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uc3842

[email protected]
 

Morning guys


Is there a LTSpice model for?uc3842 family. ?I have been using LTSpice to simulate LT3751 and?LT3748 simulations works 100% but when built either one on PC-board or breadboard I don't get them to work.


So I need to try something else,?uc3842 look like another option.


Virus

?
Re: regarding library file

 

Kesi Kumar wrote:

? ?"i am getting error message that could open library file of MIC4420.lib"

Did you mean that it could NOT open the library file? ?That would be an error. ?It is no error if it could open the file.

You haven't given us enough information to tell why you had the error, so I have to make a lot of guesses. ?The file is not where LTspice thinks it should be. ?You probably had a line on your schematic that was something like:

.include MIC4420.lib

or

.lib MIC4420.lib

What exactly did this line look like? ?Was the library file at the specified location? ?The error message indicates that it was not.

? ?"i had downloded lib file of?Micrel FET Driver Models, and placed at sym folder of LTspice"

That might be your mistake. ?Never put models in LTspice's folders. ?Microsoft Windows might have prevented you from putting it into the folder, by putting it instead into a virtual folder that isn't where you think it is. ?Windows does this to "protect" program files, and LTspice is in the Program Files directory tree. ?Never put your models and files there.

Put the file in your working directory where you have your schematic, which should not be under Program Files. ?Stay away from Program Files and all its subdirectories.

Regards,
Andy
regarding library file

 

when i am using MIC4420, i am getting error message that could open library file of MIC4420.lib, i had downloded lib file of?Micrel FET Driver Models, and placed at sym folder of LTspice...but stilll i m getting same error , can anyone suggest me idea that where i am doing mistake...

?
Re: Varicap MVAM108

 

There is one in the standard component menu for diodes in LTspice. I tend to use that one for applications that need something in the range of 2-10pf.

Jim Wagner
Oregon Research Electronics

On May 31, 2014, at 2:59 PM, Winfield Hill hill@... [LTspice] wrote:

?


?Jim, what do suggest using for varacters these days?
 

--
   - Win

Winfield Hill
Rowland Institute at Harvard
100 Edwin Land Blvd
Cambridge, MA  02142

617-497-4670


Re: Varicap MVAM108

 

¿ªÔÆÌåÓý


?Jim, what do suggest using for varacters these days?
 
-- 
   - Win

Winfield Hill
Rowland Institute at Harvard
100 Edwin Land Blvd
Cambridge, MA  02142

617-497-4670

Re: (unknown)

 

Kesi Kumar wrote:

? ?"i did all these...process which u said but when i m simulating then it is saying an error that unknown subcircuit about CD4013"

Then you left out something.

The subcircuit for the CD4013 is inside that .lib file. ?Open the .lib file in a text editor (like I just did) and you can find it there. ?Perhaps you forgot to include it in your schematic? ?The usual way is to add the line to your schematic:

.lib CD4000.lib

Regards,
Andy
Re: differimproved

 

? ?"Using "uic" in an amplifier having any capacitor is a very bad idea. One waste a long simulated time until the steady state operating point will be reached to the last milli-Volt."

I wholeheartedly agree!

The simulation in the original circuit ran for 10 seconds of simulated time. ?I ran it for >30 seconds, and some of the waveforms were still significantly changing even without having to zoom in to the millivolt level. ?Because the bias points were still shifting, and some of the intermediate signals are low-level, it was having a huge effect on the output.

Removing UIC fixed that.

Andy
Re: (unknown)

 

i did all these...process which u said but when i m simulating then it is saying an error that unknown subcircuit about CD4013


On Sunday, June 1, 2014 1:16 AM, "Andy Andrew.Ingraham@... [LTspice]" wrote:


?
Kesi Kumar wrote:

? ?"can anyone do a favor of help that how to get ASC file of CD4013B"

1. ?Go to the group's main webpage



2. ?Read the instructions there about finding and downloading the "Table of Contents" file.

3. ?Get that file. ?Open it in your web browser.

4. ?Search the file for "CD4000.lib". ?You will find that it is located in its own directory of Digital CD4000 family parts. ?Click on the hotlink to the file and it will take you to that directory.

