Hello,
I have problem with design DC2DC circuit around the TPS55330.
I summarized the problem at the attached PDF file but in title-
I design DC2DC PCB that can select the output voltage between 3 levels by select feedback resistor.
I tested the PCB under load (2A) and the output voltage holds perfect.
I add the design to my main PCB (same design) and that time the voltage was OK without load and with load the voltage on "FB" stars to change around 1.229V and because of that the output voltage was not stable.
Can someone help me to put the finger on the PCB area that can cause "FB" voltage not stable?
Thanks
Yuval