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UCC28070: Inquiry on Tools for Phase/Gain Margin Verification of UCC28070

Conor
Guru 12655 points
Part Number: UCC28070


Tool/software:

Hi,

One of our customers is currently developing a PFC circuit using the UCC28070 and has requested that we provide phase margin and gain margin information prior to hardware operation.

Could you please advise on the recommended TI tools or resources that can be used at the design stage to verify phase margin and gain margin, and the best way to approach this requirement?

Best regards,

Conor

  • 0
    TI__Genius 10370 points

    Hi Conor,

    At TI, we recommend using the Bode 100 Vector Network Analyzer. We typically tune our control loop with this product. Omicron has a good app note to get started: https://www.omicron-lab.com/applications/detail/news/dcdc-converter-stability-measurement.

    Any network analyzer should work though as long as you make the necessary circuit change to inject the signal into the feedback loop..

    Best,

    Jonathan Wong  

  • 0 in reply to Jonathan Wong
    Guru 12655 points

    Hi Jonathan,

    Thank you very much for your response and for sharing the information regarding the Bode 100 Vector Network Analyzer and stability measurement methods. We understand that this is a recommended approach for evaluating the control loop on hardware.

    However, our customer’s request is specifically focused on the design stage prior to hardware evaluation. They would like to know if there are any calculation-based tools (such as Excel) provided by TI that can help estimate or verify the expected phase margin and gain margin before building the prototype.

    Could you kindly clarify if TI has any such design resources available for the UCC28070, or provide guidance on how to best address this requirement during the design phase?

    Thanks,

    Conor

  • 0 in reply to Conor
    TI__Genius 10370 points

    Hello Conor,

    I would use the UCC28070 Excel calculator to find component values for your system requirements: https://www.ti.com/tool/download/SLUC114

    With PFC controllers, you typically do not want to have a fast control loop since you want the to track the low frequency AC line (50Hz - 60Hz). If the control loop is too fast, then you will have low PF.

    Regards,

    Jonathan Wong