5. ?Download the file "CD4000.lib". ?While you are there, also download the file "CD4000.zip", which has schematic symbols for the CD4013.

6. ?Put the files "CD4000.lib" and "CD4013B.asy" in your working directory where you plan to use it.

FYI, I have not seen an ASC file for the CD4013. ?But the .lib file (above) is a model of the CD4013, just not in schematic form.

Regards,
Andy
Re: (unknown)

 

Kesi Kumar wrote:

? ?"can anyone do a favor of help that how to get ASC file of CD4013B"

1. ?Go to the group's main webpage



2. ?Read the instructions there about finding and downloading the "Table of Contents" file.

3. ?Get that file. ?Open it in your web browser.

4. ?Search the file for "CD4000.lib". ?You will find that it is located in its own directory of Digital CD4000 family parts. ?Click on the hotlink to the file and it will take you to that directory.

5. ?Download the file "CD4000.lib". ?While you are there, also download the file "CD4000.zip", which has schematic symbols for the CD4013.

6. ?Put the files "CD4000.lib" and "CD4013B.asy" in your working directory where you plan to use it.

FYI, I have not seen an ASC file for the CD4013. ?But the .lib file (above) is a model of the CD4013, just not in schematic form.

Regards,
Andy
(No subject)

 

can anyone do a favor of help that how to get ASC file of CD4013B, actually i forget, i did previously but i m not getting...so if anybody can help me..
Re: differimproved

 

Hello,

>? Is there something wrong about SPICE's ordinary operating point analysis with respect to this amplifier?

Using "uic" in an amplifier having any capacitor is a very bad idea. One waste a long simulated time until the steady state operating point will be reached to the last milli-Volt.

Best regards,
Helmut
Re: differimproved

 

Marcel wrote:

? ?"With UIC one can provide a hint for the steady-state."

Actually, with UIC, one does not provide a hint. ?One provides the entire steady-state operating point. ?SPICE bypasses finding the operating point and takes what you give it, as the operating point.

If you use IC= or .IC without UIC, then SPICE takes what you have provided as a hint, and continues from there to converge on a steady-state solution.

I find the reason most people use the UIC, is because of not understanding what SPICE does, or because they are simulating something like an oscillator, for which careful use of UIC can be beneficial. ?Otherwise, UIC should mostly not be used, and I don't understand why so many people seem to think that adding it is a useful thing to do.

Is PSS something that really helps analyze a DC coupled audio amplifier? ?Is there something wrong about SPICE's ordinary operating point analysis with respect to this amplifier?

Regards,
Andy
Re: Li-ion BAttery models

John Woodgate
 

In message <lmcqgn+ui7i2a@...>, dated Sat, 31 May 2014,
"thutches@... [LTspice]" <LTspice@...> writes:

The only other setting that I have that could affect this is that I use
the BOLD option with Arial 10-pt font, which makes it pop a little
better..
I don't think that makes a significant difference.


So other than resetting to defaults and redrawing my schematic for
this, which is entirely tangential to the original intent of pointing
out the Saft model and how I used it?to the OP, I'm beyond being able
to spend time on it because it seems kind of open-ended as to what
satisfies others about it should look like.
I doubt that anyone expects you to, especially now I've explained how to
fix it to use a larger font size and still see everything clearly.


But I'll keep this in mind in the future
The point is that LTspice (and probably most Spices) fixes the position
of text on the schematic screen, I think, by the x-y position of the
first character. So if the font size changes from a small number to a
larger, especially to the default (which is actually the rather enormous
Tahoma 28pt Bold), the text strings run over everything in their path.

I don't think there is any better way of locating the text, short of
setting up 'exclusion areas' around the schematic elements and setting
the ends of strings to just touch the exclusion boundary. I think some
printed circuit drawing programs do this, but it's very complicated to
implement, because a string so placed might intersect another exclusion
area along its length.
--
OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk
Nondum ex silvis sumus
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
Re: Li-ion BAttery models

 

John,


The only other setting that I have that could affect this is that I use the BOLD option with Arial 10-pt font, which makes it pop a little better..


