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Hi, I need to design a buck converter using a LM27403 or LM27402. I need to implement some features not included in the 'vanilla' examples which are generated by Webench, design spreadsheet, EVMs etc. so I want to do a transient simulation in TINA. Since I was not sure which part I would use, I downloaded the unencrypted spice models for both, and captured a basic schematic for each. In summary, the LM27402 design simulates OK, but the LM27403 design gets as far as displaying the progress bar, but sticks at 0% indefinitely. I wonder if anyone can see why?
Actually, I just noticed that the simulation IS progressing, at about 1% per 30 minutes. THe LM27402 simulation reached 100% in about 5m.
Thanks
Ian
Sorry, I am having problems attaching files with Firefox. Hopefully now OK with IE.
Ian,
I have confirmed that the simulation is quite slow. I will take a closer look at the model to see what could be causing the slower response. Please note that the two models are relatively similar, however, the 403 is a much more complicated model than the 402.
Ian,
Which CSD FETs are missing TINA-TI models? Let me know as we have most, if not all, of the CSD FETs in TINA-TI. The encrypted PSpice models for the CSD FETs will not work in TINA-TI nor in LTSpice. Unfortunately, LT does not allow us to use LTSpice (due to their EULA) for TI products.
If there is another part that you are having trouble getting into TINA-TI but have a PSpice model for it, please let us know. We can normally get the model into TINA-TI if it is a PSpice compatible model. The big problem is when the model developer uses the "built in" PSpice models for logic gates. These are incompatible with ANY software tool other than PSpice.
Let me know on the CSD FETs. We can usually get them to you very quickly.
Thanks for your patience and the update.
Ian,
Yes, everything you have said about LTSpice is true. Their built in models are unique.
Please see the attached .TSM file for the CSD17578Q3A. You may place it using the Insert-->Macro feature in TINA-TI.
The best place to search for SPICE models for TI products is here:
Ian,
Sorry for the late reply. The Transient model nomenclature comes from the power products which may or may not need a transient and average (AC)model. The MOSFETs are transistor level based subcircuits and can be used in any simulation, hence the name Spice model without the transient limitation. Previously, I believe transient was required to be specified by the software loading the devices (or it was not required, one of the two), so there is some inconsistency there. I'll look into correcting it.
We do have PSpice models for most of the devices on you list, except the 17309 and the CSD17579Q5A. I am looking into why these models are not present. The rest of the models in TINA-TI as you had asked are attached below.
Please let us know if you have any further questions.