SPICE

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