Application note x eDesign (Viper 26LD)

vitor1 · ‎2016-09-14

Posted on September 14, 2016 at 11:29

I have used eDesign for a buck converter design approach (see attachment). However, I noticed that the suggested components value are not the same as the ones on

http://www.st.com/content/ccc/resource/technical/document/application_note/e6/81/42/cf/74/28/4f/78/DM00127577.pdf/files/DM00127577.pdf/jcr:content/translations/en.DM00127577.pdf

. What is the reason for the differences (especially at the compensation)?

Thanks in advance for your support.

vitor1 · ‎2016-09-21

Posted on September 22, 2016 at 08:45

Dear moderator,

Could you please give a support on this issue? It is quite important as I am going to a mass production soon.

Thanks for your understanding & support!

Patrizia Bellitto

Patrizia BELLITTO · ‎2016-09-22

Posted on September 22, 2016 at 09:43

Hello,

I forwarded your question to the application engineer a week ago, I'll reply as soon as he gives me some feedback.

Thanks for your interest and patience!

vitor1 · ‎2016-12-13

Posted on December 13, 2016 at 13:32

Hello Patrizia,

Have you heard back from your application engineer? I have been waiting a long time for this feedback.

Thanks for your understanding!

Patrizia BELLITTO · ‎2016-12-14

Posted on December 14, 2016 at 10:00

Hello,

sorry, you are right...Could you tell me exactly the specification of your application?

Because the application note you pointed out expects two outputs, while eDesign allows only one.

Thanks

Patrizia

vitor1 · ‎2016-12-14

Posted on December 14, 2016 at 10:21

Hi,

Yes, the one that I pointed out has 2 outputs but it should make a big difference on the design as for the 5V output a linear regulator is used. So, my understanding is that I should have a similar design (on eDesign) if I would use the same specification as STEVAL-ISA116V1 for the 16V.

I am looking forward to hearing from you.

Regards,

Patrizia BELLITTO · ‎2016-12-14

Posted on December 14, 2016 at 13:43

Hi, I verified the components suggested by the application note and there are a lot of differences between them and what suggested by eDesign. Not always there is a correspondence because application note applies to a particular situation while eDesign must provide a general optimized solution. You can try to modify your design so that it is more similar to the BOM in AN4562, in terms of inductor, output capacitor, bandwidth: however, consider that in the next days, I hope tomorrow, we are publishing a new release where the compensation net for these designs is further optimized. I'll let you know when it will be online.

Patrizia BELLITTO · ‎2016-12-19

Posted on December 19, 2016 at 16:43

Hello, just to inform you that the latest release of eDesignSuite contains an optimized compensation net for VIPer buck solutions.

Regards,

Patrizia