SLVS933D July 2009 – December 2020 TPS23753A
APD forces power to come from an external adapter connected from VDD1 to RTN by opening the hotswap switch. TI recommends using a resistor divider. The divider provides ESD protection, leakage discharge for the adapter ORing diode, and input voltage qualification. Voltage qualification assures the adapter can support the PD before the PoE current is cut off.
The CLS output is disabled when a voltage above VAPDEN is applied to the APD pin.
Place the APD pulldown resistor adjacent to the APD pin.
APD must be tied to RTN when not used.