LM25118 Simulation Spice and Webench

Gabe,

The PSpice model in the product folder is encrypted and can only be used in PSpice version 15.7 or higher.

I will turn in a request to have the model translated into TINA-TI.

Britt

Hi Gabe,

Thanks for bringing this to our attention and apologies for the trouble with the simulations. The PSpice model is encrypted and will only run in PSpice 15.7 and up. What version of PSpice are you using?

For the WEBENCH simulations, I am getting timeout errors for some simulations and "Simulation Results not loading from Server" errors for other simulations. Are you seeing the same errors?

We will get this fixed soon. As Britt mentioned, we will also get this PSpice model translated into TINA-TI so that you can use it for your simulations.

Thanks, 

I too was looking for the unencrypted model to run with LTSPICE.

And now It looks like the LM25118 Model has been pulled entirely? Is it moving to an obsolete part?

Josh, The PSpice and TINA-TI models have not been "pulled". They are available in the product folder.

The WEBENCH® panel is also active for the device and new designs can be created.

I am wondering why you state that the model has been pulled entirely.

Britt

Thank you for your reply Britt,

I was looking in the Spice-Rack page not in the product folder page. Will those transient models let me add a diode bridge of Ti "Smart" diodes (also Tina transient models from their product page) to the input and run the simulation with a sine wave input to the bridge? 

Thank you for your help.

Josh

Josh,

The Spice Rack page is out of date. I do not see a reason why you could not use the TINA TI smart diode models with the LM25118. I guess it depends on what you are trying to do.

I would not use the smart diode (SM74611) model as a bridge as they are designed for photovoltaic applications.

If you are simply looking for a diode model to use for a bridge in TINA-TI, click on the Semiconductors tab and select one of the many built in diodes in TINA-TI. You can also import a specific diode model into TINA-TI using the New Macro Wizard if you have a preferred diode to use.

Britt

Hello everyone,

I was thinking to use SM74611 to build bridge rectifier and I'm reading that you wouldn.t recomended that. Can I ask what are the no-reason for that? I need a really low turn-on voltage for the diodes.

Plus, is it provided just the diode spice model?

Thanks,

Filippo

Filippo,

The smart diodes are made to address a certain need in solar cell applications. Most diode bridge applications that I am familiar with are for rectification of AC signals. I have not tried using the smart diode for this kind of application and since it was not designed to perform that function, I would be hesitant to use one.

That being said, you may try the smart diode in any application that you choose. Please be sure to read the entire datasheet to see if the diode will meet your needs.

Britt

Hi Filippo,

I have tested these in a bridge rectifier and found that they pass a large amount of AC through that capacitor in the block diagram on the datasheet. I have a few Schottky diodes in place to try and keep the reverse voltage at low frequencies from damaging the IC that I'm supplying rectified current to.  I would not recommend this for a design that requires rectification of moderate or high frequency current. 

Best solution is to get six or so and bench test it. 

Hope this helps,

Josh

Thanks Britt.

Looking at the data sheet, they should be defintley do the job. Indeed, I am going to test because I'm not sure if they actually perfrome well in a rectifier.

About the Spice could you help me more, I saw the transient model on the product page, Can I get the SPICE model for the diode from it?

Regards,

Filippo

Thank you.

I'm definitly going to test bench.