LTSpice/ LM7301

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Paul Burke - 30 Nov 2007 09:29 GMT

When I try to use the model for the LM7301 in LTSpice, I get "unknown
subcircuit"- any ideas/ fixes anyone?

PB

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Brett Holden - 30 Nov 2007 18:06 GMT

Hello, Paul!
You wrote on Fri, 30 Nov 2007 09:29:16 +0000:
PB> When I try to use the model for the LM7301 in LTSpice, I get "unknown
PB> subcircuit"- any ideas/ fixes anyone?

PB> PB

Without knowing exactly how you invoked the model I can only guess, but did
you notice that the model is called ".subckt LM7301/NS"?
Either delete the "/NS" in the model file, or else you must call it as
LM7301/NS.
With best regards, Brett Holden. E-mail: bretth2o@bellsoh.net

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David Gravereaux - 01 Dec 2007 17:37 GMT

> When I try to use the model for the LM7301 in LTSpice, I get "unknown
> subcircuit"- any ideas/ fixes anyone?
>
> PB

Right click over your model for it in the schematic and select 'prefix'. Add
an X to the beginning of the name.

Now your part knows to use a subcircuit.

Also see: http://groups.yahoo.com/group/LTspice

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David Gravereaux <davygrvy@pobox.com>
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Paul Burke - 03 Dec 2007 10:17 GMT

> When I try to use the model for the LM7301 in LTSpice, I get "unknown
> subcircuit"- any ideas/ fixes anyone?

Thanks to those who replied; though the suggestions didn't solve the
problem. The actual trouble was the the file is called LM7301.mod, but
in the file the subcircuit is called LM7301/NS. Changing it to plain
LM7301 fixes it.

PB

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Helmut Sennewald - 03 Dec 2007 19:48 GMT

>> When I try to use the model for the LM7301 in LTSpice, I get "unknown
>> subcircuit"- any ideas/ fixes anyone?
[quoted text clipped - 5 lines]
>
> PB

Hello Paul,

LTspice accepts any file. Even "LM701.123" will be Ok
as long as you use the full file name either in the
symbol or in an ".include filename" in your schematic.

Best regards,
Helmut

A lot of similar examples are in the Files section
of the LTspice user group.
http://tech.groups.yahoo.com/group/LTspice/

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Paul Burke - 05 Dec 2007 08:01 GMT

> LTspice accepts any file. Even "LM701.123" will be Ok
> as long as you use the full file name either in the
> symbol or in an ".include filename" in your schematic.

I mustn't have explained that very well. The problem wasn't including
the file- it was that the name of the subcircuit inside the file was
different from the root filename. Once I edited the file to make them
the same , by changing the line

.SUBCKT LM7301/NS 3 2 4 5 6

to

.SUBCKT LM7301 3 2 4 5 6

it was OK.

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Brett Holden - 03 Dec 2007 21:18 GMT

Hello, Paul!
You wrote on Mon, 03 Dec 2007 10:17:03 +0000:

??>> When I try to use the model for the LM7301 in LTSpice, I get "unknown
??>> subcircuit"- any ideas/ fixes anyone?

PB> Thanks to those who replied; though the suggestions didn't solve the
PB> problem. The actual trouble was the the file is called LM7301.mod, but
PB> in the file the subcircuit is called LM7301/NS. Changing it to plain
PB> LM7301 fixes it.
That's what I tried to explain.

With best regards, Brett Holden. E-mail: bretth2o@bellsoh.net

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Electronics Forum / CAD / December 2007

LTSpice/ LM7301