Document 267 SPICE Model – LPS6235 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. Document 267-1 Revised 07/22/11 Document 267 SPICE Model for Coilcraft LPS6235 Power Inductors Frequency limit of model (MHz) Part number Lower Upper LPS6235-6820.160 LPS6235-8220.150 LPS6235-1030.140 LPS6235-1230.140 LPS6235-1530.130 LPS6235-1830.130 LPS6235-2230.130 LPS6235-3330.130 LPS6235-4730.130 LPS6235-5630.130 LPS6235-6830.130 LPS6235-8230.120 LPS6235-1040.120 LPS6235-1240.120 LPS6235-154 0.1 10 LPS6235-224 0.1 10 LPS6235-334 0.1 6.0 LPS6235-474 0.1 5.0 LPS6235-564 0.1 4.0 LPS6235-684 0.1 3.0 LPS6235-824 0.1 3.0 LPS6235-105 0.1 3.0 LPS6235-155 0.1 3.0 LPS6235-185 0.1 3.0 LPS6235-225 0.1 3.0 LPS6235-335 0.1 2.0 LPS6235-475 0.1 2.0 LPS6235-565 0.1 1.0 LPS6235-685 0.1 1.0 LPS6235-825 0.1 1.0 LPS6235-106 0.1 1.0 LVAR Coefficients R1 () R2 () C (pF) k1k2 k3 k4 k5 200 0.075 1.93 9.00E-05 2.2 6.80.06 9.85E-06 178 0.0952.531.80E-04 2.568.20.109.85E-06 115 0.1002.851.00E-04 3.22 10 0.119.88E-06 75 0.1103.241.80E-04 3.74 12 0.179.92E-06 50 0.1253.793.00E-04 4.95 15 0.199.92E-06 65 0.1403.062.20E-04 5.76 18 0.229.92E-06 45 0.1453.322.60E-04 6.68 22 0.249.92E-06 14 0.1803.612.80E-04 7.74 33 0.369.92E-06 13 0.2454.001.40E-0310.247 0.689.80E-06 12 0.2803.921.00E-0312.456 0.889.90E-06 14 0.3453.914.00E-0416.268 0.929.99E-06 20 0.3153.134.00E-0417.082 0.909.97E-06 20 0.3752.867.50E-0420.2 100 0.929.94E-06 22 0.4353.219.00E-0426.6 120 0.941.00E-05 18 0.535 3.85 1.90E-03 30.0150 1.2 1.00E-05 24 0.72 3.64 1.20E-03 41.0220 1.8 1.02E-05 100 1.02 4.19 6.00E-04 67.0330 2.5 1.06E-05 130 1.58 5.05 4.00E-04 96.0470 2.8 1.15E-05 70 1.75 5.18 1.60E-03102 560 3.2 1.19E-05 190 1.97 4.67 2.00E-03131 680 3.4 1.25E-05 160 2.70 6.00 2.60E-03178 820 4.7 1.37E-05 120 3.20 5.20 3.80E-03 2151000 5.5 1.42E-05 180 4.60 4.72 4.20E-03 3031500 7.7 1.68E-05 120 5.42 5.41 6.90E-03 3801800 8.0 2.30E-05 70 6.40 5.52 9.50E-03 4352200 8.8 3.18E-05 180 8.90 6.67 1.10E-02 6403300 19.3 4.26E-05 30 14.0 5.76 1.10E-021200 4700 18.0 1.55E-04 250 16.4 6.82 1.10E-021100 5600 22.0 4.25E-04 50 21.4 5.72 1.20E-021500 6800 30.0 3.02E-04 60 24.0 6.62 1.50E-021600 8200 35.0 1.32E-03 60 29.0 8.05 1.40E-02 170010000 50.0 4.59E-03 Document 267-70 Revised 04/12/11