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UCC28220-Q1: UCC28220 slope resistor calculation for interleaved boost converter

Shashank Varshney
Prodigy 50 points
Part Number: UCC28220-Q1
Other Parts Discussed in Thread: UCC28220

Tool/software:

Hello,

Can you please suggest the method how to calculate slope resistor for UCC28220 interleaved boost converter. The method given in datasheet is also wrong. Values calculated by the formulas mentioned in the application note are wrong.

  • 0
    TI__Guru 52095 points

    Hi,

    Where do you think wrong and why?

    What is the application note you are referring to?

  • 0 in reply to Hong Huang
    Prodigy 50 points

    Hello Hong,

    Please check all the parameters calculation in the above attached image. I am getting some different value for VSL(prime) & R_slope. I am referring to the UCC28220. Link is also attached below

    Interleaved Dual PWM Controller With Programmable Max Duty Cycle datasheet (ti.com) 

  • 0 in reply to Shashank Varshney
    TI__Guru 52095 points

    Hi,

    Please provide your calculation and advise where you think wrong. 

    The datasheet on its application note was checked and reviewed and good to release. So you need to point out where you think wrong and why. After receive what you think, we can make check.

    We do not have a bandwidth to make full review but ok to check with what you think concerned.

    So what you mean is the datasheet application section not an separated application. If this is not true then please correct.

  • 0 in reply to Hong Huang
    TI__Guru 52095 points

    Hi,

    It looks you think the down slope current cannot be sensed at current sense transformer as the primary side switch is off - if you think this is wrong - then this is the way to use to estimate slope compensation, unless you can add another current sense transformer to sense the secondary side current.

    When using the current sense transformer for primary side current, -m is estimated by the same current transformer.

    This approach is used in flyback converters for decades. So it is a correct approach. If what you think wrong is not this then you need to provide your finding with reasoning.