Hi,
I have a LM5088MH-2 to step down 48V to 30V DC. However the output has a 3VP-P ringing
I have used the webbench tool to come up with the values as well. I am not sure which part of my layout needs to be improved in order to solve this noise issue.
The above picture shows the layout of my circuit which the LM5088 is located. The power ground plane run under the entire area, connected to logic ground via the R95-R97 resistors. The signal transistors U28/U30/U31etc in the proximity of the LM5088 are affected badly by the switching noise.
I have tried to change the 4 x 47uF output capacitors to one single cap with lower ESR but to no avail.