This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

UCC2808A-2: Trouble with PWM duty cycles

Part Number: UCC2808A-2

Hi Dear Support!

I'm trying to run the device from WEBENCH designer, here's the link:

The problem is UCC2808A-2 is not reacting for changes of Vin and (or) Vout. I have tested circuit with full range of Vin (14-50 VDC) and the PWM signal delivered to MOSFET's gate are always +/- 47% DC. Could you help me with diagnosis which feedback loop is not working? I don't understand how the IC is setting DC, by current on FB pin? Could explain me like for a newbie wich loop is setting DC and how? 
Thanks in advance for your response.