SLUSBX9I March 2014 – July 2019 TPS23861
The TPS23861 is a four port, IEEE 802.3at PoE PSE controller and can be used in very simple, low port count, automatic or high port count micro-controller managed applications.
Subsequent sections describe detailed design procedures for applications with different requirements including host control.
The schematic of Figure 46 depicts automatic mode operation of the TPS23861, providing turnkey functionality ready to power PoE loads. No connection to the I2C bus or any type of host control is required. In Figure 46 the TPS23861 automatically:
Following a power-off command, disconnect or shutdown due to a start, ICUT or ILIM fault, the port powers down. Following port power off due to a power off command or disconnect, the TPS23861 continues automatic operation starting with a detection cycle. If the shutdown is due to a start, ICUT or ILIM fault, the TPS23861 enters into a cool-down period. After the end of the cool-down period the TPS23861 continues automatic operation starting with a detection cycle.
The TPS23861 will not automatically apply power to a port under the following circumstances: