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| Document 661-1 Coupled Inductors-LPD3015 Series For SEPIC Applications At only 1.4 mm high and 3 mm square, the LPD3015 is Coilcraft's smallest shielded coupled inductor. The excellent coupling coefficient (k 0.97) makes it ideal for use in SEPIC applications. In SEPIC topologies, the required inductance for each winding in a coupled inductor is half the value needed for two separate inductors, allowing selection of a part with lower DCR and higher current handling. These inductors provide high efficiency and excellent current handling in a rugged, low cost part. They can also be used as two single inductors connected in series or parallel, as a common mode choke or as a 1 : 1 transformer. 0.118 0.003 3,00 0,076 1 4 D1 Dot indicates pin 1 + L1 C1 VIN + + VOUT Q1 L2 C2 Load 2 XXX Dash number 0.118 0.003 3,00 0,076 3 - - Typical SEPIC schematic Refer to Application Note, Document 639, "Selecting Coupled Inductors for SEPIC Applications" 0.055 0.004 1,4 0,1 1 4 0.094 0.040 2,30 1,02 0.022 0,54 45 typ 0.130 3,30 2 3 0.039 0,99 0.040 1,02 0.094 2,30 0.130 3,30 1 L1 2 L2 4 Dimensions are in inches mm 3 Core material Ferrite Weight 45 - 52 mg Terminations RoHS compliant silver-palladium-platinum-glass frit. Other terminations available at additional cost. Ambient temperature -40C to +85C with Irms current, +85C to +125C with derated current Storage temperature Component: -40C to +125C. Packaging: -40C to +80C Winding to winding isolation 100 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 1000/7reel; 3500/13 reel Plastic tape: 12 mm wide, 0.26 mm thick, 8 mm pocket spacing, 1.65 mm pocket depth Recommended pick and place nozzle OD: 3 mm; ID: 1.5 mm PCB washing Only pure water or alcohol recommended Document 661-1 Revised 09/18/09 Specifications subject to change without notice. Please check our website for latest information. (c) Coilcraft, Inc. 2010 Document 661-2 Coupled Inductors for SEPIC - LPD3015 Series Part number1 LPD3015-391ML_ LPD3015-561ML_ LPD3015-102ML_ LPD3015-152ML_ LPD3015-182ML_ LPD3015-222ML_ LPD3015-332ML_ LPD3015-472ML_ LPD3015-682ML_ LPD3015-103ML_ LPD3015-153ML_ LPD3015-183ML_ LPD3015-223ML_ LPD3015-333ML_ LPD3015-473ML_ LPD3015-683ML_ LPD3015-104ML_ LPD3015-124ML_ LPD3015-154ML_ LPD3015-184ML_ LPD3015-224ML_ LPD3015-334ML_ Inductance2 20% (H) 0.39 0.56 1.0 1.5 1.8 2.2 3.3 4.7 6.8 10 15 18 22 33 47 68 100 120 150 180 220 330 DCR max3 (Ohms) 0.071 0.079 0.129 0.204 0.243 0.263 0.337 0.503 0.622 1.040 1.420 1.550 1.89 2.84 4.03 6.11 8.54 9.23 12.40 15.32 18.56 27.70 SRF typ4 (MHz) 289 235 160 140 135 110 90 79 58 48 35 33 30 23 17 14 11 9.0 8.0 7.5 6.0 5.0 Isat (A)5 10% drop 20% drop 30% drop 3.2 2.7 2.0 1.6 1.5 1.5 1.0 0.86 0.77 0.58 0.49 0.46 0.42 0.34 0.28 0.24 0.20 0.19 0.16 0.15 0.13 0.11 3.3 2.8 2.1 1.7 1.6 1.6 1.1 0.87 0.78 0.59 0.50 0.47 0.43 0.35 0.29 0.25 0.21 0.20 0.17 0.16 0.14 0.12 3.4 2.8 2.2 1.8 1.6 1.6 1.2 0.88 0.79 0.60 0.51 0.48 0.44 0.36 0.30 0.26 0.22 0.20 0.18 0.17 0.15 0.12 Irms (A) both one windings6 winding7 1.45 1.37 1.08 0.86 0.78 0.75 0.67 0.54 0.49 0.38 0.32 0.31 0.28 0.23 0.19 0.16 0.13 0.13 0.11 0.10 0.09 0.07 2.05 1.94 1.52 1.20 1.10 1.05 0.94 0.76 0.69 0.53 0.46 0.44 0.40 0.32 0.27 0.22 0.19 0.18 0.16 0.14 0.13 0.10 1. Please specify termination and packaging codes: LPD3015-564MLC 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 instead. D = 13 machine-ready reel. EIA-481 embossed plastic tape. Factory order only, not stocked (3500 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. 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 Irms Winding power loss = (IL12 + IL22 ) x DCR in Watts (W) 135C Temperature rise = Winding power loss x W Examples for LPD3015-152ML: Equal current in each winding (1.2 A): Winding power loss = (1.2 2 + 1.2 2) x 0.204 = 0.301 W Temperature rise = 0.301 W x 135C = 40.6C W Unequal current (IL1 = 1.0 A, IL2 = 0.6 A): Winding power loss = (1.0 2 + 0.6 2) x 0.204 = 0.277 W 135C = 37.4C Temperature rise = 0.277 W x W Specifications subject to change without notice. Please check our website for latest information. Document 661-2 Revised 09/18/09 (c) Coilcraft, Inc. 2010 Document 661-3 Coupled Inductors for SEPIC - LPD3015 Series Typical L vs Current 1000 330 H 220 H Typical L vs Frequency 1000 330 H 220 H 100 Inductance (H) Inductance (H) 100 H 33 H 22 H 100 100 H 33 H 22 H 10 10 H 3.3 H 2.2 H 10 10 H 3.3 H 2.2 H 1 1.0 H 1 1.0 H 0.1 0.01 0.1 1 10 0.1 0.01 0.1 1 10 Current (A) Frequency (MHz) Typical Current Derating 120 110 Percent of rated current 100 90 80 70 60 50 40 20 10 0 -40 -20 Isat Irms 0 20 25C 40 30 60 80 100 120 140 Ambient temperature (C) Specifications subject to change without notice. Please check our website for latest information. Document 661-3 Revised 09/18/09 (c) Coilcraft, Inc. 2010 |
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