SPICE

Document 267
SPICE Model – LPS3015
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 LPS3015 Power Inductors
Part number
LPS3015-102
LPS3015-152
LPS3015-182
LPS3015-222
LPS3015-332
LPS3015-472
LPS3015-682
LPS3015-103
LPS3015-153
LPS3015-183
LPS3015-223
LPS3015-333
LPS3015-473
LPS3015-683
LPS3015-104
LPS3015-124
LPS3015-154
LPS3015-184
LPS3015-224
LPS3015-334
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
100
0.1
100
0.1
60
0.1
30
0.1
30
0.1
20
0.1
20
0.1
20
0.1
10
0.1
10
0.1
10
0.1
9
0.1
8
LVAR Coefficients
⏲)
R1 (⏲
290
100
95
115
85
35
70
60
20
160
560
180
70
50
70
400
360
150
1150
160
⏲)
R2 (⏲
0.075
0.10
0.10
0.11
0.13
0.20
0.30
0.44
0.70
0.75
0.825
1.30
1.55
2.25
3.40
4.60
6.10
8.60
9.50
22.0
C (pF)
0.820
2.15
1.13
2.63
1.96
1.05
2.43
1.62
1.68
2.49
3.26
2.58
2.16
2.36
2.09
3.08
5.84
3.10
6.53
4.12
k1
1.60E-04
1.10E-04
3.00E-04
1.60E-04
1.70E-04
3.10E-04
1.20E-04
9.00E-05
3.00E-05
1.00E-04
5.00E-05
1.80E-04
7.00E-04
3.00E-04
6.00E-04
1.00E-04
6.00E-04
2.50E-03
1.50E-03
4.40E-03
k2
0.369
0.389
0.510
0.590
0.650
1.25
1.38
1.96
5.20
2.40
2.98
6.50
15.0
22.0
30.0
18.0
31.5
38.0
38.0
75.0
k3
1.0
1.5
1.8
2.2
3.3
4.7
6.8
10
15
18
22
33
47
68
100
120
150
180
220
330
Specifications subject to change without notice.
© Coilcraft, Inc. 2006
k4
0.024
0.043
0.052
0.060
0.093
0.110
0.147
0.198
0.179
0.292
0.330
0.480
0.450
0.600
0.500
1.63
1.63
2.63
2.63
3.83
k5
9.80E-06
9.80E-06
9.50E-06
9.80E-06
9.80E-06
9.80E-06
9.90E-06
9.90E-06
9.95E-06
9.82E-06
9.84E-06
9.92E-06
9.90E-06
1.00E-05
1.00E-05
9.97E-06
1.02E-04
1.00E-05
1.03E-05
1.03E-05
Document 267-51 Revised 11/01/06