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| Document 713-1 Coupled Inductors-LPR4012 For DC-DC converters and other applications 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 Isat and low DCR ratings of these low profile parts provide high efficiency and excellent current handling in a rugged, low cost design. Custom inductance values and turn ratios are available upon request. Part number1 LPR4012-202AML_ LPR4012-202BML_ LPR4012-202DML_ LPR4012-202LML_ LPR4012-103BML_ LPR4012-103DML_ LPR4012-223BML_ LPR4012-223DML_ Primary (L1) inductance2 20% (H) 2.0 2.0 2.0 2.0 10.0 10.0 22.0 22.0 Turns ratio 1 : 1.5 1:2 1:3 1 : 10 1:2 1:3 1:2 1:3 DCR max (Ohms) L1 L2 0.240 0.240 0.240 0.240 0.600 0.600 1.16 1.16 0.255 0.400 1.15 9.64 1.55 3.71 3.65 7.08 SRF typ3 (MHz) 61.5 49.4 31.0 7.43 19.5 12.8 11.2 8.00 Isat (A)4 10% drop 20% drop 30% drop 1.71 1.71 1.71 1.71 0.62 0.62 0.43 0.43 1.73 1.73 1.73 1.73 0.64 0.64 0.45 0.45 1.74 1.74 1.74 1.74 0.65 0.65 0.46 0.46 Irms (A)5 20C rise 40C rise 1.10 1.10 1.10 1.10 0.52 0.52 0.43 0.43 1.45 1.45 1.45 1.45 0.70 0.70 0.57 0.57 1. Please specify termination and packaging codes: LPR4012-223XMLC 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 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. Specifications subject to change without notice. Please check our website for latest information. Document 713-1 Revised 10/05/09 (c) Coilcraft, Inc. 2009 Document 713-2 Coupled Inductors - LPR4012 Series + D C L2 + VIN SW VOUT AUX - + L1 D C VOUT - - Typical Buck Converter with auxiliary output + D + L1 L2 C VOUT VIN C PWM - 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 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) Mean Time Between Failures (MTBF) 26,315,789 hours Failures in Time (FIT) 38 per one billion hours 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 - Current Derating Typical Flyback Converter 120 110 100 Dot indicates pin 1 Percent of rated current 90 80 70 60 50 40 20 10 0 -40 -20 30 Isat Irms 0 20 1 4 1 0.155 0.003 3,94 0,076 L1 2 L2 4 2 XXXX Dash number 3 3 0.0433 0.004 1,10 0,10 0.155 0.003 3,94 0,076 Recommended Land Pattern 1 4 25C 40 60 80 100 120 140 Ambient temperature (C) 45 typ 0.174 4,40 0.103 0.049 2,606 1,24 0.031 0,78 2 3 0.060 1,52 Dimensions are in inches mm 0.049 1,24 0.103 2,606 0.174 4,40 Specifications subject to change without notice. Please check our website for latest information. Document 713-2 Revised 10/05/09 (c) Coilcraft, Inc. 2009 |
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