• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 262 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

UCC25630-1EVM-291: What are the Functions of R21 and D10?

Tim Finks60
Intellectual 300 points
Part Number: UCC25630-1EVM-291
Other Parts Discussed in Thread: UCC256304,

Why are R21 and D10 needed in this design? I see no mention of these in the UCC256304 data sheet, and WebBench doesn't include them. Do I need them?

  • 0
    TI__Mastermind 40520 points
    Hello Tim,

    Thank you for your interest in the UCC25630-1EVM-291.

    The function of R21 and D10 are explained in section 5.2 of the UCC25630x Practical Design Guide document: www.ti.com/.../slua836a.pdf
    They are an optional protection sub-circuit added if necessary to avoid optocoupler saturation.
    You may or may not need them depending on your specific feedback implementation. The Design Guide will help you determine whether they are necessary for your design.

    Regards,
    Ulrich