TPS23751PWP

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TPS23751PWP is a Power over Ethernet (PoE) controller that integrates a 30 V, 4.5 A power MOSFET into a 12-pin TSSOP package. This device provides a cost-effective solution for systems designers who require a low-cost, yet high-performance single-chip solution for powering devices over Ethernet. The TPS23751PWP supports IEEE 802.3af compliant PoE as well as Cisco’s proprietary PoE systems. It is capable of supplying up to 15.4 W of power while operating in an extremely small footprint on the printed circuit board.

The TPS23751PWP operates in two modes: Class 0 Class 1 and Class 2. In Class 0 mode, the device provides 15.4 W of power for Category 4 ends (e.g., VoIP phones, IP phones, network cameras…etc). In Class 1/2 mode, the device provides up to 12.95 W of power for Category 3/4/5 ends including Ethernet nodes, notebook computers, wireless access points, and IP cameras.

TPS23751PWP works with two sources of information in order to operate properly: inputs from the side of the Powered Device (PD) and control signals generated internally. The device monitors the Voltage Interface (VI) current sense pin to detect the presence of a PD. If the VI pin current goes above the Class Detection current of 6.6 mA, the device will then enter into Searching mode. In Searching mode, the device will continually sample the voltage level on the Port Data pair in order to detect the presence of a valid PoE signature. Once a valid signature is detected, the device will then begin to classify the PD and accordingly adjust the output voltage level.

The TPS23751PWP employs several algorithms to ensure the highest level of protection for both the Powered End (PE) and the PD. It monitors the voltage on the VI pin, the voltage on the Port Data pair, the current on the VI pin, and the ambient temperature of the system to ensure that the PD is not over supplied. Additionally, the device implements an auto shut-off feature that will enable the device to shut off the power if it detects an overload or short circuit fault on the PD.

Application fields for TPS23751PWP are powered bridges, access points, and any other device requiring PoE power. This includes IP cameras, IP phones, network bridges and many other devices that would benefit from the convenience and reliability of having their power supplied over Ethernet cables. This device\'s low-cost and high-performance make it an ideal solution for any designer requiring a single-chip solution for powering devices over Ethernet.

In conclusion, the TPS23751PWP is a single-chip solution for powering devices over Ethernet. It is capable of supplying up to 15.4 W of power while operating in an extremely small footprint and utilizes various algorithms to ensure the highest level of protection for both the Powered End and the Powered Device. The device is suitable for a variety of applications, including access points, bridges, IP phones, cameras and more. Additionally, it is compliant with IEEE 802.3af and can be used for both Class 0 and Class 1/2 PoE applications.

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