4n25 is an opto or photo coupler. LED irradiating a light sensitive NPN transistor
fda217 is a photo voltaic isolator. LED irradiating an series array of photo voltaic cells?
They are two different types of components. They are used in a circuit differently
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cander shelter showed a link to an article at ""
There is considerable misinformation in that article.
It is not clear if the human(s) behind it know what they are talking about.? But I don't think it was written by a real living, breathing person.
The lack of any meaningful useful information suggests that it was written not to inform and educate, but to be clickbait.? It also says that it was written by an AI bot.? And we know what that means.
Andy
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Carlos,
VISHAY makes a number of Photovoltaic MOSFET Drivers.
VOMDA1271, VO1263xx & LH1262xx.
They also have spice models available.
Some model files even include the .asy file,
All you need is to take the time and effort to search their web site.
Mike
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On Saturday, 18 May 2024, 17:49:52 GMT+4, cander shelter via groups.io <hoopeer@...> wrote:
do LTspice have .Sens analysis (can perform the sensitivity analysis)?
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Yes, yes, I'm using it, but as I need to control a MOSFET, they suggested I switch to this other optocoupler as it would better solve the problem I'm facing. --
Em seg., 20 de mai. de 2024 ¨¤s 00:29, Andy I via <AI.egrps+io= [email protected]> escreveu:
I don't know if this helps, but are you aware that LTspice comes equipped with a 4n25 model?
Andy
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I don't know if this helps, but are you aware that LTspice comes equipped with a 4n25 model?
Andy
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Hi,?
I started studying a project using 4n25 to control a mosfet, but I was suggested to use the fda217, does anyone have a model of it that they can share?
regards
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Re: Help converting UCC5304 simplis model into LTSPICE
On Sun, May 19, 2024 at 03:35 AM, Frank Muenchow wrote:
Thanks eetech00 for porting the model. Unfortunately there's a serious bug, it never works with common mode voltage. I tried a correction
/g/LTspice/files/UCC5304_model_test.zip
Good catch Frank.. I changed the A device "0" reference manually on the outputs but forgot about the inputs.??? :-| I will update the model, noting your revision, and upload in a day or two. eT
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Re: Help converting UCC5304 simplis model into LTSPICE
" /g/LTspice/files/UCC5304_model_test.zip" Files should be uploaded into the Temp folder only. Andy
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Re: Import LTspice simbol model of UCC5304 problem
Frank,
Thanks, I suspected there was something going wrong in that UCC5304 model, but had not gotten to that point yet.? Thanks for finding this problem with it.
If I remember correctly, this was not a published model, it was converted from another program to SPICE.
Andy
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Re: Help converting UCC5304 simplis model into LTSPICE
Thanks eetech00 for porting the model. Unfortunately there's a serious bug, it never works with common mode voltage. I tried a correction
/g/LTspice/files/UCC5304_model_test.zip
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Re: Import LTspice simbol model of UCC5304 problem
Here's the link /g/LTspice/files/UCC5304_model_test.zip
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Re: Import LTspice simbol model of UCC5304 problem
Hello Andy,
you are right about errors in the posted simulation circuit, e.g. duplicated vdd net label. The issue has been also dicussed at Edaboard
There's however a serious problem with the published ucc5304 model. Obviously the LTspice? has never been tested with common mode voltage between input and output.? Reason is inappropriate usage of global ground node "0" in the subcircuit. I made a little testbench showing the problem and post it along with corrected ucc5304 model.
?
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Do you realize that by putting a single polarity voltage pulse across the inductor the power delivered from that source is ~0.8Watts?
This will heat up the IC and diode. Also, the common-mode voltage on the input is specified as -0.2V max. and the 1N4007 will let it
go way beyond that.
BTW, the circuit works fine as is, including UIC, when the alternate solver is used.
-marcel
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Several points:
- ?The .ASY and .MOD need to be in the same
folder as the .ASC, not a separate one.
- It works if you delete UIC. Don't use UIC
unless it's essential.
- You set Trise and Tfall to 0, which is
impossible. LTspice uses default values, which may not be
suitable. I set them to 0.1?, but they could be bigger if you
adjust Ton and Tperiod to allow for them.
On 2024-05-19 06:51, gho via groups.io
wrote:
I'm only using LTSpice at hobby level. I've created a component
for bi-di current-sense amplifier INA181 from PSpice model
supplied by TI and a little test schematic (/g/LTspice/files/Temp/ina181a1-test.zip).
But using an inductor as load simulation stops with "Singular
matrix" error. And with a resistor it gets very slow after a
while and output looks not as expected. Maybe someone can make
this work better.
--
OOO - Own Opinions Only
Best wishes
John Woodgate, Rayleigh, Essex
UK
Keep trying
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I'm only using LTSpice at hobby level. I've created a component for bi-di current-sense amplifier INA181 from PSpice model supplied by TI and a little test schematic (/g/LTspice/files/Temp/ina181a1-test.zip). But using an inductor as load simulation stops with "Singular matrix" error. And with a resistor it gets very slow after a while and output looks not as expected. Maybe someone can make this work better.
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Do you mean the effect of tolerances on
component values? It doesn't have anything built-in to do that,
but there are several ways to do it, ranging from a simple. STEP
to nested .STEP, and some other ways. Please read the Help,
several times. The information content is very dense.
On 2024-05-18 14:49, cander shelter via
groups.io wrote:
do LTspice have .Sens analysis (can perform the sensitivity
analysis)?
--
OOO - Own Opinions Only
Best wishes
John Woodgate, Rayleigh, Essex
UK
Keep trying
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do LTspice have .Sens analysis (can perform the sensitivity analysis)?
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Re: Import LTspice simbol model of UCC5304 problem
john23 wrote, "I read that i should use 100Mega Ohm resitor to solve my ltspice problem."
Where did you read that?
Do you think that the advice came from a reliable source?? Exactly what problem was the 100 Megohm resistor supposed to solve?
The circuit you uploaded in UCC5304_Simplis_Test2.asc has a mistake.? There are two voltage sources driving the net VDD.? V2 on the left drives VDD, and V4 in the upper right corner also drives VDD.? They should not be the same net.? Also, the 1 uF capacitor (C2) at the output of the UCC5304 taxes its ability to switch.
What have you done to diagnose your circuit?
Andy
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Re: Import LTspice simbol model of UCC5304 problem
UPDATE:
I read that i should use 100Mega Ohm resitor to solve my ltspice problem.
i did referenced the Vdd as you said.
Is it possible? to make the circuit at #153738 work in LTSPICE so the output will follow that input and not just charge and stay constant?
Thanks.
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John Woodgate