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| Document 580-1 Coupled Inductors-LPD4012 For SEPIC and other Applications The LPD4012 coupled miniature shielded inductors are only 1,1 mm high and 4 mm square. Their excellent coupling coefficient (k 0.94) makes them 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. 0.155 0.003 3,94 0,076 1 4 D1 Dot indicates pin 1 + L1 C1 VIN + + VOUT 2 XXX X Dash number 0.155 0.003 3,94 0,076 3 Q1 L2 C2 Load - - Internal code Typical SEPIC schematic Refer to Application Note, Document 639, "Selecting Coupled Inductors for SEPIC Applications" 0.0433 0.004 1,10 0,10 Recommended Land Pattern 1 4 0.103 0.049 2,606 1,24 0.031 0,78 45 typ 0.174 4,40 2 3 0.060 1,52 1 L1 2 L2 4 0.049 1,24 0.103 2,606 0.174 4,40 3 Dimensions are in inches mm Core material Ferrite Core and winding loss See www.coilcraft.com/coupledloss Weight 54 - 64 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 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) 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, 0.25 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 Document 580-1 Revised 09/18/09 Specifications subject to change without notice. Please check our website for latest information. (c) Coilcraft, Inc. 2010 Document 580-2 Coupled Inductors for SEPIC Applications - LPD4012 Series Part number1 LPD4012-331NL_ LPD4012-561NL_ LPD4012-821NL_ LPD4012-152ML_ LPD4012-222ML_ LPD4012-332ML_ LPD4012-472ML_ LPD4012-562ML_ LPD4012-682ML_ LPD4012-822ML_ LPD4012-103ML_ LPD4012-153ML_ LPD4012-223ML_ LPD4012-333ML_ LPD4012-473ML_ LPD4012-683ML_ LPD4012-823ML_ LPD4012-104ML_ LPD4012-124ML_ LPD4012-154ML_ LPD4012-184ML_ LPD4012-224ML_ LPD4012-334ML_ LPD4012-474ML_ LPD4012-564ML_ Inductance2 (H) 0.33 30% 0.56 30% 0.82 30% 1.5 20% 2.2 20% 3.3 20% 4.7 20% 5.6 20% 6.8 20% 8.2 20% 10 20% 15 20% 22 20% 33 20% 47 20% 68 20% 82 20% 100 20% 120 20% 150 20% 180 20% 220 20% 330 20% 470 20% 560 20% DCR max3 (Ohms) 0.042 0.087 0.100 0.134 0.176 0.242 0.370 0.467 0.500 0.545 0.638 0.940 1.52 1.74 2.20 3.19 3.41 4.76 5.20 6.90 7.90 9.80 15.12 20.90 22.10 SRF typ4 (MHz) 255 185 130 86 70 48 39 32 31 29 25 21 15 12 8.8 7.8 7.3 6.1 5.3 4.6 4.1 3.3 2.8 2.3 2.1 Isat (A)5 10% drop 20% drop 30% drop 5.2 3.7 3.2 2.6 2.3 1.8 1.6 1.5 1.3 1.1 0.98 0.79 0.74 0.45 0.35 0.30 0.26 0.24 0.23 0.21 0.18 0.150 0.140 0.100 0.090 5.4 3.8 3.3 2.7 2.4 1.9 1.7 1.6 1.4 1.2 1.0 0.82 0.78 0.47 0.37 0.32 0.28 0.26 0.24 0.22 0.19 0.16 0.145 0.110 0.105 5.6 3.9 3.4 2.8 2.5 2.0 1.8 1.6 1.5 1.3 1.1 0.84 0.79 0.48 0.38 0.33 0.30 0.27 0.25 0.23 0.20 0.17 0.150 0.120 0.115 Irms (A) both one windings6 winding7 1.87 1.30 1.21 1.05 0.91 0.78 0.63 0.56 0.54 0.52 0.48 0.40 0.31 0.29 0.26 0.21 0.21 0.18 0.17 0.15 0.14 0.12 0.10 0.08 0.08 2.65 1.84 1.72 1.48 1.29 1.10 0.89 0.79 0.77 0.74 0.68 0.56 0.44 0.41 0.37 0.30 0.29 0.25 0.24 0.21 0.19 0.17 0.14 0.12 0.12 1. Please specify termination and packaging codes: LPD4012-564MLC 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 LPD4012-152ML: Equal current in each winding (1.05 A): Winding power loss = (1.05 2 + 1.05 2) x 0.134 = 0.296 W Temperature rise = 0.296 W x 135C = 40C W Unequal current (IL1 = 1.3 A, IL2 = 0.7 A): Winding power loss = (1.3 2 + 0.7 2) x 0.134 = 0.292 W 135C = 39.4C Temperature rise = 0.292 W x W Coupled Inductor Core and Winding Loss Calculator This web-based utility allows you to enter frequency, peak-to-peak (ripple) current, and Irms current to predict temperature rise and overall losses, including core loss. Visit www.coilcraft.com/coupledloss. Specifications subject to change without notice. Please check our website for latest information. Document 580-2 Revised 09/18/09 (c) Coilcraft, Inc. 2010 Document 580-3 Coupled Inductors for SEPIC Applications - LPD4012 Series Typical L vs Current 1000 330 H 100 H Typical L vs Frequency 1000 330 H 100 H 33 H 10 H 3.3 H 1.5 H 100 100 Inductance (H) 33 H 10 H 3.3 H 1.5 H 10 Inductance (H) 10 1 0.33 H 1 0.33 H 0.1 0.01 0.1 1 10 0.1 0.1 1 10 100 Current (A) Frequency (MHz) Typical Current Derating 120 110 100 Percent of rated current 90 80 70 60 50 40 20 10 0 -40 -20 25C 30 Isat Irms 0 20 40 60 80 100 120 140 Ambient temperature (C) Specifications subject to change without notice. Please check our website for latest information. Document 580-3 Revised 09/18/09 (c) Coilcraft, Inc. 2010 |
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