JAJSES8B October 2017 – November 2018 TPS2372
The TPS2372 device is a 20-pin integrated circuit that contains all of the features needed to implement a single interface IEEE802.3bt Type-3 ( TPS2372-3) and Type-4 ( TPS2372-4) powered device (PD). Basic functionality supported includes Detection, Hardware Classification, and inrush current limit (200-mA for TPS2372-3 and 335-mA for TPS2372-4) during startup. Enhanced features include the automatic maintain power signature (MPS).
The TPS2372-3 integrates a low 0.3-Ω internal switch to support Type-3 applications up to 60 W of continuous power sourced by the PSE, allowing beyond 1.2 A (1.55 A minimum current limit) through the PD during normal operation.
Likewise, the TPS2372-4 integrates a low 0.1-Ω internal switch to support Type-4 applications up to 90 W of continuous power sourced by the PSE, allowing up to 1.9 A through the PD during normal operation.
The TPS2372 has a built-in inrush time delay period, for a simple solution to meet the IEEE802.3bt startup requirement.
The TPS2372 contains several protection features such as thermal shutdown, current limit foldback, and a robust 100-V internal switch.