Re: models, subckts, netlists

开云体育

The boook is available in english too.
Check the order form

There is a box for english language

Le 03/01/2014 04:51, mskl99@... a écrit?:

?

Can someone direct me to a manual or book describing how to add custom models and subckts and how to use netlists, etc.? I am a complete nonprofessional.
I have spent hours and hours trying to find a resource that starts at the beginning and describes the principles and practice of this.? I have been completely unsuccessful.? Amazon.com has a book, but unfortunately it is only available in German. I thought maybe Helmut had written it, but alas, no.? There is also a Russian book on LT Spice, but my Russian is no better than my German.
Thanks,
Mike

models, subckts, netlists

#68967

Can someone direct me to a manual or book describing how to add custom models and subckts and how to use netlists, etc.? I am a complete nonprofessional.
I have spent hours and hours trying to find a resource that starts at the beginning and describes the principles and practice of this.? I have been completely unsuccessful.? Amazon.com has a book, but unfortunately it is only available in German. I thought maybe Helmut had written it, but alas, no.? There is also a Russian book on LT Spice, but my Russian is no better than my German.
Thanks,
Mike

Re: Link to external html files?

#68966

If I can summarize.....

I think what is being requested here, is a way to embed Internet links
(URL) in a schematic, and then have LTspice respond appropriately when
someone clicks their mouse on one of those links.  It would respond by
passing the URL to the user's web browser, and the web browser would
display the page for that URL; just as it would do if someone had
clicked on the link in a web browser window.
.
I think that is the heart of it.

If the URL points to an LTspice schematic, then perhaps it would open
directly in another LTspice window-pane, without going to the web
browser.

Regards,
Andy

Re: Link to external html files?

#68965

开云体育

Could you translate all of your questions in correct english? (from the 1st to the end) ?

If you can’t, please could you write some simple but clear examples?

E.g. : I have tried that : ... and? ...

What are you meaning by a subject like “Link to external html files?” ?

Happy New Year

Re: Link to external html files?

timathis

#68964

Just found this in help files.
****
If the http- transferred url is a .pdf file, the simulation will abort after the download. For example the following deck will download this manual as a .pdf file:

* Dummy simulation to download the help file.

* The simulation will abort with an error, but

* you'll be left with the file scad3.pdf in the

* same directory containing the netlist.

.inc 

.end

**

Another option would be the ability to add the tutorial information as help file (compiled Help file?).

There is also a  .ferret command

****.FERRET -- Download a File Given the URL

This command allows you to download files in batch mode by specifying the urls. This is handy when you don't want to have to point your browser at every file. The downloaded file will be in the same directory as the source schematic or netlist. This command has no effect on the simulation.

* example deck

.ferret 

.end
**

Tim

Show quoted text

--- In LTspice@..., "timathis" <timathis@...> wrote:

--- In LTspice@..., "timathis" <timathis@> wrote:

Is there any facility to have a user click on an external page link from within ltc.

Could this be added if not?

As an educator I visualize using ltc spice to provide tutorials using html turorial pages on basic electronic circuits.

Have searched for "html" and "html display" but did not find anything in the first several pages of search results.

I think it would be a very valuable feature if it could be implement without too much effort.

Tim
Just asking for a button that calls the users default webbrowser(and provide a url to the browser?? (chrome,IE,FF) or whatever.  The user's default browser would open the page.
I realize the user could just open the window on their own and enter the url but were talking students here!!.

Tim

Re: NCP1117 Model will not work

#68963

Hello,

I remember that all the regulators supply about 5mA from the Adjust-pin, but it should be only 50uA for teh adjustable version.

I have uploaded an example which buffer the resistive divider with an E-source. The question will be how valid is the model with this modification.

Files > Temp >
http://groups.yahoo.com/neo/groups/LTspice/files/%20Temp/

Best regards,

Helmut

Re: Error in Half-bridge simulation

#68962

开云体育

It could also be Trr of the fly back diodes,
(body diodes of the fets)
If inductive current is flowing in them.
If so, use schottkys to reduce it.

Al D.

On 01/02/2014 05:11 PM, Andy wrote:

In this circuit, it's not the gate capacitance or gate charge that causes the current spikes. ?There is little or no overlap in the gate drive signals at the gates themselves. ?You can force them to not overlap even more, and it doesn't eliminate the current spike.

The current spike happens because of drain-to-source capacitance. ?The FET being turned on, needs to discharge the combined capacitance of the two FET pins connected to the load.

You could estimate the magnitude of the current spike if you know how large Cds is and how quickly the FETs turn on.

-- 

AC2CL 

I do not think there is any thrill that 
can go through the human heart like that felt by the inventor as 
he sees some creation of the brain unfolding to success... 
Such emotions make a man forget food, sleep, friends, love, everything. 

- Nikola Tesla

Re: NCP1117 Model will not work

#68961

Sorry..that's not a problem.

I meant the Adj pin current problem.

Datasheet:

For (Vin = 11.25 V, Iout = 800ma)??? ?Iadj = 52uA typical

But I'm seeing Iadj = 17.7 mA

Re: NCP1117 Model will not work

#68960

hitec92407 wrote:

"I'm having the same issue with the NCP1117_adj1-x model..."

Which problem was that? ?There was more than one problem in this thread.

If the error message was "Unknown sub circuit called in xu1 ...", the problem is simple; the subcircuit you called is named differently than the model. ?Change the names so they match.

If that's not the problem, please elaborate.

