Product category: Power Supply ICs and Controllers
News Release from: Texas Instruments (April 2001-March 2006) | Subject: TPS2375 and PTB48540
Edited by the Electronicstalk Editorial Team on 19 May 2004
Easy route to power over Ethernet
Texas Instruments has developed a versatile new IC controller and the industry's first power-over-Ethernet plug-in power module
Texas Instruments has developed a versatile new IC controller and the industry's first power-over-Ethernet plug-in power module that reduces design time and eases implementation of Ethernet-powered industrial and commercial devices such as WLAN access points, IP phones, security and point-of-sale systems.
This article was originally published on Electronicstalk on 19 May 2004 at 8.00am (UK)
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TI's new TPS2375 controller builds on the success of the TPS2370, introduced in 2003, to effectively manage discovery, classification and delivery of DC power to a powered device.
The IC offers increased flexibility and performance as it manages the interface between the power source equipment (PSE) and a commercial or industrial powered device (PD), while providing necessary power management control and protection.
The TPS2375 was created using TI's linear BiCMOS, silicon-on-insulator (LBC-SOI) process technology, which lets the controller withstand transients up to 100V and operate over an industrial temperature range of -40 to +85C.
The device also features 15kV system-level ESD capability, adding unprecedented versatility to support extreme power-over-Ethernet environments.
In addition, the controller has an internal 0.6ohm FET to minimise heat dissipation in the system.
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The controller further protects the powered device by implementing a 450mA operating current limit, thermal shutdown and inrush current limiting.
The device uses a tiny external resistor to program in-rush current limit, enabling interoperability between a wide range of IEEE802.3af-compliant and pre-802.3af 'legacy' PSE systems.
Realising time to market is critical, TI has also released the industry's first, fully IEEE802.3af-compliant plug-in power module for Ethernet-powered devices.
The PTB48540 module significantly reduces time to market for designers of specialised, Ethernet-powered IP phone consoles, security systems, card readers, point-of-sale terminals or other systems that need to quickly detect, classify and deliver up to 10W of DC power.
Requiring only a small external power-over-Ethernet isolation transformer, the low-profile module (41 x 38 x 8.5mm) provides a complete power solution for powered devices.
TI's TPS2375 controller sits inside the module, as well as an EMI/input voltage transient filter, and both data and spare line bridge networks.
The module is available in 3.3, 5 or 12V outputs with through-hole or surface mount device (SMD) mounting options.
The TPS2375 and PTB48540 recently passed independent IEEE802.3af 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.
In May 2003, TI delivered the industry's first IEEE802.3af-compliant powered device controller, the TPS2370, and power sourcing equipment manager, the TPS2383, which manages power in multiple Ethernet ports.
Leveraging its volume production capabilities, TI's technology is currently being designed into hundreds of powered devices at leading companies around the world.
TI also plans to incorporate the TPS2375 in its next-generation TNETV1050 IP phone solution, a highly integrated system-on-a-chip offering unparalleled scalability and processing technology for manufacturers of IP phones.
Evaluation modules of the TPS2375 and PTB48540, complete reference designs, application notes and technical documentation are also available.
The TPS2375 powered device controller and the PTB48540 plug-in module are available in volume today from TI and its authorised 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 1000 units, and $26 for the PTB48540 in quantities of 1000.
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