LM5575: LM5575 Simulation by PSPICE

Farzaneh,

Please attach your simulation file and we'll take a look. Thanks!

-Sam

Sure. here you have all the files

Thanks

FarzanehLM5575.rar

Farzaneh,

Can you include the .lib file for the LM5575 in the simulation? I'm not seeing it in the attachment.

-Sam

Hello Sam,

Here you are.

Farzaneh4452.LM5575.rar

Hello Sam,

I changed all that u suggested, when I changed the GND to SGND for 24V, I have the error of floating components, for all of the components, when I changed all to GND, the simulation takes too long and does't work. I changed the simulation time to 5ms. I've added the LM5575.lib to sim. still doesn't work. May I ask you to send me the file that is working?

Regards 

Farzaneh

Hello Sam,

Thanks for sending me the file. I run the attached file without any changes. After 2 hours the simulation is in 19% and doesn't finish. this is the only thing that I can see.

I don't really know what is the problem. do you have any suggestion?

Best Regards

Farzaneh

Farzaheh,

Let me check with our dedicated spice team. It definitely shouldn't take that long to do so little. I should have some answers in a day or two.

-Sam

Hello Sam,

I continue doing the simulation with BOM properties of TI. But still it doesn't work. I'm running out of the time. any news from your part?

Regards

Farzaneh

Farzaneh,

I've reached out to the spice team again. I understand the urgency so I will continue to push for a response.

-Sam

Hello Sam,

I tried once more and this time I let the simulation finish. this is my circuit:

After 4 hours this is the result:

a zoom via of above:

I've set the simulation for 5ms. I don't know How I have the simulation for 1s. that's really strange. 

Regards

Farzaneh

Hello Sam,

I tried with the LM5575 calculator values, with a L =27u and then 37u. it doesn't work. I revised all the values with webench and calculator, I checked everything and still nothing happens.

Regards

Farzaneh

Farzaneh,

What do you mean by "it doesn't work" and "nothing happens"? Does it no longer simulate?

-Sam

Hello Sam,

I meant the simulation takes too long and I didn't see the 3.3V at the output. I still need help. I appreciate it if somebody can help me.

Regards

Farzaneh

Farzaneh,

I'm sorry for the delay. I'm still working with the spice team to try to figure out this issue.

Can you please share some information with us:

Software:

Software version number:

Your computer model:

-Sam

Hello Sam,

I saw your message some minutes ago, I'm so sorry for the delay. still we have the problem for simulating.

What you ask me:

Software: ORCAD CAPTURE

Version:16.6

Computer Model: 

Regards

Farzaneh

Farzaneh,

I'm sorry for my delay as well. I'm having issues with the software on my computer so I'm getting some help from coworkers. I'll spend some time on this tomorrow morning and I'll get back to you then.

-Sam