All Questions
38
questions
1
vote
0
answers
28
views
Getting "Too few nodes" error
While I am trying to simulate this LM5164Q buck converter IC exported from TI, I'm getting the too few nodes error. How to rectify it?
- 11
2
votes
1
answer
51
views
LTspice - using an encrypted file
Is there a way to use a TI encrypted file in LTspice, specifically the TI PN TPSM63610?
- 21
1
vote
0
answers
806
views
How do I properly import a .lib description into a LTspice symbol?
I am trying to simulate the TI part TPS62808 in LTspice, Pspice for TI, and Tina TI. I managed to easily run the simulation in the latter two simulators, but the models were specifically made for them,...
1
vote
0
answers
62
views
Unable to find Gvd of a buck converter using LTspice
I'm trying to simulate a closed-loop buck converter in LTspice. I'm using ideal components. I started by finding the Gvd of the buck converter (duty to output transfer function). I used the .ac ...
0
votes
1
answer
579
views
TL494 step-down converter high voltage LTSpice
I have tried to make LTSpice of step down DC-DC converter, however I cannot get it to work. I suspect the schematic is good however either LTSpice model is not correct or I made some critical mistake.
...
- 145
0
votes
0
answers
179
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DC/DC split rail converter like TI's Fly-Buck™ coupled inductor topology but with a non-inverting buck converter
Introduction
First of all, I hope you can read this through. It's rather long!
I was trying to design a DC/DC converter for a Class-D amplifier that requires a 48V input and also an auxiliary 12V ...
- 33
2
votes
1
answer
152
views
Is it possible to include a behavioural source in an LTspice sub-circuit for use in a buck converter model?
I'm in the process of modelling a buck converter following the approach in Sam Ben-Yaakov's A unified SPICE compatible average model of PWM converters article in which he models a switched inductor ...
- 137
0
votes
1
answer
863
views
LTspice simulation of buck converter
I have a 12V battery and trying to connect it to a 5V MCU. To do that I need a buck converter. I have tried simulating the circuit on LTspice but I cant seem to step-down the voltage.
Given that:
...
- 51
2
votes
2
answers
2k
views
How do switches work in ltspice?
I Have set up my switch according to the rules specified, using the dot command to determine the behavior of the switch but I still get the error.
"Can't find definition of model 'S1'"
I ...
- 29
4
votes
2
answers
3k
views
LTspice Frequency Response Analyzer (FRA)
This post is a continuation of this question.
LTspice recently introduced a new feature called frequency response analyzer, see the image below.
The green box shows the symbol for FRA. If you click ...
- 2,593
6
votes
2
answers
974
views
How to measure the stability of a buck converter using LTspice
Below is my buck converter circuit. How can I check its stability using LTspice?
I need to measure GM and PM.
Is this true that a 30–60 degrees phase margin and a gain margin of 2–10 dB are desirable ...
- 2,593
1
vote
1
answer
1k
views
How do I decide which MOSFET to use in LTspice?
I just started learning circuit simulation using LTspice. I want to try a basic circuit such as buck converter for practice. I looked online for formulas to find the values of the required components, ...
- 51
5
votes
1
answer
371
views
Buck converter only works properly when I increase the gate voltage
I'm currently trying to simulate a buck converter but it doesn't work like it should and I don't know why.
It should decrease the voltage from 20 V to 14 V, but I only get a few volts at the output. ...
- 53
1
vote
1
answer
144
views
LTspice transformer and buck converter
I am trying to simulate an efficient circuit to take 120 V AC at 60 Hz and convert it to 5 V, 5 A. I have a transformer and rectifier circuit to get the 120 V down to about 12.6 V DC and I made a buck ...
- 11
2
votes
1
answer
109
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Model skyworks si3404 DC DC converter in spice from basic diagram (can it be modeled)
I have a DC DC converter that I'd like to model, I am not a super expert in DC DC converter design (never took the class). The manufacturer provides little to none information on using the chip in a ...
- 85k