SMPS noise sound
I used TNY280 in 12V-2.2A power supply. In light loads for example in 70mA, it makes annoying noise sound in treble range (high frequency noise sound ).
But in high load the noise sound changes from high frequency to lower freq. that is not very annoying.
How can I remove or decrease this noise? Should I change transformer construction method or feedback or ...?
With Best Regards