SPICE

Document 298
SPICE Model – 1008PS
This lumped-element (SPICE) model data simulates the
frequency-dependent behavior of Coilcraft ferrite surface
mount inductors within the frequency range shown in the
accompanying table.
The equivalent lumped element model schematic is
shown below. The element values R1, R2, C, L, k1 and k2
are listed in the table for each component value. The value
of the frequency-dependent variable resistor RVAR1 relates to the skin effect and is calculated from:
RVAR1 = k1 *
•
k1 is shown for each value in the accompanying table.
• f is the frequency in Hz
The value of the frequency-dependent variable resistor
RVAR2 relates to core losses and is calculated from:
RVAR2 = k2 *
•
•
k2 is shown for each value in the accompanying table.
f is the frequency in Hz
element model compared to the measurements taken of
the component.
Typically, the Self-Resonant Frequency (SRF) of the
component model will be higher than the measurement of
the component mounted on a circuit board. The parasitic
reactive elements of a circuit board or fixture will effectively
lower the circuit resonant frequency, especially for very
small inductance values. Since data sheet specifications
are based on typical production measurements, and the
SPICE models are based on de-embedded measurements
as described below, the model results may be different
from the data sheet specifications.
Lumped Element Modeling Method
Measurements were made using a 50 Ohm Agilent/
HP 4395A impedance analyzer with an Agilent/HP 16193
test fixture. Calibration was performed using open/short/
load standards. Fixture compensation was performed
using open and short standards.
The lumped element values were determined by matching
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.
The lumped element models were used to generate our
2-port S-parameters and therefore give identical results. The S-parameters are available on our web site
at http://www.coilcraft.com/models.cfm.
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 typical production verification instruments and fixtures.
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
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. 2009
Document 298-1 Revised 11/13/02
Document 298
SPICE Model for Coilcraft 1008PS Power Inductors
Part number
1008PS-102
1008PS-152
1008PS-182
1008PS-272
1008PS-392
1008PS-472
1008PS-562
1008PS-682
1008PS-103
1008PS-153
1008PS-223
1008PS-333
1008PS-393
1008PS-473
1008PS-683
1008PS-823
1008PS-104
1008PS-124
1008PS-154
1008PS-224
1008PS-334
1008PS-474
1008PS-564
1008PS-684
1008PS-824
1008PS-105
Frequency limit
of model (MHz)
Lower
Upper
0.1
50
0.1
45
0.1
40
0.1
30
0.1
30
0.1
25
0.1
20
0.1
16
0.1
12
0.1
10
0.1
9
0.1
9
0.1
8
0.1
8
0.1
7
0.1
6
0.1
4
0.1
4
0.1
3.5
0.1
4
0.1
2
0.1
1.8
0.1
1.5
0.1
1.3
0.1
1
0.1
1.2
R1
1210
1470
2300
1790
3380
4270
5220
4990
8980
2880
2670
1920
1790
1010
559
506
553
594
462
488
521
642
726
1150
1150
1520
R2
0.061
0.178
0.120
0.120
0.267
0.307
0.369
0.470
0.880
1.25
1.76
2.20
2.02
2.99
4.17
4.20
5.39
6.48
6.68
9.29
10.7
15.1
16.0
22.1
25.1
28.6
C (pF)
540
600
600
861
503
552
552
5.13
2.73
3.28
2.98
2.95
3.74
3.47
3.48
4.36
4.52
4.79
5.69
3.63
5.80
5.80
6.15
4.84
4.24
5.36
L (µH)
1.0
1.5
1.8
2.7
3.9
4.7
5.6
6.8
10
15
22
33
39
47
68
82
100
120
150
220
330
470
560
680
819
999
Specifications subject to change without notice.
© Coilcraft, Inc. 2009
k1
9.96E-06
8.35E-06
4.64E-05
1.97E-05
1.12E-05
1.54E-06
2.36E-06
1.18E-05
1.18E-05
1.78E-05
2.73E-05
2.81E-05
3.60E-05
3.97E-05
4.75E-05
6.44E-05
1.26E-04
1.97E-04
2.91E-04
4.65E-04
4.99E-04
5.13E-04
3.87E-04
6.95E-04
1.14E-03
1.40E-03
k2
0.655
4.22
2.11
3.37
27.0
51.0
204
6.35
12.7
18.8
27.1
41.0
41.4
56.3
71.7
77.0
97.9
111
123
172
196
251
323
403
504
568
Document 298-4 Revised 02/05/03