Spice models, subcircuits ?

[keen]

Hello,
Can any one tell me the easy way how to build a SPICE MODEL (subcircuit) from data sheet ???
Does exist a tool for this job ?

regards keen

 

[FvM]

PSPICE has tools to generate model parameters for certain device types, e.g. MOSFETs.

Which kind of devices do you have in mind?

 

[keen]

I have LM5576 in my mind,
I found a LM5576 Spice model on TI site but it seems it is useable only in TINA, & it is encrypted
'AEi Power IC Model Library' has this model but I can not reach it ..
So have to learn how to make it ..

 

[FvM]

Simulation support for switch mode controllers is generally limited. Available models are rather behavioral than transistor level. And it's often unclear which aspects of chip functionality are covered by a specific model.

Encripting the models my intend protection of internal chip features but also more trivial objectives like hiding the limited quality of a model.

Making a simple behavioral model that implements controller and pwm isn't too difficult.