TPS23750PWPG4: The Power Over Ethernet (PoE) Controller

Texas Instruments\' TPS23750PWPG4 is a Power Over Ethernet (PoE) Controller module discrete solution, which helps to simplify and speed the design cycle for system designers. Engineers can greatly reduce their time-to-market and get their solutions up and running quickly.

Application Field

The TPS23750PWPG4 compliant with 802.3at, also known as PoE Plus, and is designed to integrate Power Over Ethernet (PoE) technology into enterprise network devices. PoE Plus provides higher current levels than the predecessor, known as PoE, and is capable of delivering nearly double the power at 25.5W (IEEE 802.3at) to PoE end-node devices such as IP phones, wireless LAN access points, and any other low-power peripheral device.

PoE Plus solutions, require static power supplies on each of the two ports for power, system integrators must also integrate power paths for powering the port, isolating the system from overvoltage, and other factors. However, incorporating all of the components needed in an efficient yet cost-effective solution presents many challenges.The TPS23750PWPG4 helps to simplify these design steps.

Working Principle

The TPS23750PWPG4 is a current mode PoE controller that dedicates a full port to each of the two ports of a two-port device and splits the common interconnection. It features active current sharing for the two ports, allowing for a maximum power output to each port of 25.5 W when over the required 802.3at threshold voltage. The controller features two output ports, each with its own current limit and power-OK output.

The TPS23750PWPG4 integrates functions to provide Ethernet (10/100/1000) isolation, protect against short circuits on the interconnection between the two ports, and protect against reverse power on either port. The controller also allows system designers to adjust the current limit of each port in external resistor dividers. In addition, the design also includes a non-powered state mode that can be used to power down a port when the host controller goes into a low power mode.

Conclusion

The TPS23750PWPG4 Power Over Ethernet (PoE) Controller was designed to provide a solution that is well-suited for enterprise networks. It provides isolation, surge protection, and current limitation for each of the two ports in the device. Additionally, it automatically splits the common interconnection between the two ports and allows for active current sharing. This makes it an ideal solution for PoE applications, allowing for much faster design cycles and time-to-market for system integrators.