Texas Instruments Launches PoE Controller for Sub-13-W Designs

Texas Instruments Incorporated (TI) has introduced its 13-W PoE powered device controller with onboard DC/DC converter designed to meet the needs of IEEE 802.3af-compliant applications. The highly-integrated device eases system design and size for PoE applications, including IP phones, IP security cameras, wireless access points, security card readers, and RFID scanners. The TPS23753 is optimized for isolated DC/DC switching topologies, including flyback topology. The TPS23753 will operate on a range of local power supplies in cases where Power over Ethernet power is not available. The device operates from 12 V to 57 V, including operation down to 9.5 V to support droop on any 12-V local power supply. The DC/DC converter allows for operation in this range with an 80 percent duty cycle and current slope compensation, reducing output rectifier stress for 12-V adapters.

The TPS23753 features adapter priority programming that allows the designer to select which power source to use when both PoE and local power are available. Native support for this prioritization eases design and reduces system size by eliminating external components. The TPS23753 builds on TI’s portfolio of Power over Ethernet powered device controllers and power sourcing equipment (PSE) solutions. The TPS23750 remains an optimal choice for designers seeking additional DC/DC topologies, including non-isolated and buck. The TPS2376-H is the industry’s first 26-watt PoE PD controller that allows Ethernet-powered devices to draw twice as much power from a standard Ethernet cable. TPS23753 is currently available from TI and its authorized distributors in 14-pin TSSOP packaging. Suggested resale price is $1.45 in quantities of 1,000. Evaluation modules of the TPS23753 are available online.