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26-Watt Power over Ethernet Controller for IP Surveillance Cameras and Phones

23rd September 2006

ES Admin

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Texas Instruments has introduced a 26-watt Power over Ethernet (PoE) controller that allows Ethernet-powered devices, such as IP surveillance cameras, WiMAX access points and conference IP phones, to use twice as much power from a standard Ethernet cable - without the need of an AC line. TI will demonstrate the new power management integrated circuit (IC) in a high-power PoE reference design at the ASIS International security conference in San Diego, September 25-28.

TI's 8-pin, TPS2376-H controller contains all of the features needed to develop an IEEE 802.3af-compliant powered device with innovative safety features including a programmable, 600-mA current limit with thermal shutdown, auto-retry and fault protection. The high-power device also
allows a designer to implement a non-standard powered device that draws up to 26 watts of power from power source equipment (PSE) with a minimum of 52 volts of input and over 100 meters of CAT-5 Ethernet cable. The TPS2376-H supports voltage transients up to 100 V at 600-mA. In
addition, the device can operate at 24 V over an industrial temperature range of -40C to 85C, enabling support of emerging Ethernet-powered medical and industrial equipment.

Requiring a minimum number of external components, the flexible TPS2376-H is housed in a PowerPadT package with an integrated 0.6-ohm FET to minimize heat dissipation in the system. The controller's simple front-end architecture gives designers increased flexibility when designing the back-end power stage topology. In addition, the TPS2376-H eases powered device startup capability with adjustable in-rush current limit and an auto-retry feature, which provides automatic start-up on
fault. The controller's power conversion functionality includes several additional protection and low-noise features, such as 15-kV system-level electrostatic discharge (ESD) capability, adjustable undervoltage lockout and open drain power good reporting.