Part Number:PMP9720
Hi team,
We are using UCC2897A as ACF controller and PMP9720 as our circuit model. However, the Aux winding voltage dropped under controller working voltage Vcc cause the PWM stopped and Vout dropped. Could you give us some suggestions to debug this issue. Another question is, the output voltage would not be established while D8, R7 are being connected. Which means the output is normal while DRV being removed. We are trying to add additional power as the UCC27511 VDD. Unfortunately, this cause SR MOSFET damaged. Could you give us some suggestions? Thank you for your supporting.