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UCC28700 hissing noise

Dattathreya Ramachandra
Prodigy 100 points
Other Parts Discussed in Thread: UCC28700

i am working on UCC28700 based adapter solution for 9V/1A, moment board is powered up i am hearing hissing noise what will be problem can any one help here to solve the problem???

Regards,

Datta

  • 0
    TI__Genius 9130 points

    Hi

    Can you add more detailed information to  help us to understand the problem better?

    I.e. can you specify:

    - input voltage whne the hissing noise happens, AC or DC input?

    - load current level when the hissing happens?

    - does the hissing happen at every voltage and load, or just some?

    - does the hissing happen as input voltgae is increaseds lowly from zero?

    - are the transformer cores properly glued or clipped? could the hissing noise be coming from the transformer?

    - if you look at the output voltage, does it show any signs or oscillation or instability?

    - can you give more details of the transformer size, transformer inductance, transformer turn ratio, current sense resistor value, out capacitance value, etc?

     

    Thanks,

    Bernard