SLVAF59 April   2021 TPS2372 , TPS2373 , TPS23730 , TPS23731 , TPS23734 , TPS2375 , TPS2375-1 , TPS23750 , TPS23751 , TPS23752 , TPS23753A , TPS23754 , TPS23754-1 , TPS23755 , TPS23756 , TPS23757 , TPS23758 , TPS2376 , TPS2376-H , TPS2377 , TPS2377-1 , TPS23770 , TPS2378 , TPS2379

 

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1 Introduction

The following document provides a step-by-step procedure to review Power over Ethernet designs for the Powered Device side of the cable, and the accompanying DCDC. The best advice is to find an EVM or reference design that most closely matches the design. For example, if the design is a 5-V output synchronous flyback with a 48-V adapter on the primary with the TPS23758, use the TPS23758EVM-080 to compare. Check every component and note the differences. The following is a detailed process for reviewing schematics. Some components will have more details than others since some are typically changed or changing them has known effects. Others typically remain the same. Following the IEEE standard for PoE (802.3) is normally recommended because that enables interoperability. There are certain components that cannot be changed or the tolerance is minimal to meet the standard. However, many TI parts also integrate a DCDC controller, where there is more freedom to choose parts. Please consider the guidance with standards as immoveable and guidance to DCDC as advice.