All Questions
Tagged with ltspice power-supply
41
questions
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Positive and Negative Dual Power Supply
I want to build a dual power supply board that works with 12V DC from the power adapter and gives +/-15V at its output. I came across a schematic in LT3094 datasheet on pg 30.
I am trying to simulate ...
- 187
3
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1
answer
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In LTspice, is there any way I can obtain the frequency response of power converter alone?
I am aware of the following methods. But my intention is to understand the behavior of power converter alone, before adding the controller and feedback loop.
FRA analysis: Provides the open loop ...
- 3,032
1
vote
1
answer
80
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Slow simulation on LTspice
What could be the reason for the slow simulation speed for this converter circuit I have emulated from Fig 9-5: https://www.ti.com/lit/ds/symlink/lm5145.pdf?ts=1710376974553
- 275
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LTspice, Variable Resistor
I am new to LTspice and creating circuits in the application. I want to make a variable resistor to test and observe a current limiter circuit in a DC power supply. For example, it starts at 10 ohms ...
- 652
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1
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Simulation time for Full bridge
This is a full bridge circuit which I am trying to simulate in Ltspice with a snubber. When I use ideal switches instead of MOSFETS, the simulation works fine. But when I use the real mosfet models, ...
- 275
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Flyback converter simulation in LTspice: discrepancy between Switching model and Averaged Switch model
I´m trying to make a Averaged Switch Model of a flyback converter for transient and AC simulation in LTspice. I´m following the document "Advances in Averaged Switch Modeling and Simulation" ...
- 11
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87
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Too few nodes error after running the simulation
What does "too few nodes" mean in this circuit? Any connection error? If it is some library error, please help with the solution.
- 275
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3
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204
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Is this LDO instability a real problem or a model bug? [closed]
Here is an LTSPICE simulation for which I just have an LDO (ADP7118) in its recommended environment and some reasonable parasitics. It is unstable as you can see in the transient plot (showing the ...
- 564
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71
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What is wrong with my power supply design in LTspice
What is wrong with my power supply design in LTspice?
I have re-created a Lab Power Supply design from the EEVBlog YouTube channel (see image 1) in LTSpice (see image 2).
However, when I run the ...
- 597
3
votes
1
answer
127
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What to expect from adjusting the suggested EMI filter and surge protection on a DC/DC power supply's application note. 61000-4-5
I am trying to make the CQB50W12-72S12 120VAC input capable by adding a bridge rectifier into the design that is already called out in the application note (app note and data sheet found here: https://...
user298907
2
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1
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333
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Small Signal Model of Two-Switch Forward - Basso
I've designed a two-switch forward converter, that I would like to create a small signal model for to examine the stability criteria of the converter and then compatibility with the EMI filter...
A ...
- 21
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721
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How to add MOV in LTspice
I am using LTspice for my simulation, in that we are using MOVs and common mode coil so we are trying to do simulation for that. How can we do that? And where can I get the models for MOVs and common ...
- 11
3
votes
2
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532
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Buck Converter Compensation and Transient Response
I am trying to compensate a buck converter. I've set up an averaged model of a buck converter in LTSpice.
Here is a picture of the simulation. The B3 voltage takes into account the gain from using a 5 ...
- 101
4
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2
answers
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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
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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