The DC/DC converter is a 5-V output buck converter with a BOM option for 3.3 V. A small prototype area is included on the printed-circuit board. The EVM accepts a TPS23770 in place of the TPS23750 to support a PD with a legacy undervoltage lockout (UVLO) threshold.
The EVM has separate LEDs that show when the DC/DC converter and the PoE interface are active. Test points are provided at all critical nodes. Power to the EVM is provided over the spare or data lines in an Ethernet cable or by an auxiliary source like a wall adapter.