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UCC3808-2: OUTPUT issue

Part Number: UCC3808-2

Hello,

We are using UCC3808-2 for Generating 40V adjustable supply. Kindly find schematic in attachments.

We are providing Pulses as below :

1)"Dutycycle" = 100hz(10%,20%,50%,100%)

2)"PWR" = 100hz (0.1us increment)

3)IRF,VRF : 1MHZ

So at starting,when PWR = 0.1-0.5uS,The output waveform at TP4 is stable but with the Increment of PWR signal it is being distorted as shown below:

us_psu_sch_v1_0.pdf