SPICE

Document 267
SPICE Model – LPO2506
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 LPO2506 Power Inductors
Part number
LPO2506-472
LPO2506-682
LPO2506-103
LPO2506-153
LPO2506-223
LPO2506-333
LPO2506-473
LPO2506-472
LPO2506-682
LPO2506-103
LPO2506-153
LPO2506-223
LPO2506-333
LPO2506-473
LPO2506-683
LPO2506-104
LPO2506-154
LPO2506-224
LPO2506-334
LPO2506-474
LPO2506-684
LPO2506-105
Frequency limit
of model (MHz)
Lower Upper
0.1
4
0.1
4
0.1
4
0.1
4
0.1
3
0.1
3
0.1
2
4
10
4
10
4
10
4
10
3
10
3
10
2
10
0.1
10
0.1
8
0.1
5
0.1
4
0.1
4
0.1
3
0.1
2
0.1
1.5
LVAR Coefficients
⏲)
R1 (⏲
62
62
29
36
36
47
55
15400
7280
3600
378
391
2
3
1800
1450
5620
4700
4540
2270
2120
2120
⏲)
R2 (⏲
0.046
0.060
0.112
0.280
0.050
0.346
0.400
0.020
0.028
0.028
0.056
0.066
0.138
0.088
0.575
1.25
2.00
2.81
3.69
5.00
7.24
12.6
C (pF)
0.020
0.020
0.001
0.001
0.352
0.050
0.001
3.01
1.48
1.97
0.702
1.01
0.882
0.927
1.00
1.56
1.21
1.36
1.19
1.44
2.09
1.38
k1
2.48E-04
2.81E-04
2.44E-04
4.42E-04
1.38E-05
6.90E-07
1.35E-06
3.47E-05
2.68E-04
1.65E-07
3.30E-07
3.87E-07
1.09E-06
6.86E-07
1.42E-05
1.15E-05
5.58E-06
1.09E-05
1.09E-05
1.09E-05
1.95E-05
3.45E-05
k2
1.71
2.03
4.55
3.71
5.19
5.88
11.1
1.73
2.10
4.52
3.49
5.12
5.83
10.9
19.0
53.0
112
201
213
351
486
577
k3
4.7
6.8
10
15
22
33
47
Specifications subject to change without notice.
k4
3.33E-02
6.92E-02
5.52E-02
1.70E-01
1.70E-01
3.85E-01
1.96E-01
k5
8.94E-06
9.04E-06
8.94E-06
8.94E-06
8.94E-06
8.94E-06
8.83E-06
L (µH)
4.56
6.52
9.70
14.3
21.3
31.4
46.2
68.0
100
150
220
330
470
680
999
Document 267-7 Revised 11/15/02