Coupled with an external power-over-Ethernet (PoE) isolation transformer, the PTB48540 module from Texas Instruments delivers up to 10 W at 3.3, 5, or 12 V. This plug-in power module fully complies with IEEE 802.3af, suiting IP phone consoles, security systems, card readers, point-of-sale terminals, and other Ethernet-powered devices.

Each module incorporates a dc-dc converter. Internal input diode bridges support both data-line and spare-line pair standard Ethernet connections. An input transient suppressor and an electromagnetic-interference filter provide additional protection. With the module's "Output Inhibit" control, the output voltage can be turned off to support an idle condition or power-saving mode. Other features include input undervoltage lockout (UVLO), overcurrent and short-circuit protection, output voltage adjust/trim, and overtemperature protection.

The 41- by 38- by 8.5-mm module is built around one version of TI's latest PoE controller chip, the TPS2375. Three versions of the controller chip are available for designers who want to roll their own PoE supplies. The TPS2375 has 802.3af-compliant UVLO limits. The TPS2377 supports legacy UVLO limits. The TPS2376 has a programmable UVLO via a dedicated input pin. In addition to the basic functions of detection and classification, these controllers include an adjustable inrush limiting feature.

The PTB48540 comes in a 13-pin, double-sided, through-hole or surface-mount package. The TPS2375 is packaged in an eight-pin SOIC or TSSOP. Pricing is $26 for the complete module and $1.25 for the chip, both in 1000-unit lots.

Texas Instruments
www.ti.com
(972) 644-5580

See associated figure

Reprints

Printer-Friendly

Email this Article

RSS

Submit PlanetEE del.icio.us Digg Reddit Newsvine StumbleUpon Netscape Yahoo MyWeb Live Bookmarks Fark  Submit

Font Size

What's This?

MLCCs Stand Up To ESD Quad-Output Controller Trims Parts Count Video Filter/Buffers Boost Performance And Integration 45W Supplies Power Electrostatic Air And Oil Cleaner Devices Desktop HDD Packs 500 GB Per Disk 1A Switching Regulators Perform As High-Efficiency Replacements

A New Design Inflection Point Forecasting Industry Growth For 2009 And Beyond EDA Retools To Exploit Multicore Architectures Design And Verification Move Up In Abstraction EDA Retools To Exploit Multicore Architectures A New Design Inflection Point Design And Verification Move Up In Abstraction Challenges Lurk For 22-nm Physical Implementation

1) Build A Smart Battery Charger Using A Single-Transistor Circuit (243 views today) 2) 2008 BEST Electronic Design Winners (108 views today) 3) What's All This Transimpedance Amplifier Stuff, Anyhow? (Part 1) (93 views today) 4) Efficient DC-To-AC Inverters Charge Equipment Racks (82 views today) 5) 1-A Switching Regulators Operate With 96% Efficiency To Replace Linear Regulators (81 views today) ALL TOP 20

POST YOUR COMMENTS HERE Name: Email:
Your Comments: Enter the text from the image below Please refresh the page if you have trouble reading this text.