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Using Coilcraft's Advanced Models in LTSpice
Coilcraft’s power inductors are included the LTSpice inductor library.
These simple inductor models are adequate for many simulations, such as low-frequency, well-below-resonance power supply simulations. When resonance and other higher-frequency effects and losses are to be simulated, these simple models will not provide the required detail and may lead to false conclusions.
More advanced inductor models available here.
Depending on the inductor series, the advanced SPICE models may include a variable inductor element, variable series resistance (Rvar1) to model skin effect, a resistor element in series with the parallel capacitance (R1) to limit impedance at resonance, and a variable parallel resistance (Rvar2) to model frequency-dependent low power core losses.
The schematic, element values, and coefficients for variable elements are provided in the PSPICE model document for each inductor series.
The GLaplace component is used in SPICE to describe a frequency-dependent impedance or resistance. Each frequency-dependent element (Rvar1, Rvar2, Lvar) is modeled in LTSpice using the GLaplace (g or g2) component.
Instructions for Creating the Model Schematic in LTSpice
Example Schematic and Netlist
The schematic below uses the Coilcraft LPS4018-332 as an example:
This is the corresponding netlist for the example schematic:
* Coilcraft LPS4018-332 3.3 uH Inductor Advanced Model
When running simulations, note the upper and lower frequency limits for which the model is valid. This information is shown on the Coilcraft SPICE model document for each inductor series.
To plot inductance vs. frequency, use the statement: