C2000WARE-DIGITALPOWER-SDK: How to calculate A2 in 3P3Z in Digital Control Library

Julia Li

Expert 3550 points

Part Number: C2000WARE-DIGITALPOWER-SDK
Other Parts Discussed in Thread: C2000WARE

Tool/software:

Hi Champs,

My customer found a <Designing Stable Digital Power Supplies> pdf file online. I also insert this file below.

8272.Presentation_-_Mr._Ali_Shirsavar.pdf

Regarding the discretization of 3P3Z (bilinear transform, Tustin), it was found that the calculation of A2 in the document was not the same as in other literatures referred to by the customer.

I also found no specific information about the discretization of 3P3Z

So customer want to check:
1. Which formula is used for the A2 coefficient in TI's C2000Ware_DigitalPower(https://www.ti.com.cn/cn/lit/ug/spruid3/spruid3.pdf)? Left or right?
2. Is there any documentation about this?

Thanks!

Julia

20 days ago

0 Sira Rao80 15 days ago

TI__Mastermind 23720 points

Julia,

Apologies for the delayed reply.

https://api.eestar.com/article/share/2020/11/55fe6202011021151243275.pdf

It seems like the above is another resource that matches well with the "Other" from your picture.

Please note that the one you have marked as "TI" is the one from Biricha and possibly there was a typo in their A2 coeff.

In spruid3, we don't discuss which formula was used - this is more a library implementation of various controllers, and the coefficients are supplied by user code.

Thanks,

Sira

C2000™︎ microcontrollers

C2000 microcontrollers forum

C2000WARE-DIGITALPOWER-SDK: How to calculate A2 in 3P3Z in Digital Control Library