LM5146-Q1: LM5146-Q1

Part Number: LM5146-Q1
Other Parts Discussed in Thread: LM5146

Tool/software:

Hi,
I have a doubt in the resistance value connected with the RT pin of LM5146 IC, if I keep the resistance open which is connected with the RT pin in place of 100k ohm then what will happen with LM5146?
Is PWM pulse generated or not? if it's not generating a PWM pulse then why?
Can you please explain this condition of resistance open at RT pin?