I am working on a buck converter using LM5009A and LM5008A.
But the pSpice simulation model for the above ICs are not available in TI website.
Can anyone help me to get the pspice simulation library or models for LM5008A and LM5009A. I tried in the list of models and librarires available in TI website, the model/library for LM5009A and LM5008A are not available.
I will forward this to out webench guys and see if they can help.
We do not have PSpice models for the LM5008 and LM5009. But those parts are enabled in Webench with simulation support. You could run those sims in Webench.
Thaks for your suggestion. :)
Yes of course, I can use Webench, I also tried it, but It will be better to simulate in Pspice, in which we can check the input current waveform during starting and such things. The Pspice model for LM5007 is available, So Can you help me in arriving at LM5008 by modifying it?
My team as such does not have the capability to convert Pspice models. I will forward your request to the right channels to see if they have this project planned or in queue.
There is a TINA spice model of LM5009/A on the web. It has been uploaded recently. Should find link on this website.
Thanks and regards,
The TINA model can be used only in TINA not in Pspice. Right? I am looking for Pspice model for LM5009A and LM5008A
And one more clarification, in your LM5007 model test bench, the input voltage raises from zero and reaches 50 V with a delay of 100u. What if I give a DC voltage which starts from 50 V without the turn ON delay.?
I have tried the simulation with LM5008 but when the simulation had finished there is no Vout Graph. Vswitch is only a few volts. I had used standard parameters. Is the simulation for this device stable?
I apologize that the WEBENCH simulations for LM5008 and LM5009 were not working correctly. I have looked into the issue and have corrected the problem. You should be able to sim the devices without any issues.
Again, I apologize for the inconvenience and thank you for letting us know that the sims were broken.
I'm sorry that the fixes won't be avail until tomorrow when the software gets its update.
thank you for your fast response. I tried the simulation again and the Vout waveform is now available after the simulation.
I used the standard parameters 12V-95V with 10V and 0.3A (30°). I tried the "Startup Simulation" but Vout only reaches 0.25V and not 10V.
The software was just updated this morning. Attached is a sample of the working startup sim.
here is a simulation with the LM5008. The feedback resistors are 6.19k and 1k for a 18V output. In the file you can see that Vout only reaches 11V.
5756.Simulation LM5008 23-75V 18V 0.2A.pdf
Thank you. I may know why the sim output is not reaching the desired Vout. It's caused by the incorrect resistive load. I'll update the circuit calculator tomorrow.
You can see the good results if the resistive load is changed to 90 ohm for startup.
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