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LP8866S-Q1: Questions about LP8866S-Q1

Part Number: LP8866S-Q1

hi 

 Questions about LP8866S-Q1:

1、If we use the PWM signal output by MCU to control the dimming frequency and duty cycle of LED lights, can we simply connect the PWM signal to PIN28?
And what resistance is PIN33 (MODE) connected to ?
Meanwhile,Should PIN31 PWM_FSET be NC?

2、As shown in the figure below, our application is to short OUT1~OUT6 together and connect a string of 9 LED lights.
What resistor is connected to PIN31(LED_SET)?