? coilcraft, inc. 2010 specifications subject to change without notice. please check our website for latest information. document 713-1 the lpr4012 miniature shielded coupled inductors are only 1,1 mm high and 4 mm square. the excellent coupling coefficient (k = 0.95) makes them ideal for use as flyback transformers in dc-dc converters or as coupled inductors in buck regulators to provide multiple outputs. the wide selection of turns ratios makes them suitable for a variety of voltage step-up and step-down applications. they can also be used in autotransformer applications. the high i sat and low dcr ratings of these low profile parts provide high efficiency and excellent current han- dling in a rugged, low cost design. custom inductance values and turn ratios are available upon request. document 713-1 revised 01/29/10 primary (l1) srf inductance 2 turns dcr max (ohms) typ 3 i sat (a) 4 i rms (a) 5 part number 1 20% (h) ratio l1 l2 (mhz) 10% drop 20% drop 30% drop 20c rise 40c rise lpr4012-202aml_ 2.0 1 : 1.5 0.240 0.325 61.5 1.70 1.73 1.74 1.10 1.45 lpr4012-202bml_ 2.0 1 : 2 0.240 0.480 49.4 1.70 1.73 1.74 1.10 1.45 lpr4012-202dml_ 2.0 1 : 3 0.240 1.15 31.0 1.70 1.73 1.74 1.10 1.45 lpr4012-202lml_ 2.0 1 : 10 0.240 11.62 7.43 1.70 1.73 1.74 1.10 1.45 lpr4012-103bml_ 10.0 1 : 2 0.600 1.55 19.5 0.62 0.64 0.65 0.52 0.70 lpr4012-103dml_ 10.0 1 : 3 0.600 3.71 12.8 0.62 0.64 0.65 0.52 0.70 lpr4012-223bml_ 22.0 1 : 2 1.16 3.65 11.2 0.43 0.45 0.46 0.43 0.57 lpr4012-223dml_ 22.0 1 : 3 1.16 7.08 8.00 0.43 0.45 0.46 0.43 0.57 1. please specify termination and packaging codes: lpr4012-223 x m lc termination: l = rohs compliant silver-palladium-platinum-glass frit. special order: t = rohs tin-silver-copper (95.5/4/0.5) or s = non-rohs tin-lead (63/37). packaging: c =7 machine-ready reel. eia-481 embossed plastic tape (1000 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 instea d. d =13 machine-ready reel. eia-481 embossed plastic tape. factory order only, not stocked (3500 parts per full reel). 2. inductance is measured at 100 khz, 0.1 vrms, 0 adc on an agilent/hp 4284a lcr meter or equivalent. 3. srf measured using an agilent/hp 4191a or equivalent. when leads are connected in parallel, srf is the same value. 4. dc current applied to l1, at which the inductance drops the specified amount from its value without current. 5. current applied to l1 that causes the specified temperature rise from 25c ambient. refer to doc 362 ?soldering surface mount components? before soldering. coupled inductors C lpr4012 for step-up, resonant & flyback applications
coupled inductors C lpr4012 series ? coilcraft, inc. 2010 specifications subject to change without notice. please check our website for latest information. document 713-2 0.060 1,52 0.0433 0.004 1,10 0,10 dash number dot indicates pin 1 0.155 0.003 3,94 0,076 0.155 0.003 3,94 0,076 xxxx 14 23 recommended land pattern 0.174 4,40 0.103 2,606 0.103 2,606 0.049 1,24 0.049 1,24 0.174 4,40 0.031 0,78 45 typ 1 4 2 3 2 1 4 3 l1 l2 core material ferrite weight 54 ? 64 mg terminations rohs compliant silver-palladium-platinum-glass frit. other terminations available at additional cost. ambient temperature ?40c to +85c with i rms current, +85c to +125c with derated current storage temperature component: ?40c to +125c. packaging: ?40c to +80c winding to winding isolation 100 v 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) mean time between failures (mtbf) 26,315,789 hours failures in time (fit) 38 per one billion hours packaging 1000/7 reel; 3500/13 reel plastic tape: 12 mm wide, 0.25 mm thick, 8 mm pocket spacing, 1.32 mm pocket depth recommended pick and place nozzle od: 4 mm; id: 2 mm pcb washing only pure water or alcohol recommended dimensions are in inches mm l1 l1 l2 l2 + + + + + ? ? ? ? ? d d d c c pwm c c sw typical flyback converter typical buck converter with auxiliary output v out v out v out aux v in v in -40 -20 0 20 40 60 80 100 140 120 ambient temperature (c) percent of rated current 120 110 100 90 80 70 60 50 40 30 20 10 0 i sat i rms 25c current derating document 713-2 revised 01/29/10
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