Document 833-1 Coupled Inductors LPD6235 For Flyback, SEPIC, Zeta and other Applications Tight coupling (k 0.97) makes the LPD6235 series of coupled inductors ideal for use in a variety of circuits including flyback, 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 efficiency 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. + + D L1 C L2 VOUT C VIN - SW - 0.236 0.003 6,0 0,08 + VOUT C AUX - 4 XXX X D L2 Dot indicates pin 1 1 2 Typical Flyback Converter + 0.236 0.003 6,0 0,08 + VIN 3 L1 D SW VOUT C - - Typical Buck Converter with auxiliary output Dash number Internal code D + 0.138 max 3,5 L1 Recommended Land Pattern 1 4 0.047 1,20 0.167 0.079 4,25 2,00 0.260 6,60 1 C L2 Q - C + L2 C1 Q - VOUT - Typical SEPIC schematic + VIN 0.079 2,00 0.167 4,25 0.260 6,60 0.079 2,00 2 45 typ 3 2 L1 VIN + C1 L1 C D Typical Zeta schematic C VOUT - 4 Dimensions are in L2 inches mm 3 US +1-847-639-6400 sales@coilcraft.com UK +44-1236-730595 sales@coilcraft-europe.com Taiwan +886-2-2264 3646 sales@coilcraft.com.tw China +86-21-6218 8074 sales@coilcraft.com.cn Singapore + 65-6484 8412 sales@coilcraft.com.sg Document 833-1 Revised 09/08/14 (c) Coilcraft Inc. 2018 This product may not be used in medical or high risk applications without prior Coilcraft approval. Specification subject to change without notice. Please check web site for latest information. Document 833-2 Coupled Inductors - LPD6235 Series Part number1 Inductance2 20% (H) LPD6235-682ME_ LPD6235-103ME_ LPD6235-223ME_ LPD6235-473ME_ LPD6235-104ME_ 6.8 10 22 47 100 LPD6235-474ME_ LPD6235-105ME_ LPD6235-155ME_ LPD6235-205ME_ 470 1000 1500 2000 DCR max3 (Ohms) 0.120 0.157 0.300 0.620 1.20 3.50 7.00 10.8 16.0 SRF typ4 (MHz) Coupling Leakage5 coefficient L typ typ (H) 31 26 15 9.7 7.0 0.99 0.99 >0.99 >0.99 >0.99 0.10 0.12 0.15 0.21 0.45 3.0 1.9 1.5 1.3 >0.99 >0.99 >0.99 >0.99 0.61 1.05 1.70 2.10 1. Please specify termination and packaging codes: LPD6235-205MEC Termination: E = RoHS compliant Silver-palladium-platinum-glass frit. Special order: T = RoHS tin-silver-copper (95.5/4/0.5) or S = nonRoHS 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 C 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 which the inductance drops the specified amount from its value without current. It is the sum of the current flowing in both windings. 7. Equal current when applied to each winding simultaneously that causes a 40C temperature rise from 25C ambient. See temperature rise calculation. 8. Maximum current when applied to one winding that causes a 40C temperature rise from 25C ambient. See temperature rise calculation. 9. Electrical specifications at 25C. Refer to Doc 639 "Selecting Coupled Inductors for SEPIC Applications." Refer to Doc 362 "Soldering Surface Mount Components" before soldering. 10% drop 2.80 2.50 1.50 0.90 0.62 0.18 0.12 0.12 0.08 Isat (A)6Irms (A) 20% 30% both one drop drop windings7 winding8 3.00 3.12 1.40 1.98 2.70 2.80 1.30 1.83 1.67 1.73 0.85 1.20 0.98 0.99 0.60 0.85 0.72 0.74 0.40 0.56 0.22 0.14 0.12 0.11 0.23 0.15 0.13 0.12 0.25 0.15 0.14 0.11 0.35 0.21 0.20 0.16 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. Go to online calculator. Core material Ferrite Core and winding loss Go to online calculator Weight 420 - 480 mg Environmental RoHS compliant, halogen free 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. Tape and reel packaging: -40C to +80C Winding to winding isolation 100 Vrms, one minute 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 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 with pure water or alcohol only. For other solvents, see Doc787_PCB_Washing.pdf. US +1-847-639-6400 sales@coilcraft.com UK +44-1236-730595 sales@coilcraft-europe.com Taiwan +886-2-2264 3646 sales@coilcraft.com.tw China +86-21-6218 8074 sales@coilcraft.com.cn Singapore + 65-6484 8412 sales@coilcraft.com.sg Document 833-2 Revised 009/08/14 (c) Coilcraft Inc. 2018 This product may not be used in medical or high risk applications without prior Coilcraft approval. Specification subject to change without notice. Please check web site for latest information. Document 833-3 Coupled Inductors - LPD6235 Series L vs Current L vs Frequency 10000 10000 2000 H 1500 H 1000 H 470 H 100 100 H 47 H 22 H 10 470 H 22 H 1 1 47 H 10 H 6.8 H 1 0.1 100 H 100 10 10 H 6.8 H 0.01 1500 H 1000 H 1000 Inductance (H) Inductance (H) 1000 2000 H 10 0.1 1 10 100 Frequency (MHz) Current (A) Typical Current Derating 100 90 80 70 60 50 40 30 20 10 0 25C Percent of rated current 120 110 Isat Irms -40 -20 0 20 40 60 80 100 120 140 Ambient temperature (C) US +1-847-639-6400 sales@coilcraft.com UK +44-1236-730595 sales@coilcraft-europe.com Taiwan +886-2-2264 3646 sales@coilcraft.com.tw China +86-21-6218 8074 sales@coilcraft.com.cn Singapore + 65-6484 8412 sales@coilcraft.com.sg Document 833-3 Revised 009/08/14 (c) Coilcraft Inc. 2018 This product may not be used in medical or high risk applications without prior Coilcraft approval. Specification subject to change without notice. Please check web site for latest information. Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Coilcraft: LPD6235-103MEC LPD6235-474MEC LPD6235-474MEB LPD6235-473MEB LPD6235-105MEC LPD6235155MEB LPD6235-682MEB LPD6235-223MEC LPD6235-205MEB LPD6235-103MEB LPD6235-155MEC LPD6235-105MEB LPD6235-682MEC LPD6235-205MEC LPD6235-473MEC LPD6235-223MEB