UCC28951: Nosie issue at PWM outputs of UCC 28951 (UCC28951+UC27282 )

Tool/software:

Hi,

I am using UCC28951+UC27282, with Nosie issue at PWM output of UCC 28951, espically after PSFB turn on and loading current increase. 

Another symptom is lower side mosfet of leading leg with much higher temperature than other 3 primary mosfet (Iout<3A)

Attachment photos are PWM outputs of UCC28951.

Near no noise improvement adding cap at Vdd of UCC28951 & UC27282 (up to 22uF), add RC filter at input if UCC27282 (10R+220pF).

I also add ground connection from UCC28951 to ground of UCC27282/Vin cap ground/Vout cap ground, it is still no improvement

Could you advise how to minimize this noise?

Thanks