Dear sir,
Would you plase hlep me deal with my problem? I am going to test LM3429 dimming function, AN-1985 LM3429 Buck-Boost Evaluation Board to verify dimming function. I have been trying to give a PWM waveform from TP11 then I can hear buzz sound, no matter I adjust the frequency from 200Hz~1KHz, still can hear the noise.
Having tried to parallel more input capacitor 570uF but still Buzz.
please give some suggestion, Thanks