SPICE

Document 267
SPICE Model – DO3316T
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 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
• 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. 2009
* LOG (k5 * f)
Document 267-1 Revised 03/17/09
Document 267
SPICE Model for Coilcraft DO3316T Power Inductors
Part number
DO3316T-331
DO3316T-681
DO3316T-102
DO3316T-152
DO3316T-222
DO3316T-272
DO3316T-332
DO3316T-392
DO3316T-472
DO3316T-562
DO3316T-682
DO3316T-822
DO3316T-103
DO3316T-123
DO3316T-153
DO3316T-183
DO3316T-223
DO3316T-273
DO3316T-333
DO3316T-393
DO3316T-473
DO3316T-563
DO3316T-683
DO3316T-823
DO3316T-104
DO3316T-124
DO3316T-154
DO3316T-184
DO3316T-224
DO3316T-274
DO3316T-334
DO3316T-394
DO3316T-474
Frequency limit
of model (MHz)
Lower Upper
0.1
100
0.1
100
0.1
100
0.1
100
0.1
100
0.1
100
0.1
100
0.1
80
0.1
70
0.1
60
0.1
50
0.1
40
0.1
40
0.1
40
0.1
30
0.1
30
0.1
30
0.1
20
0.1
20
0.1
20
0.1
20
0.1
20
0.1
10
0.1
10
0.1
10
0.1
10
0.1
10
0.1
10
0.1
10
0.1
10
0.1
10
0.1
10
0.1
7
LVAR Coefficients
⏲)
R1 (⏲
400
600
675
750
960
610
420
290
375
420
200
240
165
225
155
190
125
100
115
140
110
130
100
100
65
20
20
40
10
10
10
40
30
⏲)
R2 (⏲
0.002
0.005
0.006
0.008
0.011
0.012
0.014
0.015
0.018
0.021
0.024
0.032
0.034
0.036
0.045
0.050
0.070
0.085
0.100
0.120
0.150
0.165
0.220
0.250
0.280
0.400
0.460
0.520
0.700
0.800
1.07
1.14
1.27
C (pF)
12.0
6.38
3.25
2.42
1.90
2.15
2.37
2.61
2.17
2.17
3.32
3.01
3.47
2.84
3.69
3.24
3.94
4.57
3.37
3.80
4.31
3.79
4.40
3.90
4.76
4.41
5.17
4.80
5.61
5.19
5.20
5.11
5.54
k1
2.20E-05
8.00E-05
1.10E-04
2.50E-04
3.75E-04
4.75E-06
6.75E-04
8.90E-04
1.05E-03
9.50E-04
1.20E-03
2.00E-03
3.13E-03
3.81E-03
4.36E-03
5.36E-03
7.40E-03
9.82E-03
9.80E-03
1.30E-02
1.40E-02
1.80E-02
1.90E-02
2.20E-02
2.50E-02
2.80E-02
3.20E-02
3.20E-02
3.40E-02
3.70E-02
3.70E-02
3.70E-02
5.20E-02
k2
0.157
0.473
0.569
0.960
1.058
1.489
1.80
2.30
2.42
3.24
3.58
5.25
7.04
6.70
9.44
10.4
13.8
19.2
21.2
24.3
28.1
34.0
44.0
44.0
37.0
42.8
42.0
38.2
49.8
50.3
64.7
63.8
73.5
k3
0.33
0.68
1.0
1.5
2.2
2.7
3.3
3.9
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
470
Specifications subject to change without notice.
© Coilcraft, Inc. 2009
k4
0.003
0.005
0.007
0.013
0.014
0.016
0.020
0.050
0.090
0.090
0.133
0.220
0.310
0.395
0.529
0.680
0.920
1.18
1.44
1.88
2.18
2.60
2.70
3.30
4.19
4.80
8.20
9.04
9.93
11.5
11.7
13.5
17.2
k5
9.70E-06
9.70E-06
9.70E-06
9.70E-06
9.10E-06
9.10E-06
9.00E-06
9.50E-06
9.60E-06
9.60E-06
9.65E-06
9.70E-06
9.72E-06
9.65E-06
9.75E-06
9.73E-06
9.75E-06
9.78E-06
9.80E-06
9.79E-06
9.80E-06
9.79E-06
9.81E-06
9.78E-06
9.72E-06
9.72E-06
9.77E-06
9.72E-06
9.79E-06
9.76E-06
9.84E-06
9.85E-06
9.85E-06
Document 267-49 Revised 08/29/06