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TPS61196: Audible noise issue

Miteshkumar Dalabhai Patel
Intellectual 1900 points
Part Number: TPS61196

HI..

One of my customer is working on TPS61196 based back lit driver for LED in LCD display.

For lower PWM duty cycles, driver is generating the audible noise, we tried changing the switching freq., PWM dimming frequency, compensation, inductor values, capacitor values, capacitor types etc.....

How can we eliminate audible noise?

Mitesh