pSpice simulation models for LM5009A and LM5008A

I will forward this to out webench guys and see if they can help.

Frank D

Hello Balaji,

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.

Regards,
Akshay 

Hi Akshay

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?

Regards

Balaji S

Hello Balaji,

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.

Regards,
Akshay 

There is a TINA spice model of LM5009/A on the web. It has been uploaded recently. Should find link on this website.

http://www.ti.com/product/LM5009A

Thanks and regards,

Vijay 

Hi Vijay

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.?

Regards

Balaji

Hello,

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?

Best regards

Frieder

Hello Frieder,

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.

Hello Frieder,

I'm sorry that the fixes won't be avail until tomorrow when the software gets its update.  

Hello Howard,

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.

Regards,

Frieder

Hello Frieder,

The software was just updated this morning. Attached is a sample of the working startup sim.

1778.LM5008 Sim.pdf

Hello Howard,

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

Hello Frieder,

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.