Part Number: TPS54561-Q1
TPS54561-Q1, input 22.4V, output 5.1V. Load is minimal <10mA. Design load is 4A. High side switch has very significant ringing, which is causing ~3Vpp noise on the input rail, and ~800mV oscillation on the outputs. In picture 2, you can see the overshoot is about 5 volts (peak vs high). The layout and schematic are shown below. I think I need to fix the layout, but I'm not sure what I could do to make the loop area smaller. The recommended layout is shown last. I know I have deviated slightly, but my inductor is also much larger than shown in the layout example. Is the problem that I put some of the components on the bottom side?
Happy to hear suggestions, thank you.
Image may be NSFW.
Clik here to view.
Image may be NSFW.
Clik here to view.
Image may be NSFW.
Clik here to view.
