• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 64 subscribers
  • Views 539 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.

Efficiency variation of UCC28180

Takahiro Nishizawa
Genius 5575 points
Other Parts Discussed in Thread: UCC28180, UCC28019, UCC28019A

I have a question about UCC28180.

Our customers are concerned about frequency variation(pulse-skip) at  light load.

Our customers used UCC28019 and referred the attached document to reduce influence of frequency variation(pulse-skip).

Our customer said that they could reduce the influence of frequency variation(pulse-skip) .

Question.

If we want to reduce the influence of frequency variation(pulse-skip) of UCC28180,

can we do the same method of attached document about UCC28019?

Best Regards,

Optimizing the UCC28019A to Avoid Audible Noise.pdf

  • 0
    TI__Mastermind 31580 points
    Hi Takahiro-san,

    I have asked one of our applications engineers to review this question. You should see an answer later today.

    Regards

    Peter
  • 0 in reply to Peter Meaney
    TI__Mastermind 25570 points

    Hello Takahiro-san

    Yes, you can use a similar method on the UCC28180 - this is described in the article at www.ti.com/.../slua309c.pdf  .

    One of the main differences between  the two parts is that the UCC28019A is a trailing edge modulated PFC controller - it varies the trailing edge of the PFC gate signal to provide PWM and it requires a connection to allow it to sense the line voltage. The UCC28180 is a leading edge modulated PFC controller - it varies the leading edge of the PFC gate signal to provide PWM. The advantage of a leading edge modulated controller is that you don't need to provide a line sensing connection. This simplifies PCB layout because you don't have to provide the creepage and clearance distances associated with a high voltage. The article at the link above explains how an offset may be applied to the current amplifier input signal to avoid audible noise at light loads.

    Please let me know if you need any further information.

    Regards
    Colin