The transmission line model in LTSPICE is probably meant to represent a signal line, not a power line. If your lengths are less than 1/10 of a wavelength (so less than about 60 km), I would think that just using a single lumped RLC model instead of the LTRA elemenat should get you a close-enough solution.
How does the lossy transmission line model work?
The operation of the lossy transmission line model (LTRA) is based on the convolution of the transmission line’s impulse responses with its inputs. The length of the transmission line (LEN) must be specified. Setting any of the NOCONTROL, NOSTEPLIMIT and TRUNCDONTCUT flags increases simulation speed but may affect the accuracy of the results.
Is there a way to simulate transmission lines in spice?
\\$\\begingroup\\[email protected] I would be surprised if a modern SPICE implementation used a long RLC network to simulate transmission lines. A much better solution if you don’t care about the actual state inside the transmission line is to use a 2-port network which captures the solution to the telegrapher’s equation: see here\\$\\endgroup\\$
Where can I find the simulation-ready lossy transmission line component (LTRA)?
The simulation-ready lossy transmission line component ( LTRA) can be found in the Simulation Transmission Line integrated library (\\Library\\Simulation\\Simulation Transmission Line.IntLib). You can easily create and reference your own model file.
What devices are included in LTspice?
Included in the download of LTspice are macromodels for a majority of Analog Devices switching regulators, amplifiers, as well as a library of devices for general circuit simulation.
Why use LTspice to simulate switching regulators?
Our enhancements to SPICE have made simulating switching regulators extremely fast compared to normal SPICE simulators, allowing the user to view waveforms for most switching regulators in just a few minutes. This video provides an overview of the advantages of using LTspice in an analog circuit design and how easy it is to get started.
