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PoE controller eases sub-13W designs

Posted: 23 Jul 2008 ?? ?Print Version ?Bookmark and Share

Keywords:PoE controller? sub-13W designs? isolated DC/DC switching? Power over Ethernet?


Expanding on the company's line of PoE controllers, Texas Instruments Inc. introduced a 13W PoE powered device controller with onboard DC/DC converter specifically 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, to name a few.

The TPS23753 is optimized for isolated DC/DC switching topologies, including flyback topology. The TPS23753 will operate on a wide range of local power supplies in cases where PoE power is not available. The device operates from 12V to 57V, including operation down to 9.5V to support droop on any 12V 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 12V adapters.

To ease design with local power supplies, 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.

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 from TI.

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