So other than resetting to defaults and redrawing my schematic for this, which is entirely tangential to the original intent of pointing out the Saft model and how I used it?to the OP, I'm beyond being able to spend time on it because it seems kind of open-ended as to what satisfies others about it should look like.


But I'll keep this in mind in the future.


Tim
Re: Li-ion BAttery models

 

I found this, but have not tried it (yet): ?

It is NOT a *SPICE model, but I plan on making one from it.

--Steven Hill
Excerpt:
"Because the charging process for?Li+?batteries can take an hour or longer, testing a?Li+?battery charger using its natural load is time consuming and frequently impractical. To speed battery-charger testing, this article presents a simple circuit for simulating the behavior of a?Li+?battery. This circuit provides an efficient means of testing?Li+?chargers without using real batteries.
"


On Sat, May 31, 2014 at 10:21 AM, John Woodgate jmw@... [LTspice] <LTspice@...> wrote:
?

In message , dated Sat, 31 May 2014,

"thutches@... [LTspice]" <LTspice@...> writes:

>
>All I uploaded a screen shot of how the circuit looks on my screen.? If
>that is what is considered clumsy, well - it is what it is.

The screenshot is OK. What is in the ZIP is an .asc schematic file, not
a screenshot. All the text areas are superimposed on the actual circuit
elements, so neither are intelligible.

>
>
>Otherwise though, I'm using Arial 10pt font.? that and some other
>setting in my options could be causing it to jumble up on other
>screens.? ???

AHA! Setting the font size to 10 instead of the default fixes the
problem. But it's then difficult to read the text. So MOVE the text
blocks away from the schematic and increase the size until it can be
read.

--
OOO - Own Opinions Only. With best wishes. See
Nondum ex silvis sumus
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
Re: Li-ion BAttery models

John Woodgate
 

In message <lmckku+11hc6fs@...>, dated Sat, 31 May 2014,
"thutches@... [LTspice]" <LTspice@...> writes:


All I uploaded a screen shot of how the circuit looks on my screen.? If
that is what is considered clumsy, well - it is what it is.
The screenshot is OK. What is in the ZIP is an .asc schematic file, not
a screenshot. All the text areas are superimposed on the actual circuit
elements, so neither are intelligible.


Otherwise though, I'm using Arial 10pt font.? that and some other
setting in my options could be causing it to jumble up on other
screens.? ???
AHA! Setting the font size to 10 instead of the default fixes the
problem. But it's then difficult to read the text. So MOVE the text
blocks away from the schematic and increase the size until it can be
read.
--
OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk
Nondum ex silvis sumus
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
Re: Varicap MVAM108

 

> abuhafss

>
>Hi
>
>I need the LTspice model for varicap diode MVAM108 or MVAM125.
>Shall appreciate if anybody can help me. >
>
>Best regards
>
>Abu-Hafss

Take a look at VVC.zip on the Device Models & Subcircuits page of my website...

?????? <>

??????????????????????????????????????? ...Jim Thompson

Jim Thompson
35129 North Laredo Drive
San Tan Valley, AZ? 85142

Voice: 480-460-2350?? Fax: 480-460-2142

Wearer of the Brass Rat - Class of 1962
Re: Li-ion BAttery models

 

Hello M. Tutches? or Tim

Yes your file Charger.jpg is very clear.

Your file .asc should be like that.

Could you make a "Reset to Default Values" in LTspice ?

I'm absolutly not an expert. And I write bad English.

Best Regards,

PhB
Re: Li-ion BAttery models

 

Phillippe, does your screen look like the screenshot I posted??


?If not, I'd like to see what the clumsy screen version of the circuit actually looks like on another screen, so please someone upload a screenshot.? Hopefully I can learn to make my circuits "not-so-clumsy", so that If I ever post something, it doesn't create total confusion and consternation.


?:-)


Thanks,


Tim
Re: Li-ion BAttery models

 

Hello M. John Woodgate

Some years ago, I saw the sale problem.

I can't remember the reason why.

Very hard to try to make this schematic clearer.

Bests Regards,

PhB
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