Document 267 SPICE Model – DO3308P 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. For some part numbers, two models are provided: one using a variable inductance element (LVAR) and the other using a fixed inductance value (L). Chose the one whose frequency range best suits your application. 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. •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 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 10/22/14 © Coilcraft Inc. 2014 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 267 SPICE Model for Coilcraft DO3308P Power Inductors Frequency limit LVAR Coefficients of model (MHz) Part number Lower Upper R1 () R2 () C (pF) k1 k2 k3 k4 k5 L (µH) DO3308P-472 0.1 100 143.67 0.036 2.7167.17E-09 0.6144.7 1.09E-013.60E-02 DO3308P-6820.1100 161.820.0603.144 5.34E-04 1.69 6.82.51E-016.06E-05 DO3308P-1030.1 0.7 0.000 0.0005.169.81E-07 0.787 10.02.92E-019.64E-06 DO3308P-103 0.7 10 0.0001.41 3.79 1.35E-04 1.8810.1 3.41E-011.08E-05 DO3308P-153 0.1 0.7 0.2260.049 4.90 6.47E-05 1.3815.0 2.88E-019.33E-06 DO3308P-153 0.7 10 0.0300.000 3.39 2.58E-03 3.3315.6 6.17E-019.76E-06 DO3308P-223 0.1 1 0.3180.056 2.19 3.13E-05 2.5222.0 3.64E-019.30E-06 DO3308P-223 1 10 0.0270.725 2.48 3.29E-03 5.7422.5 6.04E-019.40E-06 DO3308P-333 0.1 2.8 0.3990.084 0.00 4.28E-05 4.3333.0 5.49E-019.62E-06 DO3308P-333 2.8 10 0.39814.6 2.22 2.91E-05 6.7232.2 5.20E-011.00E-05 DO3308P-473 0.1 2.8 0.3730.076 0.00 4.16E-05 5.0147.0 8.64E-019.62E-06 DO3308P-473 2.8 10 0.15831.4 2.82 3.43E-05 8.93 42.3 DO3308P-683 0.1 1.8 0.1500.101 0.00 1.70E-07 7.3068.0 6.71E-019.80E-06 DO3308P-683 1.8 10 0.15121.9 3.01 2.20E-05 11.8 64.2 DO3308P-104 0.1 0.8 0.1680.324 0.3051.73E-07 15.3 100 DO3308P-104 0.8 4 0.0760.000 1.74 2.18E-07 15.0 99.6 DO3308P-104 4 8 0.07628.6 2.65 2.15E-07 16.9 94.0 DO3308P-154 0.1 1.2 0.1000.000 1.00 8.76E-05 17.4 150 DO3308P-154 1.2 4 0.1645.35 2.55 1.10E-04 18.9 148 DO3308P-154 4 6 0.17310.7 3.24 1.18E-03 19.2 139 DO3308P-224 0.1 0.6 0.1720.340 2.76 1.74E-0730.5220 1.12E-011.00E-05 DO3308P-224 0.6 44900.000 3.60 2.28E-07 30.1 219 DO3308P-334 0.1 1.2 112001.32 4.13 2.36E-07 76.5 330 DO3308P-334 1.2 3.5 8202.32 3.65 7.14E-05 44.0 330 DO3308P-474 0.1 1.2 47701.76 4.03 2.82E-07 123 470 DO3308P-474 1.2 3 103020.0 3.68 3.57E-07 93.2 474 DO3308P-684 0.1 2.5 13101.32 4.57 2.82E-07 123 680 DO3308P-105 0.1 1.9 6251.19 5.34 3.18E-07 246 999 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 267-15 Revised 10/22/14 © Coilcraft Inc. 2014 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.