TPS54620 Buck converter compensation

Hi Stefan,

This is a good question and I apologize for the delay in response. I recommend putting the part number in the post title as this usually catches our attention more quickly.

For compensating with a more complicated output filter, I recommend simulating the loop using the PSPICE average model in the models section on the product web page. Here's the link: http://www.ti.com/lit/zip/slvm697

Best Regards,
Anthony

This was a difficult one for me to solve, have been working with the software but now there is no escapes… If someone can help me this problem I would be willing to pay for your time.

Regards

Stefan

The procedure for designing compensation based on pspice modeling is relatively straightforward.  You can easily look at the closed loop, compensated error amplifier and powerstage gain and phase independently.  Then you can pick the pole and zero location to get teh reponse you desire.  If you have any questions about it please post them.

Thanks for your support but I have struggle with PSPICE for days and I still don’t know how to set up the filter. And if I did I wouldn’t be sure that my solution is as good as it could be. So I would prefer to hiring an expert to help me :)

Tell me about your application.  What is you production schedule and anticipated volumes? 

The article is basically a dual independent USB charger with TPS2511-Q1 and TPS54260-Q1. It includes input and output filters, logarithmic amplifier to sample conducted emissions, uC to monitor system and change TPS2511 hiccup mode behavior. 10 PCB are made and used for lab and initial testing. The first series production will be 1000 units, starts after certification testing is performed in June.

Regards

Stefan