TPS61185: TPS61185 design query

Hi.

Here has some query about TPS61185.

The minimum duty cycle of PWM dimming can be down to 1% when the dimming frequency is less than 2 kHz. (as shwon in TPS61185 datasheet)

Due to we have an audio issue, we want to set frequency to 20kHz (or 18kHz) when dimming mode.

But the resolution will lost in dimming mode, even our device cannot back to normal brightness and need to be reset.

Please help to check is this IC limitation ? or can we modify our design to fulfill this requirement ?

Last, is there any other solution can replace ?

Thanks.

Chanah Wu