Document 267 SPICE Model – MSS5131 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. 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 * Lumped Element Modeling Method • 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 be analyzed only at the input and output ports. Conclusions based on individual lumped element values may be erroneous. • k3, k4, and k5 are shown in the accompanying table. • 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 RVAR2 VAR C R2 RVAR1 VAR R1 LVAR 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. Specifications subject to change without notice. © Coilcraft, Inc. 2007 Document 267-1 Revised 08/03/07 Document 267 SPICE Model for Coilcraft MSS5131 Power Inductors Part number MSS5131-222 MSS5131-332 MSS5131-472 MSS5131-562 MSS5131-682 MSS5131-822 MSS5131-103 MSS5131-123 MSS5131-153 MSS5131-183 MSS5131-223 MSS5131-273 MSS5131-333 MSS5131-393 MSS5131-473 MSS5131-563 MSS5131-683 MSS5131-823 MSS5131-104 MSS5131-124 MSS5131-154 MSS5131-184 MSS5131-224 MSS5131-274 MSS5131-334 MSS5131-394 Frequency limit of model (MHz) Lower Upper 0.1 40 0.1 35 0.1 30 0.1 25 0.1 20 0.1 20 0.1 20 0.1 20 0.1 18 0.1 15 0.1 12 0.1 10 0.1 10 0.1 10 0.1 10 0.1 10 0.1 8 0.1 6 0.1 6 0.1 5 0.1 5 0.1 5 0.1 5 0.1 4 0.1 3 0.1 2 LVAR Coefficients ⏲) R1 (⏲ 20 63 46 52 55 52 55 43 58 52 45 42 44 30 58 68 86 104 72 66 235 34 53 150 66 445 ⏲) R2 (⏲ 0.023 0.032 0.045 0.055 0.060 0.075 0.083 0.100 0.115 0.150 0.160 0.190 0.216 0.290 0.320 0.365 0.480 0.520 0.700 0.800 1.10 1.20 1.40 1.80 2.10 2.20 C (pF) 1.44 1.70 1.68 2.35 2.24 1.70 1.72 2.30 1.96 2.44 2.09 2.57 2.78 2.41 2.01 1.83 2.57 2.97 2.72 2.47 2.73 2.49 2.79 2.00 2.14 2.84 k1 k2 8.44E-05 0.275 1.60E-06 0.545 1.39E-04 0.838 5.89E-04 1.09 2.81E-04 1.20 1.00E-06 1.22 2.28E-05 1.69 7.17E-04 1.85 1.20E-03 2.23 4.10E-03 3.18 1.07E-03 3.58 1.47E-03 5.36 5.63E-03 5.18 7.68E-03 7.43 6.50E-06 6.61 1.47E-03 7.82 7.41E-04 10.0 1.75E-03 14.4 2.35E-03 15.2 1.59E-03 15.6 2.38E-03 31.7 2.92E-03 29.0 3.80E-03 35.7 2.28E-03 44.0 3.23E-03 55.0 1.10E-02 108 k3 2.2 3.3 4.7 5.6 6.8 8.2 10 12 15 18 22 27 33 39 47 56 68 82 100 120 150 180 220 270 330 390 Specifications subject to change without notice. k4 0.024 0.075 0.096 0.126 0.147 0.170 0.206 0.445 0.448 0.490 0.523 0.66 0.79 0.97 1.10 1.03 1.26 2.46 2.04 2.61 3.46 2.87 4.16 3.49 4.85 6.92 k5 9.14E-06 9.76E-06 9.69E-06 9.37E-06 9.59E-06 9.78E-06 9.80E-06 9.64E-06 9.48E-06 8.95E-06 9.58E-06 9.64E-06 8.98E-06 9.07E-06 9.74E-06 9.60E-06 9.74E-06 9.80E-06 9.82E-06 9.85E-06 9.86E-06 9.78E-06 9.82E-06 9.85E-06 9.90E-06 9.99E-06 L (µH) Document 267-27 Revised 09/16/04