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To summarize, DC/DC design and PoE design are not simple tasks. This guide discusses some first steps to debug a PoE PD design. Following this guide helps find where the issue is occurring, if not discovering the issue itself. Narrowing down the problem area expedites the debug process for an experienced PoE PD debug engineer.
Review each component in the schematic, using the PoE PD Schematic Review Guidelines application report, which discusses every component in the design. Many PoE PD issues are found in the schematic, which is a great place to start the debug process.