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Re: Looking for a IDT74CBTLV3253 model.

 

Gunoi Nare wrote:

? ?"As I said before, opening this file returns the error "Multiple flag.""

You are having a bad (corrupt) download.

Perhaps you are using Firefox, and perhaps you ask Firefox to open the file in LTspice.? Don't do that.

Instead, download and SAVE the file to your disk.? After it has downloaded and saved, then go to Windows Explorer, find the file, and then open it in LTspice.

Regards,
Andy
Re: Looking for a IDT74CBTLV3253 model.

Gunoi Nare
 

As I said before, opening this file returns the error "Multiple flag."

G.


From: "basier.philippe@... [LTspice]"
To: LTspice@...
Sent: Monday, August 1, 2016 10:30 PM
Subject: [LTspice] Re: Looking for a IDT74CBTLV3253 model.

?
Hello Gunoi Nare

There are examples from Helmut with the A device counter in

?

See A-counter_test;asc

Regards
PhB


Re: LTspice IV (NOT RESPONDING)

 

Jeff wrote:

? ?"I keep getting?LTspice IV (NOT RESPONDING),"

Can you tell us a bit more, please?

Does this happen when trying to install LTspice?? Or is it already installed, and this happens when trying to run LTspice?

Does it happen after clicking the desktop icon (or Start menu choice) to start LTspice?? Or does it happen after double-clicking on a schematic file to run LTspice and open the schematic?

Or does it happen when doing a simulation (after clicking the running-man icon)?

Or does it happen when LTspice is drawing a waveform plot?

Does it always happen, or only some of the time?

Andy
Re: Need help to design a transimpedance amplifier

 

Hello,?t.obulesu:

For log amp, there is a (TI) log112 model at the file folder, you could take reference of the following:

?

It shows some .TRAN issues, if you could fix it, maybe you could feedback to the file folder.
If you need really to implement one instance, there is a technique could average the background noise "white noise".
It utilizes the op amp in voltage-follower (multiples in parallel) to averaging the noise (normally it's called "white noise"), it's not eliminated but averaged.

It might be helpful. If you finally get helped from those techniques, feedback the forum, show how it take effect, lightly or significant.
if so, everyone should appreciate you.

Good day!

Best regards.
Re: Unable to find InstName attribute in LTSpice for mac

 

Hello,

I rarely use a MAC.?
I have tried now to add <InstName> to a new symbol, but I also couldn't find a menu to do this.

I have sent an email to Mike, the author of LTspice. Let's see what he will answer.

".... how to add the? <InstName> to a symbol in the symbol editor of MAC-LTspice."

Best regards,
Helmut
Re: LTspice IV (NOT RESPONDING)

 

...some of the anti virus-ware programs can slow down win7 and windows10.

To check this you would need to uninstall your virus-ware and go offline and check LTSPICE.

Or if you don't have enough RAM ( I have 12 GB on a multi-core i7 Dell system..and still get slowdowns

on some software)....see if you have something like 4GB RAM installed and your system only sees 2 GB.

If none of this helps...and/or uninstalling your virus-ware doesn't change anything email the Microsoft

Gurus..or visit their chat boxes at:?



W. Warren

?
Re: Mechanical switch

 

Hello David,

You could make a bouncing switch with a V-source (PWL) as the control voltage for a switch SW.

You can see a "typical" bouncing switch on the top-left picture.
?

Best regards,
Helmut
Re: Need help to design a transimpedance amplifier

 

¿ªÔÆÌåÓý

You have an impossible set of criteria for a linear TIA. You ask for 100mV per 100nA. 100uA is 1000 times larger than 100na. So, your spec would have 1000 times 100mV out with 100uA in, or 100V. You obviously cannot get that with a 5V only system! Your choices are to reduce sensitivity or use a logarithmic TIA circuit.

Jim

James Wagner
Oregon Research Electronics



On Aug 1, 2016, at 8:47 PM, t.obulesu@... [LTspice] <LTspice@...> wrote:

Hello ?guys..?

I want to design a trans-impedance amplifier to detect currents of the APD (in the range of 200 nA to 100 micro A).?

Could some one suggest me the best IC with less bias current, single supply (+5 V only) and how to design a high sensitive TIA..? (typically, for every 100 nA change in the current, 100 mV voltage should be displayed).
Re: Input impedance of an energy saving fluorescent lamp (CFL) 21W

 


CFL Circuit
13 Watt 120 VAC Compact Fluorescent

Bordodynov.

02.08.2016, 19:04, "Jerry Lee Marcel jerryleemarcel@... [LTspice]" <ltspice@...>:

CFL's are very non-linear, in fact exhibit negative resistance. There are a few Spice models on the internet, you may have to adapt them for LTspice.

Le 02/08/2016 ¨¤ 17:42, michael883575@... [LTspice] a ¨¦crit?:

I am attempting to simulate a loaded inverter using the equivalent input impedance of the CF lamp as the load. Is there anybody in the group who might have an idea as to what a typical value for example for a 21W lamp might be.

Thank you very much in advance

Michael
----------------------------------------

L'absence de virus dans ce courrier ¨¦lectronique a ¨¦t¨¦ v¨¦rifi¨¦e par le logiciel antivirus Avast.
www.avast.com
Re: Input impedance of an energy saving fluorescent lamp (CFL) 21W

 

¿ªÔÆÌåÓý

CFL's are very non-linear, in fact exhibit negative resistance. There are a few Spice models on the internet, you may have to adapt them for LTspice.


Le 02/08/2016 ¨¤ 17:42, michael883575@... [LTspice] a ¨¦crit?:
?

I am attempting to simulate a loaded inverter using the equivalent input impedance of the CF lamp as the load. Is there anybody in the group who might have an idea as to what a typical value for example for a 21W lamp might be.


