LM311 with LTspice

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lrjaj0000 said:
NO I dont !!
can you help me please to realize it?
I am a biggener ??
Click to expand...

OK,
Did you join the Yahoo LTspice users group.???

This image and asc file is a rough sample of what the model can do.
 

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Hi,
do you think, i could find finished components LM331.
becouse i want to realize the Circuit and the File waht you give me don t work??
Thanks
 

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Where the OPA symbol is missing from your circuit, use any of the LTS models for a single supply.

It doesn't work for you because you have a missing OPA, use any OPA

EDIT:
Have you joined the LTS Yahoo user group.???

EDIT2:
Try this version.
 

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Last edited:
Hello,
can you perhaps tell me where are the pins in your circuit 12345678???
than I can fit it on my circuit!!
Plaese
 
lrjaj0000 said:
Hello,
can you perhaps tell me where are the pins in your circuit 12345678???
than I can fit it on my circuit!!
Plaese
Click to expand...

I do not understand your question, there are no pin numbers on LTS symbols.??

Please explain.
 
lrjaj0000 said:
LM331 has 8 pin i have attached the circuit before.
Click to expand...

Its not possible directly map the actual LM331 pins to the behavioural model.

Post your LTspice circuit [ not the image of the LM331] and I will try to help.

Will you please answer my question about Have you joined the LTS Yahoo user group.???
 
lrjaj0000 said:
yes I do,
i don't have LTspice circuit because without LM331 i can begin??
Click to expand...

I have never seen a LTS model for a LM331, I have searched the web and I cannot find one.

With the circuit I posted you can make the circuit give the same output frequency for a known input voltage as the LM331.

You need to show the complete circuit you have drawn that uses a LM331 and I can make my behavioural circuit work the same....OK.?

EDIT:
I have drawn a box around the circuit and added some LM331 pin numbers, can you now follow what I am suggesting.?
 

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Last edited:
lrjaj0000 said:
hi,
at pin 6 is the voltage of the comparator and at pin1 is the current of this voltage flows generated
Click to expand...

As I have explained the circuit I posted is a 'behavioural' circuit NOT a LM331, so it will not have the pins shown for the LM331.

I have tried in a number of ways to help you solve this problem , but I cannot offer any further suggestions.

Look again at the 'behavioural' circuit that represents a LM331, you may realise that to complete your full circuit design simulation, that circuit will do the Voltage input to Frequency out operation of a LM331.
 
ericgibbs said:
OK,

I will try post a full zip, few minutes.

EDIT:
Unzip this, let me know how it goes.
Click to expand...

how bout for PSPICE model?
on the TI website I found lm311.301

what is this? the .olb file? the .lib file?
Why cant I find a .olb and a .lib file together in general? it's always just the .olb file.

Even the extra free libraries from Orcad are just the .olb files, and so it makes them useless without .lib files

this is frustrating

and what is this .asc file you included?
 
Last edited:

lm311.301 is the spice model. You'll see that if you view it with a text editor.

Forget about the .olb files...they won't work with LTSpice.

The .lib files are also spice files but contain multiple models.
You can use the .lib and lm311.301 with LTSpice...but you have to take the time to learn how to add
a new model and symbol to LTSpice.

Google "LTspice model tutorial"... you should get some hits...

eT
 
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