LM3410 dimming ratio

I got the question about the dimming ratio from the customer. They want to use LM3410 with 9bit dimming ratio (512:1).

I think can use it by low frequency of PWM (VDIM, less than 200Hz). Can LM3410 use in the dimming ratio(512:1)?

If the customer can use it, how is the PWM frequency set? If they cannot use it, how much can LM3410 set the maximum dimming ratio?

Best regards,

Atsushi Yamauchi