Do you have spec about minimum duty of dimming at 30KHz or minimum on pluse timing?
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The minimum on time is 6us. You can find this spec ti(sink) on page 5 of the datasheet. So the minimum duty of the 30kHz dimming frequency is 6us*30kHz=18%. Below the 18% duty cycle, the linearity is not good. But the LED still can be turned on. Please refer to Figure 9 on page 8.