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UCC28782: Questions about ZVS

Kaji@PAN
Mastermind 7155 points
Part Number: UCC28782
Other Parts Discussed in Thread: LMG2610

Hello,

I would like to ask questions regarding UCC28782.
(Question 1)
Regarding equation 10 of datasheet 8.3.12.
You mentioned that CSW is the total capacitance of the switch nodes, but is it okay to simply add up the capacitance components (junction capacitance of switching devices, stray capacitance of bootstrap, etc.) mentioned later?
(Question 2)
Regarding equation 11 of datasheet 8.3.13.
Regarding Rcs, in my EVM verification, I am detecting the current converted from 1A to 1mA by LMG2610.
In this case, is it okay to substitute 1/1000 of the resistance value?
For EVM, 120Ω (R47)/1000 = 0.12Ω
(Question 3)
Regarding equation 47 in datasheet 9.2.2.6.
What capacity does Cdz refer to?
What value is Lsws in EVM?

Best regards,

  • +1
    TI__Mastermind 21975 points

    Hi Kaji-San,

    Thank you for the query on UCC28782.

    Please find my reply below:

    1. Yes you are correct. Please the below snippet from the excel sheet which shows provision to include these into design.

    2. Yes the scaling of 1000 needs to be accounted while using LMG2610.

    3. Lsws is taken as 4nH, Cdz is 0.

    Regards,

    Harish