### SPICE

Document 267
SPICE Model – EPL3015
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.
* LOG (k5 * f)
Document 267-1 Revised 11/20/09
Document 267
SPICE Model for Coilcraft EPL3015 Power Inductors
Part number
EPL3015-221
EPL3015-401
EPL3015-601
EPL3015-102
EPL3015-122
EPL3015-152
EPL3015-222
EPL3015-332
EPL3015-472
EPL3015-562
EPL3015-682
EPL3015-822
EPL3015-103
EPL3015-153
EPL3015-223
EPL3015-333
EPL3015-473
Frequency limit
of model (MHz)
Lower Upper
0.1
200
0.1
100
0.1
100
0.1
100
0.1
100
0.1
100
0.1
100
0.1
100
0.1
100
0.1
90
0.1
80
0.1
80
0.1
60
0.1
50
0.1
40
0.1
30
0.1
20
LVAR Coefficients
⏲)
R1 (⏲
200
180
90
80
80
70
100
50
25
15
12
15
25
35
50
100
140
⏲)
R2 (⏲
0.032
0.037
0.042
0.048
0.054
0.062
0.082
0.108
0.145
0.165
0.194
0.262
0.301
0.463
0.563
0.860
1.136
C (pF)
0.86
0.99
1.78
1.94
2.26
2.23
2.05
2.73
3.31
3.09
2.85
3.45
3.07
3.53
2.76
2.98
3.53
k1
3.00E-05
5.00E-05
1.00E-04
5.00E-05
1.00E-06
1.00E-06
1.00E-06
1.00E-06
1.00E-06
1.00E-06
1.00E-06
1.00E-06
1.00E-06
1.00E-06
1.00E-06
1.00E-06
1.00E-06
k2
0.05
0.09
0.15
0.21
0.25
0.32
0.48
0.78
1.03
1.38
1.53
1.86
2.42
3.59
5.85
8.63
10.32
k3
0.22
0.40
0.60
1.0
1.2
1.5
2.2
3.3
4.7
5.6
6.8
8.2
10
15
22
33
47
Specifications subject to change without notice.
k4
0.001
0.002
0.004
0.006
0.008
0.012
0.024
0.044
0.053
0.069
0.087
0.092
0.118
0.142
0.188
0.252
0.347
k5
9.00E-05
9.00E-06
9.00E-06
9.00E-06
9.50E-06
9.50E-06
9.80E-06
9.90E-06
9.90E-06
9.90E-06
9.90E-06
9.90E-06
9.95E-06
9.95E-06
9.95E-06
9.98E-06
9.98E-06
Document 267-65 Revised 11/20/09