TPS2377DG4

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Power Over Ethernet (POE) Controllers are rapidly becoming a popular solution for providing power and data transfer for many modern applications. Texas Instruments\' TPS2377DG4 is a highly integrated, IEEE 802.3bt compliant PoE+ (IEEE 802.3at Type 3) Controller that combines both the data and power transmissions associated with a device over a single Ethernet cable. The TPS2377DG4 is designed for a wide range of applications, ranging from IP phones, VoIP phones and gateways to wireless access points, web cameras and other types of digital devices.

The TPS2377DG4 enables the periodic monitoring of a powered device’s (PD) classification level and the powered device’s (PD) PoE power requirement. This provides a vital interface between the switching/routing Ethernet frame and the high voltage/current sections of the PoE circuit.

In applications that require up to 75W of power delivery, the TPS2377DG4 is a cost-effective solution due to its low external component count, high efficiency and scalability for simplicity of design. It is designed to deliver a maximum of 53W to a PD with standard Category 5 UTP cabling (T568B 6-pair PoE) and up to 75W to a PD with standard Category 6 UPT cabling (TIA/EIA-568-B.2-1 POE+).

The TPS2377DG4 provides a number of sophisticated solutions for both the data and power transmissions. The Power Distribution Management (PDM) function dynamically adjusts the power distribution across a network of PoE powered devices. This provides load monitoring, per unit tracking and precise control of power delivered to each PD. The TPS2377DG4 also includes intelligent current limiting circuitry that detects and protects against unexpected high current spikes in the PD.

On the data side, the TPS2377DG4 supports both 10/100/1000M Ethernet and fiber communications. During the detection phase, the controller will automatically detect active devices on the Ethernet cable and communicate with them using capabilities announcement, power classification and Link Integrity Test (LIT) commands. The TPS2377DG4 monitors link and data integrity to ensure communication reliability and guarantee a link status. Furthermore, the TPS2377DG4 low voltage differential signaling (LVDS) technology provides low EMI emissions for compliant PoE and PoE+ applications.

The TPS2377DG4 implements a number of fault protection techniques to protect both the device and PD from a variety of potential fault conditions. These include short circuit and over-temperature protection, undervoltage lock-out (UVLO), overcurrent protection and current surge protection.

Overall, the TPS2377DG4 is a reliable and cost-effective solution for powering devices over Ethernet. It is a flexible and scalable PoE+ controller that can provide power up to 75W and data communication between a network of PDs.

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