Document 267 SPICE Model – DO1813H/-HC 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. • RVAR2 is the resistance in Ohms 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. 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) • k3, k4, and k5 are shown in the accompanying table. • 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. Specifications subject to change without notice. © Coilcraft, Inc. 2007 Document 267-1 Revised 08/03/07 Document 267 SPICE Model for Coilcraft DO1813H/-HC Power Inductors Part number DO1813P-181H DO1813P-181H DO1813P-331H DO1813P-331H DO1813P-561H DO1813P-561H DO1813P-122H DO1813P-122H DO1813P-222H DO1813P-222H DO1813P-332H DO1813P-332H DO1813P-472H DO1813P-472H DO1813P-682H DO1813P-682H DO1813P-103H DO1813P-103H DO1813P-103H DO1813P-153H DO1813P-153H DO1813P-153H DO1813P-223H DO1813P-223H DO1813P-153H DO1813P-333H DO1813P-333H DO1813P-473H DO1813P-473H Frequency limit of model (MHz) ⏲) Lower Upper R1 (⏲ 0.1 4.4 472 4.4 10 400 0.1 4.4 50000 4.4 10 697 0.1 4.4 57500 4.4 10 0.370 0.1 4.4 58800 4.4 10 0 0.1 4.4 63000 4.4 10 2.00 0.1 4.4 500000 4.4 10 0.850 0.1 4.4 21400 4.4 10 0 0.1 3.5 21400 3.5 10 0 0.1 1 1030 1 3.5 20000 3.5 10 0 0.1 1 366 1 3.5 0 3.5 10 0 0.1 1 366 1 3.5 366 3.5 10 0 0.1 2.5 379 2.5 10 100 0.1 2 100 2 10 1.00 LVAR Coefficients ⏲ ) C (pF) R2 (⏲ 0.001 835 0.001 20.0 0.004 14.0 0.004 20.6 0.003 8.02 0.004 7.30 0.001 7.17 0.002 6.73 0.001 1.51 0.001 3.71 0.040 1.95 0.037 2.43 0.001 2.16 0.050 2.02 0.001 2.16 0.001 2.50 0.001 0.944 0.001 1.82 0.001 2.59 0.001 0.777 3.08 0.970 5.16 2.14 0.001 0.777 3.91 0.777 13.7 1.54 0.253 0.00 13.6 2.11 0.264 0.00 12.7 2.10 k1 k2 1.73E-05 0.115 1.61E-05 0.076 4.85E-05 0.146 3.30E-05 0.137 8.05E-05 0.354 8.20E-05 0.354 1.85E-04 0.679 1.71E-04 0.638 3.48E-04 1.33 3.44E-04 1.28 6.67E-04 1.42 2.85E-04 1.05 9.00E-03 2.29 1.21E-03 2.58 1.03E-03 3.07 1.21E-03 2.99 6.53E-04 0.963 3.35E-03 6.89 3.35E-03 5.63 8.66E-04 1.76 7.52E-04 4.71 1.92E-03 7.83 5.76E-04 2.47 4.10E-04 4.93 8.12E-04 9.00 2.94E-04 6.26 2.00E-04 14.0 1.56E-04 7.88 1.46E-04 13.2 k3 0.180 k4 2.85E-03 0.330 7.96E-03 0.560 9.59E-03 1.15 2.30E-02 2.06 3.49E-02 3.20 5.18E-02 4.70 1.29E-01 6.80 1.65E-01 9.55 8.74 3.43E-01 3.65E-01 15.3 15.5 3.73E-01 4.44E-01 22.6 22.6 4.33E-01 5.05E-01 32.5 4.76E-01 48.1 4.69E-01 Specifications subject to change without notice. © Coilcraft, Inc. 2005 k5 L (µH) 9.38E-06 0.169 1.02E-05 0.298 9.38E-06 0.523 9.92E-06 1.06 1.03E-05 1.92 8.98E-06 2.99 1.00E-05 4.20 1.00E-05 6.18 9.40E-06 9.80E-07 8.24 8.62E-06 8.78E-06 13.8 8.62E-06 7.12E-06 20.8 9.52E-06 30.4 9.06E-06 45.9 Document 267-12 Revised 01/21/03