TMS320F28035: 2p2z coefficient design guide

Brian Wang0

Expert 5120 points

Part Number: TMS320F28035

Hi team,

I am working with my customer on HVPSFB design based on HVPSFB V1.1.

However, we have difficulty in designing the coefficient of 2P2Z controller.

1. For HVPSFB in peak current mode, do you have a detailed guide of how to design fzs, fps and Kds?

2. If not, do you have any detailed guidance of how to design coefficient for a general converter?

3. In SPRABE7A, a method of designing Type II compensation in BUCK is shown. Can we follow the same procedure in a HVPSFB?

Thanks

over 5 years ago

0 Brian Wang0 over 5 years ago

TI__Expert 5120 points

Hi team,

Could anyone please give some support on this TI design?

0 Chen Jiang ti over 5 years ago in reply to Brian Wang0

TI__Genius 15555 points

Hi Weiqi,

Sorry for the late reply.

The theoretical way is to use the control coefficients in a simulation model and tune them in the experiment. What we did is to choose a group of loose coefficients such as lower Kdc and use network analyzer and oscilloscope to measure the loop response and transient performance to tune the coefficients better. Thank you.

Regards,
Chen

0 Brian Wang0 over 5 years ago in reply to Chen Jiang ti

TI__Expert 5120 points

Yes I understand.
But could you please give some details on how to model the PSFB in peak current mode?
I cannot find any detailed explanation.
Thanks

0 Chen Jiang ti over 5 years ago in reply to Brian Wang0

TI__Genius 15555 points

Hi Weiqi,

TBH, we don't have more details to provide at this point but I believe you can find more information in the acadamic literature on this topic. Thanks.

Regards,
Chen

0 Chen Jiang ti over 5 years ago in reply to Brian Wang0

TI__Genius 15555 points

Hi Weiqi,

Do you have any other questions regarding this issue? If not, please verify one of TI's responses to close the thread.
I know you are interested in getting more details on this topic, but like I mentioned those are all what we have right now. The procedure for general converters will be similar like what you find in SPRABE7A to build the control-to-output transfer function and cancel out effect by setting appropriate compensation network. However, the details can be very different.

Thank you.

Regards,
Chen

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TMS320F28035: 2p2z coefficient design guide