Expanding on its line of Power over Ethernet (PoE) controllers, Texas Instruments has introduced a 13 W PoE powered device controller with onboard DC-DC converter specifically designed to meet the needs of IEEE 802.3af-compliant applications. The new, 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 optimised for isolated DC-DC switching topologies, including flyback. It operates on a wide range of local power supplies in cases where PoE 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% duty cycle and current slope compensation, reducing output rectifier stress for 12 V 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.
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