transformer. 2 1 4 3 l1 l2 l1 l2 + + C C d c c t ypical fl ybac k co n ver ter v out v in sw l1 l2 ++ + CC C d d c c sw t ypical buc k con ver ter with auxiliary output v out v out au x v in t ypical zeta schematic ot i l1 l2 q c1 cc ++ CC d t ypical sepic schematic v out v in l1 l2 q c1 c c ++ CC d
document 833-2 document 833-2 revised 11/09/15 dcr srf coupling leakage 5 i sat (a) 6 i rms (a) inductance 2 max 3 typ 4 coeffcient l typ 10% 20% 30% both one part number 1 20% (h) (ohms) (mhz) typ (h) drop drop drop windings 7 winding 8 LPD6235-682mr_ 6.8 0.120 31 0.99 0.10 2.80 3.00 3.12 1.40 1.98 LPD6235-103mr_ 10 0.157 26 0.99 0.12 2.50 2.70 2.80 1.30 1.83 LPD6235-223mr_ 22 0.300 15 >0.99 0.15 1.50 1.67 1.73 0.85 1.20 LPD6235-473mr_ 47 0.620 9.7 >0.99 0.21 0.90 0.98 0.99 0.60 0.85 LPD6235-104mr_ 100 1.20 7.0 >0.99 0.45 0.62 0.72 0.74 0.40 0.56 LPD6235-474mr_ 470 3.50 3.0 >0.99 0.61 0.18 0.22 0.23 0.25 0.35 LPD6235-105mr_ 1000 7.00 1.9 >0.99 1.05 0.12 0.14 0.15 0.15 0.21 LPD6235-155mr_ 1500 10.8 1.5 >0.99 1.70 0.12 0.12 0.13 0.14 0.20 LPD6235-205mr_ 2000 16.0 1.3 >0.99 2.10 0.08 0.11 0.12 0.11 0.16 1. please specify termination and packaging codes: LPD6235-205m rc termination: r = rohs compliant matte tin over nickel over silver. special order: q = rohs tin-silver-copper (95.5/4/0.5) or p = non-rohs tin-lead (63/37). packaging: c = 7 machine-ready reel. eia-481 embossed plastic tape (350 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. d = 13 machine-ready reel. eia-481 embossed plastic tape. factory order only, not stocked (1500 parts per full reel). 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 25c that causes the specifed inductance drop 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. this information is for reference only and does not represent absolute maximum ratings. 8. maximum current when applied to one winding that causes a 40c temperature rise from 25c ambient. this information is for reference only and does not represent absolute maximum ratings. 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. 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 . core material ferrite weight 420 C 480 mg environmental rohs compliant, halogen free terminations rohs compliant matte tin over nickel over silver. other terminations available at additional cost. ambient temperature C40c to +85c with (40c rise) i rms current. maximum part temperature +125c (ambient + temp rise). storage temperature component: C40c to +125c. tape and reel packaging: C40c to +80c winding to winding isolation 100 v 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 350/7 reel; 1500/13 reel plastic tape: 16 mm wide, 0.3 mm thick, 12 mm pocket spacing, 3.68 mm pocket depth recommended pick and place nozzle od: 6.2 mm; id: 3.1 mm pcb washing tested to mil-std-202 method 215 plus an additional aqueous wash. see doc787_pcb_washing.pdf . coupled inductors C LPD6235 series
document 833-3 document 833-3 revised 11/09/15 l vs current l vs frequency 1 10 100 1000 10000 inductance (h) 01 1 100 10 frequenc y (mhz) 1000 h 1500 h 2000 h 6 h h 100 h 0 h 22 h 10 h 1000 h 6 h h 22 h 10 h 2000 h 1500 h 0 h 100 h 1 10 100 1000 10000 inductance (h) 001 01 10 1 current (a) coupled inductors C LPD6235 series
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