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LM3434 Maximum dimming ratio

[LED driving conditions] 
temperature range: -30 ~ 85 ℃ 
Input voltage range (Vin): 9V ~ 16V 
LED_Vf: 2.0 ~ 5.1V 
maximum Drive current: 1.0A (PWM drive) 
current drive for FET: by the application 
It seems that considering the negative voltage input. 
Question 
Could you tell us about these question. 
①Maximum dimming ratio when PWM drive frequency 5kHz 
②Maximum dimming ratio in the case of PWM 30kHz 
③Maximum dimming ratio of analog dimming (maximum step)