Hi guys, I have a unencrypted lib file from a DCDC controller LM25037 (direct link: http://www.ti.com/lit/zip/snvmbl4). I tried using the lib file to create a symbol and to use the model (create symbol in the lib file). The first problem was that there was no GND connector defined. But OK. After that, I tried to create a small circuit. Unfortunately it seems not to work. I receive messages, like
Questionable use of curly braces in "b§e_abmgate yint 0 v = {if (v (i0)> {{vthresh}}, {{vss}}, {{vdd}})}"
Error: undefined symbol in: "if ([v] (i0)> ((vthresh)), ((vss)), ((vdd)))"
Does anyone know what it is? Can anyone help to create a working model for LTspice?

Thanks

 

Hi

Try the attached. Let us know if it works.

eT

 

Hi,
thank you for your help. Unfortunately, it doesn't work. There seems to be the same error. For the first simulation I have a circuit from http://www.ti.com/lit/an/snva606/snva606.pdf (page 7). See attachement.

But the problem is the error: "Unknown subcircuit called in ..." at the start of the simulation.

Any other ideas?

 

Hi

Add this statement to the schematic:

.lib LM25037_TRANS_LT.LIB

eT

 

Hello eT and All,
Been a while and bumping this thread. I am trying to use this model and I get the error = "u1:v_irt1: requires a minimum of 5 parameters. Only 2 specified."
I am new to custom LTSpice models and after poking around, cannot find where to enter these parameters.
Thanks in Advance,
-Andrew

 

Hello eT and All,
Been a while and bumping this thread. I am trying to use this model and I get the error = "u1:v_irt1: requires a minimum of 5 parameters. Only 2 specified."
I am new to custom LTSpice models and after poking around, cannot find where to enter these parameters.
Thanks in Advance,
-Andrew

In LTspice IV, it was possible to specify a voltage source with fewer than the maximum number of parameters. In LTspice XVII that changed and all voltage sources that specify the PULSE format require 5 parameters. Where you put them is on the line that defines "v_irt1". If you know what the LTspice IV defaults for unspecified parameters that would help. @crutschow might be able to help you in that regard.

 

I've fixed the voltage source.

I didn't troubleshoot the circuit.