Andy

Re: Error in Half-bridge simulation

#68959

In this circuit, it's not the gate capacitance or gate charge that causes the current spikes. ?There is little or no overlap in the gate drive signals at the gates themselves. ?You can force them to not overlap even more, and it doesn't eliminate the current spike.

The current spike happens because of drain-to-source capacitance. ?The FET being turned on, needs to discharge the combined capacitance of the two FET pins connected to the load.

You could estimate the magnitude of the current spike if you know how large Cds is and how quickly the FETs turn on.

Andy

Re: Link to external html files?

timathis

#68958

--- In LTspice@..., "timathis" <timathis@...> wrote:

Is there any facility to have a user click on an external page link from within ltc.

Could this be added if not?

As an educator I visualize using ltc spice to provide tutorials using html turorial pages on basic electronic circuits.

Have searched for "html" and "html display" but did not find anything in the first several pages of search results.

I think it would be a very valuable feature if it could be implement without too much effort.

Tim
Just asking for a button that calls the users default webbrowser(and provide a url to the browser?? (chrome,IE,FF) or whatever.  The user's default browser would open the page.
I realize the user could just open the window on their own and enter the url but were talking students here!!.

Tim

Re: Error in Half-bridge simulation

#68957

Rick,
Is there any relation between Qgate and drain to source current?
Why by changing the model of the mosfet the drain-source current has changed? which parameter of mosfet cause this changing?

Hamed

Re: Error in Half-bridge simulation

#68956

Hamed,

Rds is the resistance from drain to source, when the FET is on.? It is not?very important in this application.? Qgate is the?charge in the gate and that is the main factor in switching delays.

Rick?

Re: NCP1117 Model will not work

#68955

Hi

I'm having the same issue with the NCP1117_adj1-x model...

After reviewing the previous messages in this?thread, the resolution is not clear. :-(

Can anyone help?

Re: Error in Half-bridge simulation

#68954

Rick,
I test the gate current and the current between two mosfets in two situation

1- with BSC42DN25NS3 mosfet (Rds=425 mohm , Qgate=3nC)
Gate current =100mA
Drain-Source current =1.1 Ampere

2- with BSC600N25NS3 mosfet (Rds=60 m-ohm , Qgate=21nC)
Gate current =300mA
Drain-Source current =7 Ampere
I wonder about Drain-source current . I expected higher current in higher resistance of mosfet's drain-source.
But as you see , it is inverse. Can you tell me about it?
? The current of the mosfet gates would be going as expected. By higher value of gate capacitance , the gate current goes higher.

How we can get to these values via calculation?

Regards.

Hamed

Re: Link to external html files?

#68953

I don't see it that way, at all. If you could specify a URL to a LTspice project file instead of a file path, then students could load it via the URL and run it on their machine. Think "poor man's" (or "poor school's") cloud.

Jim Wagner

Show quoted text

From: "Andy"
To: LTspice@...
Sent: Thursday, January 2, 2014 11:32:16 AM
Subject: Re: [LTspice] Link to external html files?

I think what you are asking, is for LTspice to include a fully functional web browser.

In my opinion, that is neither practical, nor appropriate.

BTW, LTspice does have the capability to input (i.e., .include or .lib) a file "out there" on the web, but this isn't what you asked about.

Andy

Re: Link to external html files?

cbayona

#68952

LTspice would not need to handle it, it just passes the URL to the default browser to handle, it not a very difficult thing to program a lot of software have that feature.

Show quoted text

At 01:32 PM 1/2/2014, you wrote:

I think what you are asking, is for LTspice to include a fully functional web browser.

In my opinion, that is neither practical, nor appropriate.

BTW, LTspice does have the capability to input (i.e., .include or .lib) a file "out there" on the web, but this isn't what you asked about.

Andy

-- 
Cecil - k5nwa
<   > <   >

Never take life seriously. Nobody gets out alive anyway.

Re: Link to external html files?

cbayona

#68951

That sounds like a useful feature that I would not mind seeing also. Have a link in the drawing to a page that explains it or was the basis for the circuit.

If it doesn't exist an email to Mike might get that going, maybe a dot command?. His email is in the help menu, click on "about", then on the comments link.

Show quoted text

At 01:18 PM 1/2/2014, you wrote:
Is there any facility to have a user click on an external page link from within ltc.

Could this be added if not?

As an educator I visualize using ltc spice to provide tutorials using html turorial pages on basic electronic circuits.

Have searched for "html" and "html display" but did not find anything in the first several pages of search results.

I think it would be a very valuable feature if it could be implement without too much effort.

Tim

-- 
Cecil - k5nwa
<   > <   >

Never take life seriously. Nobody gets out alive anyway.

Re: Link to external html files?

#68950

I think what you are asking, is for LTspice to include a fully functional web browser.

In my opinion, that is neither practical, nor appropriate.

BTW, LTspice does have the capability to input (i.e., .include or .lib) a file "out there" on the web, but this isn't what you asked about.

Andy

Re: Link to external html files?

#68949

Write to the author, Mike Englehardt, at the address in the "About LTspice" dialog.

Jim Wagner

Oregon Research Electronics.

Show quoted text

From: "timathis"
To: LTspice@...
Sent: Thursday, January 2, 2014 11:18:43 AM
Subject: [LTspice] Link to external html files?

Is there any facility to have a user click on an external page link from within ltc.

Could this be added if not?

As an educator I visualize using ltc spice to provide tutorials using html turorial pages on basic electronic circuits.

Have searched for "html" and "html display" but did not find anything in the first several pages of search results.

I think it would be a very valuable feature if it could be implement without too much effort.

Tim