Document 267 SPICE Model – 1812FS This lumped-element (SPICE) model data simulates the frequency-dependent behavior of Coilcraft power inductors within the frequency range shown in the accompanying table for each individual inductor. The data represents de-embedded measurements, as described below. Effects due to different customer circuit board traces, board materials, ground planes or interactions with other components are not included and can have a significant effect when comparing the simulation to measurements of the inductors using other production verification instruments and fixtures. Lumped Element Modeling Method The value of the frequency-dependent variable resistor RVAR1 is calculated from: RVAR1 = k1 * • k1 is shown for each value in the accompanying table. • f is the frequency in Hz • RVAR1 is the resistance in Ohms The value of the frequency-dependent variable resistor RVAR2 is calculated from: RVAR2 = k2 * • k2 is shown for each value in the accompanying table. Measurements were made using a 50 Ohm impedance analyzer. Fixture compensation was performed to remove fixture effects. No DC bias current was applied in any of the measurements. The lumped element values were determined by optimizing the simulation model to an average of the measurements. This method results in a model that represents as closely as possible the typical frequency-dependent behavior of the component within the model frequency range. • f is the frequency in Hz The equivalent lumped element model schematic is shown below. Each model should only be analyzed at the input and output ports. Individual elements of the model are not determined by parameter measurement. The elements are determined by the overall performance of the lumped element model compared to the measurements taken of the component. • k3, k4, and k5 are shown in the accompanying table. RVAR2 VAR C R2 RVAR1 VAR R1 LVAR • RVAR2 is the resistance in Ohms Note:The log function in the following equation is the natural logarithm, base e, not base 10. The value of the frequency-dependent inductance LVAR is calculated from: LVAR = k3 − k4 * LOG (k5 * f) • f is the frequency in Hz • LVAR is the inductance in µH • LOG is the natural LOG (base e) Disclaimer Coilcraft makes every attempt to provide accurate measurement data and software, representative of our components, in a usable format. Coilcraft, however, disclaims all warrants relating to the use of its data and software, whether expressed or implied, including without limitation any implied warranties of merchantability or fitness for a particular purpose. Coilcraft cannot and will not be liable for any special, incidental, consequential, indirect or similar damages occurring with the use of the data and/or software. US +1-847-639-6400 [email protected] UK +44-1236-730595 [email protected] Taiwan +886-2-2264 3646 [email protected] China +86-21-6218 8074 [email protected] Singapore + 65-6484 8412 [email protected] Document 267-1 Revised 11/28/11 © Coilcraft Inc. 2012 This product may not be used in medical of high risk applications without prior Coilcraft approval. Specification subject to change without notice. Please check out web site for latest information. Document 267 SPICE Model for Coilcraft 1812FS Power Inductors Frequency limit LVAR Coefficients of model (MHz) Part number Lower Upper R1 () R2 () C (pF) k1 k2 k3k4 k5 1812FS-102 0.1 400 200 0.07 0.299 5.00E-05 0.189 1.0 3.44E-039.78E-06 1812FS-122 0.1 400 315 0.11 0.273 1.00E-05 0.239 1.2 2.41E-039.78E-06 1812FS-152 0.1300 285 0.1050.4445.00E-05 0.4091.5 0.010 9.78E-06 1812FS-222 0.1 300 420 0.12 0.326 5.00E-05 0.5762.2 0.015 9.78E-06 1812FS-242 0.1300 440 0.1750.3328.60E-05 0.7002.4 9.82E-03 9.78E-06 1812FS-272 0.1 200 360 0.2 0.370 5.00E-05 0.7612.7 0.017 9.85E-06 1812FS-332 0.1200 340 0.1850.3661.00E-06 1.02 3.3 0.027 9.94E-06 1812FS-392 0.1200 420 0.1950.3653.00E-05 1.46 3.9 0.047 9.94E-06 1812FS-472 0.1 200 360 0.15 0.4011.33E-04 1.70 4.7 0.066 9.94E-06 1812FS-562 0.1 200 360 0.33 0.3791.00E-06 2.21 5.6 0.080 9.94E-06 1812FS-682 0.1 200 260 0.35 0.4121.00E-06 2.49 6.8 0.100 9.94E-06 1812FS-103 0.1 200 160 0.55 0.344 1.00E-06 4.0510 0.070 9.90E-06 1812FS-153 0.1 100 60 0.75 0.3231.00E-06 5 15 0.100 9.90E-06 1812FS-223 0.140 70 0.853.896.00E-06 10 22 0.0801.00E-05 1812FS-333 0.1 30 70 1.1 5.06 1.00E-0614 33 0.050 1.03E-05 1812FS-393 0.1 20 77 1.1 5.41 1.30E-0416 39 0.070 1.03E-05 1812FS-473 0.1 20 115 1.2 6.53 1.80E-0426 47 0.140 1.03E-05 1812FS-683 0.1 30 390 1.8 0.730 1.00E-0725 68 0.146 9.85E-06 1812FS-104 0.1 9 90 2.5 10.0 1.00E-0628 100 0.200 1.19E-05 1812FS-154 0.1 5 106 3.8 12.6 1.00E-0654 150 0.410 1.29E-05 1812FS-224 0.1 4 105 5.4 11.9 1.00E-0769 220 0.952 1.25E-05 1812FS-274 0.1 4 80 6.5 15.3 1.00E-0790 270 1.19 1.43E-05 1812FS-3340.1485 6.88.11 1.00E-07 82 3301.531.23E-05 1812FS-3940.14 152 7.67.56 1.00E-07 120 3901.041.52E-05 1812FS-474 0.1 4 85 8.7 11.2 1.00E-07120 470 1.96 1.62E-05 1812FS-564 0.1 4 141 11.2 10.3 1.00E-07168 560 3.01 1.51E-05 1812FS-684 0.1 4 45 12.7 11.1 1.00E-07160 680 3.02 1.93E-05 1812FS-824 0.1 4 27 16.8 13.5 1.00E-07176 820 2.66 3.79E-05 1812FS-1050.14 9.5 19.58.23 1.00E-07 240 10003.572.45E-05 US +1-847-639-6400 [email protected] UK +44-1236-730595 [email protected] Taiwan +886-2-2264 3646 [email protected] China +86-21-6218 8074 [email protected] Singapore + 65-6484 8412 [email protected] Document 267-32 Revised 04/20/12 © Coilcraft Inc. 2012 This product may not be used in medical of high risk applications without prior Coilcraft approval. Specification subject to change without notice. Please check out web site for latest information.