I did reference using TPS92515HVEVM-749 schematic.
It worked dim with fix IADJ and PWM 16KHz.
Because of flicker, I had to change the fsw frequency(580KHz -> 700KHz).
and It was working mistic.
When I was PWM Dim up, LED was more illuminated and stay normally.
I did change the PWM frequency 1KHz to 16KHz.
But 1~10KHz PWM frequency had made an Inductor's ringing noise.
I did Dim up, more illuminated's problem is made currently.
I want to know about that.
Below is my schematic
Vin was average 52V. Vled is below 46V. Iled is Max 0.8A.