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TPS61165: PWM dimming issue

Part Number: TPS61165

Tool/software:

Hi Sir,

My customer used the TPS61165 for the backlight dimming application.

Only the PWM dimming duty at 100%, the dimming function is working normal.

The dimming function is working abnormal when the dimming duty at 25/50/80%, but they tried to add a damping resistor 10KOhm on the CTRL pin and the dimming function can work normal.

Could you review the schematics and waveform on the attachment, and also advise some comments? Thanks!

TPS61165 PWM Dimming issue.docx