Hi,
i am designing phase shift full bridge converter using UCC3895N. I got samples from TI which i am using for testing purpose.
Now i am testing the converter in openloop condition. 3326.testing.pdf
The operating frequency is :50KHz.
The input supply to UCC3895N is 15V
The input supply to gate driver card is 24V, both 24V and 15v gnd are shorted
The input to the power stac(H bridge) is from transformer rectifier .
when ever i am incresing ( by varing varic at input side ) the input of the power stac above 70V, the UCC3895N is getting damaged (fumes are coming out of IC and pins15,16,17 are getting shorted ).The connections of UCC3895N are 4401.UCC3895N PCB.pdf. Please help me to solve this.