Hello everyone,
In the link below I designed a DC/DC Buck configuration with the L7987L chip. We have used this chip many times but I needed to update the EMI performance so I reduced some loops on the layout side. Also removed the separate ground plane. Now there is just one ground plane under the buck circuit.
I was actually surprised that it's not working anymore. Who can help me with this?
It is switching but it is not regulating into the 0.8V feedback for some reason. I tried changing the compensation network but without any result.
HELP !
PS. I tested with different input supply voltages from 9 to 24V. In the document below, I mentioned 2 supply voltages.
PS2. I also broke some chips. It looks really unstable somehow. I think they are broken because they didn't switch anymore.
Schematic, layout and signal images:
https://docs.google.com/document/d/16G_f4qjTBYnygG3ZKfBmmoWEJaGLDoRwkzUj4_T-XSY/edit?usp=sharing
