Power over Ethernet

Texas Instruments has developed a new ‘Power-over-Ethernet’ plug-in power module that uses a new single chip controller it has designed for the purpose.

The controller, the TPS2375, was created using TI’s linear Bi-CMOS, silicon-on-insulator (LBC-SOI) process technology, which lets it withstand transients up to 100 V and operate over an industrial temperature range of -40 degrees C to 85 degrees C. The device also features 15-kV system-level electrostatic device (ESD) capability. In addition, it has an internal 0.6-ohm FET to minimise heat dissipation in the system.

The controller further protects the powered device by implementing a 450-mA operating current limit, thermal shutdown and in-rush current limiting. The device uses a tiny external resistor to program in-rush current limit, enabling interoperability between a wide range of IEEE 802.3af-compliant and pre-802.3af “legacy” systems.

The IEEE 802.3af-compliant PTB48540 plug-in power module requires only a small external isolation transformer to work. TI’s TPS2375 controller sits inside the module, as well as an electro-magnetic interference (EMI)/input voltage transient filter, and both data and spare line bridge networks. The module is available in 3.3-V, 5-V or 12-V outputs with through-hole or surface mount device (SMD) mounting options.

The TPS2375 and PTB48540 recently passed independent IEEE 802.3af parametric tests and interoperability tests conducted at The University of New Hampshire’s Power-over-Ethernet Interoperability Lab (UNH IOL). The IOL regularly conducts testing with TI’s technology and equipment from other members of the university’s Power-over-Ethernet consortium, such as Cisco, Nortel, 3Com, AVAYA, Extreme Networks and HP.

The TPS2375 powered device controller and the PTB48540 plug-in module are available in volume today from TI and its authorized distributors. The TPS2375 is packaged in an 8-pin (SOIC) or 8-pin thin shrink small outline package (TSSOP), and the PTB48540 comes in a 13-pin, double-sided, through-hole or surface-mount package.

Suggested resale pricing is $1.25 each for the TPS2375 in quantities of 1,000 units, and $26 for the PTB48540 in quantities of 1,000.

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