• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 62 subscribers
  • Views 71 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

LM5180: PSR Flyback Modes of Operation confirmation

Allen Lu
Intellectual 1990 points
Part Number: LM5180

Tool/software:

Hi Team,

 My customer target to use LM5180 for PSR ISO module, we are wondering why the modes of Operation will show as below logic?

 Just like , why using BCM in heavy load and why not DCM working at heavy load?

 would you help to share the reason and how s the benefit here? tks for the checking here.

  

  • 0
    TI__Guru 74410 points

    Hi Allen,

    Thank you for posting.  It can be understood this way:

    • The IC operate in BCM which is equivalent to quasi resonant flyback for better EMI and efficiency.
    • At light load it runs in DCM to limit the switching frequency and hence the switching losses.
    • At very light load it runs inf FFM to further reduce the switching losses and hence maintain efficiency from being drops low.

    Hope this clarifies.

    Best Regards,

    Youhao