PCB layout guidelines to optimize power supply performance

Download the presentation
www.ti.com/lit/pdf/SLYP762
This presentation will focus on the fundamental concepts of printed circuit
board (PCB) or printed wiring board (PWB) layout for switch mode power
supplies. These concepts help deliver successful power supply designs
irrespective of power levels and topologies. Also included will be basic
layout parameters influencing the performance of the design, how these
parameters manifest and how to control them. We will explore EMI, thermal
performance and layout examples. This presentation is not only useful for
engineers who are performing the PCB layout activities but also those
engineers who are involved in reviewing the power supply designs and those
who are troubleshooting power supply designs for various issues.
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[@whiterabbitangel]

i would say putting the void under the switch node will likely to create more EMI issues because i consider the switch node as a high speed digital signal. Any thoughts?

[@rolandoaguilera3114]

Assuming a 2-layer board, hence if the area is void, there would be no or minimum coupling because a capacitor is formed by 2 conductors and an internal dielectric. Having a void means you don't have the needed plane/conductor to create a parasitic capacitor

[@brianernzen2509]

Where’s the ground plane? Every trace should be one dielectric distance from an uninterrupted return reference. I don’t understand converter data sheets that show ground pours on the top when layer 2 should be a solid ground plane.

[@xxxkueckxxx]

This isn’t a UHF transmitter.