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TPS61199 PWM Dimming Acoustic Noise

Other Parts Discussed in Thread: TPS61199

Hi Sir.

TPS61199, Why is the PWM dimming acoustic noise  when the duty 50% (PWM dimming Freq. 5~8KHz)?

The PWM dimming had acoustic noise from input cap. & boost inductor component around.  

To add input cap. or L inductance are can't solve it. So, how can it be solved?