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backlight question about tps65217

Other Parts Discussed in Thread: TPS65217

Hi,

I have two questions about tps65217's WLED driver, as follow:

1.as is shown in the picture, is the part indisensable?

2.i have a single string at 20mA with 3 LEDs(see the picture 1),how to get the value of the R1 and R2  in picture 2?

 (picture 1)

 (picture 2)

3. I find the formula in the datasheet of tps65217 as below(page 35):

what does the 'V' mean?