All Questions
55
questions
0
votes
1
answer
66
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LTspice sofware Zener diode model 3bdc missing [closed]
I cannot find any models for LTspice for Zener diode breakdown voltage of 3 V. I need Zener diode because I am trying to get simple voltage stabilizer and my load cannot handle more than 3 V. I cannot ...
- 45
1
vote
3
answers
88
views
Full wave bridge rectifier with Pi or T filter simulation won't converge
I'm designing a full wave bridge rectifier and want to compare a pi filter and T filter after the rectification. I intend to add a transformer at the input and a buck-boost converter on the output. ...
- 13
0
votes
0
answers
36
views
Effect of coupling factor in flyback converter relative to rectifying diode
I'm simulating a CCM flyback converter on ltspice, and I need some help in understanding the results when I decreased the coupling factor from 1 to 0.96.
When K=1, the voltage appearing across the ...
2
votes
2
answers
123
views
Why do the diodes make a huge difference in an RC sinewave generator circuit?
In the following LTspice simulation of a sine wave generator circuit, it cannot oscillate without D1 and D2, but as long as D1 and D2 are added, (1+R5/R6)=1.5 can also oscillate (as shown in the ...
- 21
3
votes
3
answers
438
views
Compute diode model parameters from IV curve
I'm working on a project using some 5mm through-hole LEDs that I purchased. I want to simulate my circuit in LTspice before soldering it. However, none of the built-in LEDs in LTspice are close to the ...
- 141
0
votes
3
answers
107
views
Characteristic of a Resistor/Diode Simple Circuit in LTSpice
Our teacher in class instructed us to experiment with a resistor/diode circuit in LTspice. The goal is to display the I-V characteristic of the resistor, as well as that of the diode, and test them ...
- 339
2
votes
1
answer
247
views
LTspice: Simple equation calculation error with .meas
I am trying to understand how LTspice works. I copied a file from a forum, but it bothers me that there is a calculation error in it. The diode current is not the same, even if I leave out the Rs ...
- 23
2
votes
0
answers
143
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Why am I not getting the expected simulation output in LTspice after adding bypass diodes to my PV module?
I am trying to simulate solar cells of a solar module with 72 cells and see the effects of partial shading and the activation of bypass diode. For now I am just simulating 2 cells of the PV module as ...
- 59
3
votes
1
answer
493
views
Can I model a diode with higher than usual junction voltage in LTspice using the "Eg" and "Vj" parameters?
I want to model a GaN transistor and include a diode to simulate its reverse conduction above ~2 V with an adjusted diode using the following model statement:
...
- 22.5k
4
votes
3
answers
562
views
Self-biasing diode in mixer applications
I am working to understand this application's mixer design note. An image of the mixer is shown below. It uses two transistors and a hybrid ring coupler (rat-race coupler).
What I am having trouble ...
- 181
3
votes
1
answer
476
views
LTspice simulation: voltage clamp of capacitor
I have this circuit to simulate a voltage clamp of a capacitor string:
The zener diode has a breakdown voltage of 4.7 V.
I use step param for the parallel resistor of the cap.
Here are the results ...
- 71
4
votes
1
answer
254
views
How do I turn off an LTC4359 using the SHDN pin?
I am attempting to design an Ideal Diode Controller for application in a 12 V automotive circuit using an LTC4359 as the controller. I want to implement the shutdown facility available with the ...
- 83
1
vote
1
answer
728
views
How to model reverse recovery diode in LTSpice?
I wanted to update this subject as LTspice has evolved from this post: How does LTSpice model reverse recovery time?
To sum up the above post answered by Ste Kulov:
As Ste Kulov said, LTspice allows ...
- 2,478
0
votes
1
answer
54
views
Strange simulation result: Can a rectifier diode conduct when the output terminal is open?
How does the output voltage build up for the below circuit when the terminal is open? Does LTSPICE assume any default node capacitance which gets charged- Not sure what causes the discharge/ripple in ...
- 3,032
4
votes
2
answers
1k
views
Why is capacitor discharge time higher when an LED is included?
I'm testing the discharge time of a capacitor. I found that the time is higher when an LED is present.
Circuit with a capacitance of 100mF, 10k resistance and 5V voltage. By calculating discharge ...
- 143