Thank you very much in advance


Michael?



L'absence de virus dans ce courrier ¨¦lectronique a ¨¦t¨¦ v¨¦rifi¨¦e par le logiciel antivirus Avast.


Re: LTspice IV (NOT RESPONDING)

John Woodgate
 

¿ªÔÆÌåÓý

It's because your computer is being slowed down. Maybe you need to run a tune-up application. Just emptying some files, like Temp and Recycle Bin might help. Defrag the hard drive, too, if you can leave the computer on for a long time while not in use.

?

With best wishes DESIGN IT IN! OOO ¨C Own Opinions Only

J M Woodgate and Associates Rayleigh England

?

Sylvae in aeternum manent.

?

From: LTspice@... [mailto:LTspice@...]
Sent: Tuesday, August 2, 2016 4:33 PM
To: LTspice@...
Subject: [LTspice] LTspice IV (NOT RESPONDING)

?

?

I keep getting?LTspice IV (NOT RESPONDING), My thinking is that LTspice is busy loading the info it wants or my computer is busy, but it only happens with LTspice,?

Computer is Toshiba Laptop running Window 7 (I don't like 10) any ideas or do I just need to be more patient? It does finally respond and do what I asked for.

?Thanks,

Jeff

?
Mechanical switch

 


Where could I find a model of a real mechanical switch, including sparking during opening?
I'm interested in spark gaps in general, but particularly a switch (voltage controlled ideally) that behaves like a real switch WRT arcing when used with inductive loads.

I am only partially "on" the list here, my access does not include file downloads or web access to the group.

--
K1FZY (WA4TPW) SK? 9/29/37-4/13/15
Input impedance of an energy saving fluorescent lamp (CFL) 21W

 

I am attempting to simulate a loaded inverter using the equivalent input impedance of the CF lamp as the load. Is there anybody in the group who might have an idea as to what a typical value for example for a 21W lamp might be.


Thank you very much in advance


Michael?
LTspice IV (NOT RESPONDING)

 

I keep getting?LTspice IV (NOT RESPONDING), My thinking is that LTspice is busy loading the info it wants or my computer is busy, but it only happens with LTspice,?

Computer is Toshiba Laptop running Window 7 (I don't like 10) any ideas or do I just need to be more patient? It does finally respond and do what I asked for.

?Thanks,

Jeff
Unable to find InstName attribute in LTSpice for mac

 

I'm trying to create a symbol in LTSpice for mac.
I've to place the InstName attribute but I'm doing right click -> view -> Attribute table and it's not there
Re: libraries for electronic components

 

.ummm, the best suggestions starting out is to Google the data sheets and see if those devices

match up any of the circuits that have already been modeled around here.

Have you designed and run a MOSFET simulation with LTSPICE yet?

Might be a good place to start.

Here are some useful URLs:



?? <---MOSFET docs

? <---LTSPICE tutorial

?? <---MOSFET modeling

? <---paper

?? <---youtube instructional video


W. Warren
Re: Modelling an optoisolator

[email protected]
 

Helmut,

Never mind! I found the problem. You had a comma in your table instead of a period (4,9 instead of 4.9). It works now.
Re: Modelling an optoisolator

[email protected]
 

Helmut,

I tried your suggestion of using an arbitrary behavioral voltage source (Bv) with the table you proposed (V=table(I(D1), 0,0, 1m,1, 10m,4.9, 100m, 4.95), and I got the following error:?
<<<>>>
B1: The table function requires the ordinate followed by pairs of table points, i.e., it requires the total number of arguments to be odd.
<<<>>>
Here's a link to a screenshot of the LTSpice model I built:?
Her's a link to the actual model:?

Skip
?
Re: Modelling an optoisolator

 

Hello,

May I ask a question ? If represent the transfer function in math equation, what would be the variables which is depended to vary the output ?
It seems the variable is Iin, but how to represent it in math equation ,do that belong to physical domain ?

Is it possible to use the BV or BI with those equations to represent the actual behavior if once someone have got the math equation ?

Thanks
Best regards.

---In LTspice@..., <skip@...> wrote :

I have a requirement to model an optoisolator in LTSpice. The optoisolator has an input LED that shines light on a photovoltaic cell on the output. Current in the LED will cause light to fall on the photovoltaic cell and cause a voltage to be generated on the output. I have measured the input-current-to-output-voltage characteristics of the device - Vout=F(Iin). The transfer function F is somewhat nonlinear. I have created a table of measurements listing the output voltage for a set of specific input currents. Now I am trying to build an LTSpice model that functions similarly to the actual device.?


A simple first-order approximation of the device would be a current-controlled voltage source with the transfer function defined as a table. i have tried all kinds of ways to define the table in a LTSpice current-controlled-voltage-source, but no luck. Can anyone show me how to do this? What does the spice directive look like, and where (and how) do you put it in LTSpice?


A second-order model will need to take into account that output impedance will also affect the output voltage (at low impedances the output becomes more like ?a current source), but that is for another day.
Re: course of HOWTO build models like (sanken) STR-A6100

 

Hi, eetech00:

Thank you. That's really a good news.

I had ran the LLC topology in some simulator (NOT SPICE) for control. But it doesn't care very detail values of those hardware parameters.
So far I hope to have one certain LLC controller IC in spice simulator to do some estimation.
Your decision just help a lot for those people like me who want to evaluate those circuits.

Best regards.

---In LTspice@..., <eetech00@...> wrote :

Hi

I'm creating a UCC25600 behavorial model, just as a challenge, and have almost completed it.
I used switches for the? push pull drivers but I'd like to use mosfets.

I've tested part of it?using the TI EVM schematic. Output driver waveform is square with dead time.
But the?circuit has trouble converging.?Driver output might be too square... :-)

stay tuned...
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