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PoE controllers claim 20% higher efficiency

Posted: 17 Oct 2012     Print Version  Bookmark and Share

Keywords:controller  PoE  PMIC  Ethernet 

Texas Instruments Inc. launches the TPS23751 and TPS23752 controllers that combine a PoE powered device manager with a DC/DC controller.

The PMICs are said to deliver 20 per cent higher conversion efficiency compared to other solutions on the market. They are targeted at IEEE 802.3at type 2 (high-power) compliant PoE designs, used in IP phones, surveillance cameras, wireless access points, as well as various industrial applications.

Both devices generate up to 25.5W to the PoE loads. They offer green-mode operation. During light load conditions, both devices switch off the synchronous rectifier and go into variable frequency operation. This feature enables efficiencies greater than 80 per cent at 20 per cent load operation and maintains high efficiency from very light to full load.

Their integrated single-chip packaging saves space and component count, and an integrated DC/DC controller to convert input voltage to 3.3V, 5V or 12V.

Also, the TPS23572 offers a deep sleep-mode feature that continues generating the maintain power signature after disabling the converter to minimise power consumption.

Evaluation modules and an application note on "Implementing a 60W, End-to-End PoE System," are available to help engineers quickly evaluate and design with these devices.

The TPS23751 comes in a 16-pin TSSOP and the TPS23752 in a 20-pin TSSOP. Both are prices at Rs.81.52 ($1.50) in 1,000 unit quantities and are available to sample and purchase.

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