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LP8865U-Q1: Miscellaneous questions

Part Number: LP8865U-Q1

Hello,

My customer has a couple of questions about LP8865U-Q1 as follows.

Q1:
At Figure 8-1 of the datasheet, how can users select a proper diode? Or what specs should users care about to select a proper diode?  My customer would like to hear TI expert advices.

Q2:
My customer does not use illumination control at all. They would like just ON(100% duty) or OFF. In this case, the following usage is correct?
  -  PWM/EM pin: High at ON, Low at OFF
  -  ADIM/HD pin: Always High

Best regards,

K.Hirano