• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 62 subscribers
  • Views 217 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.

UCC28019: UCC28019 No load audio noise issue

Hsu cheng
Expert 1565 points
Part Number: UCC28019

Under the condition that the input voltage is higher than 150Vac and the load is no load, the PSU will emit an abnormal sound.

RD test report is attached,How can I modify this phenomenon?Thanks.

複本 PFC Issue_20190423.xlsx

  • 0
    TI__Mastermind 34465 points
    Hello Hsu cheng,
    Application Report SLUA688 describes a method to prevent audio noise at no load in the UCC28019
    www.ti.com/.../slua688.pdf
    Placing a resistor from VCC to ICOMP adds a small offset.
    One other thing to check :
    Do you have enough output capacitance ?
    If the output capacitance is too low then the system may be going into overvoltage protection at no load.
    This will cause the pfc to turn off and back on agian.
    Please check this.

    Regards
    John