Power over Ethernet controller doubles up

A 26W PoE controller allows Ethernet-powered devices to use twice as much power from a standard Ethernet cable - without the need for an AC line.

Texas Instruments has introduced a 26W 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 for an AC line.

TI's 8-pin, TPS2376-H controller contains all of the features needed to develop an IEEE802.3af-compliant powered device with innovative safety features including a programmable, 600mA current limit with thermal shutdown, auto-retry and fault protection.

The high-power device also allows a designer to implement a nonstandard powered device that draws up to 26W of power from power source equipment (PSE) with a minimum of 52V of input and over 100m of Cat5 Ethernet cable.

The TPS2376-H supports voltage transients up to 100V at 600mA.

In addition, the device can operate at 24V over an industrial temperature range of -40 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 PowerPad package with an integrated 0.6ohm FET to minimise 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 15kV system-level electrostatic discharge (ESD) capability, adjustable undervoltage lockout and open drain power good reporting.

TI provides IEEE802.3af-compliant powered device controllers and power sourcing equipment manager ICs, which manage power in multiple Ethernet ports.

Leveraging its volume production capabilities and systems expertise, the company has shipped PoE circuits to a broad base of customers around the world.

TI is a founding member of the PoETec Consortium, University of New Hampshire's PoE Consortium and chairs the High-Power PoE task force in the IEEE802.3at standards committee.

The TPS2376-H powered device controller is available in volume today from TI and its authorised distributors.

Packaged in an 8-pin, SOIC package, suggested resale pricing for both devices is US $1.25 each in quantities of 1000 units.

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