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| Document 499-1 Coupled Inductors-MSD1278 For SEPIC and other Applications The excellent coupling coefficient (k 0.94) makes the MSD1278 series of coupled inductors 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 inductance, high efficiency and excellent current handling in a rugged, low cost part. They are well suited for use as a VRM inductors in high-current DC-DC converters and VRM/ VRD controllers. 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. 0.484 max 12,3 D1 + L1 C1 Dot indicates pin1 Dash number Internal code Parts manufactured prior to Sept. 2007 were marked with only the dash number. + + VOUT 0.484 max 12,3 123 X VIN Q1 L2 C2 Load - - Typical SEPIC schematic 0.317 max 8,05 Refer to Application Note, Document 639, "Selecting Coupled Inductors for SEPIC Applications" Recommended Land Pattern 0.197 5,0 0.138 3,5 0.197 5,0 3 2 4 1 0.217 5,5 0.157 4,0 2 3 1 4 0.177 4,5 0.059 1,5 0.079 2,0 Dimensions are in inches mm 1 L1 3 2 L2 4 Designer's Kit C400 contains 3 each of all values. 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 +85C with Irms current, +85C to +125C with derated current Storage temperature Component: -40C to +125C. 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 Specifications subject to change without notice. Please check our website for latest information. Document 499-1 Revised 10/08/08 (c) Coilcraft, Inc. 2010 Document 499-2 Coupled Inductors for SEPIC - MSD1278 Series Part number1 MSD1278-472ML_ MSD1278-562ML_ MSD1278-682ML_ MSD1278-822ML_ MSD1278-103ML_ MSD1278-123ML_ MSD1278-153ML_ MSD1278-183ML_ MSD1278-223ML_ MSD1278-273ML_ MSD1278-333ML_ MSD1278-393ML_ MSD1278-473ML_ MSD1278-563ML_ MSD1278-683ML_ MSD1278-823ML_ MSD1278-104ML_ MSD1278-124KL_ MSD1278-154KL_ MSD1278-184KL_ MSD1278-224KL_ MSD1278-274KL_ MSD1278-334KL_ MSD1278-394KL_ MSD1278-474KL_ MSD1278-564KL_ MSD1278-684KL_ MSD1278-824KL_ MSD1278-105KL_ Inductance2 (H) 4.7 20% 5.6 20% 6.8 20% 8.2 20% 10 20% 12 15 18 22 27 33 39 47 56 68 82 100 120 150 180 220 270 330 390 470 560 680 820 1000 20% 20% 20% 20% 20% 20% 20% 20% 20% 20% 20% 20% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% DCR max3 (Ohms) 0.038 0.046 0.048 0.050 0.058 0.062 0.072 0.080 0.096 0.120 0.150 0.160 0.180 0.190 0.210 0.280 0.300 0.410 0.460 0.510 0.690 0.900 1.02 1.12 1.43 1.69 2.29 2.55 2.83 SRF typ4 (MHz) 32.0 25.0 24.0 18.0 16.5 14.5 11.8 10.5 9.0 8.4 7.6 6.5 6.0 5.6 5.0 4.1 3.6 3.2 3.0 2.7 2.5 2.1 2.0 1.8 1.6 1.5 1.4 1.3 1.1 Isat5 (A) 14.9 13.4 13.1 10.8 10.5 9.6 9.1 8.0 6.8 6.5 5.6 5.5 5.2 4.5 4.1 3.8 3.4 3.2 2.8 2.5 2.3 2.1 1.9 1.7 1.6 1.5 1.3 1.2 1.1 Irms (A) both one windings6 winding7 3.16 2.87 2.81 2.76 2.56 2.48 2.30 2.18 1.99 1.78 1.59 1.54 1.45 1.41 1.35 1.16 1.13 0.96 0.91 0.86 0.74 0.65 0.61 0.58 0.50 0.47 0.41 0.39 0.37 4.47 4.06 3.98 3.90 3.62 3.50 3.25 3.08 2.81 2.52 2.25 2.18 2.05 2.00 1.90 1.65 1.59 1.36 1.29 1.22 1.05 0.92 0.86 0.82 0.70 0.67 0.58 0.55 0.52 Temperature rise calculation based on specified Irms 1. When ordering, please specify termination and packaging code: MSD1278-105KLD 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 30% (typ) 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. Winding power loss = (IL12 + IL22 ) x DCR in Watts (W) 52.6C Temperature rise (t) = Winding power loss x W 52.6C t = (IL12 + IL22 ) x DCR x W Example 1. MSD1278-153ML (Equal current in each winding) Winding power loss = (2.3 2 + 2.3 2) x 0.072 = 0.761 W 52.6C = 40C t = 0.761 W x W Example 2. MSD1278-153ML (IL1 = 2.4 A, IL2 = 1.3 A) Winding power loss = (2.4 2 + 1.3 2) x 0.072 = 0.536 W t = 0.536 W x 52.6C = 28.2C 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 499-2 Revised 10/08/08 (c) Coilcraft, Inc. 2010 Document 499-3 Coupled Inductors for SEPIC - MSD1278 Series Typical L vs Current 10000 Typical L vs Frequency 10000 1000 -105 -474 1000 -105 -474 Inductance (H) 100 -104 -473 Inductance (H) 100 -104 -473 10 -103 -472 10 -103 -472 1 0.1 1 10 100 1 0.01 0.1 1 10 Current (A) Frequency (MHz) 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 499-3 Revised 10/08/08 (c) Coilcraft, Inc. 2010 |
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