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PoE Controller fromTexas Instruments Will Deliver Greater than 90 Percent Efficiency
Texas Instruments Incorporated 2009/5/25

Integrated PoE Plus controller meets new standard for powered device applications.

Integrated PoE Plus controller meets new standard for powered device applications.


Texas Instruments Incorporated (TI) introduced a high-efficiency, high-power Power-over-Ethernet (PoE) controller for 13-watt or 26-watt powered device (PD) applications, such as IP phones, wireless access points or security cameras. Fully compliant to the IEEE 802.3at draft 4.0 standard, the integrated TPS23754 supports DC/DC converter topologies that can achieve higher than 90 percent power conversion efficiency, which reduces heat and increases reliability of the system. The single-chip PoE solution leverages a 100-V manufacturing process to provide a robust solution in a 13-watt or 26-watt design.


Along with the TPS23754, TI is sampling the TPS23756 to support auxiliary input voltages as low as 12 V, allowing a PoE designer to use popular, inexpensive 12-V wall adapters. Additionally, the TPS23757 will support 13-W and below applications requiring the higher efficiency DC/DC topologies. Both the TPS23756 and TPS23757 will be available later on.


Key features of the chip:
· Complementary auxiliary driver with programmable dead-time 
· PD controller supports up to 825-mA continuous current
· Power source selection priority
· Current and inrush limit
· 100-V monolithic SOI process


Key benefits it delivers:
· Supports high-efficiency isolated flyback and forward DC-DC converter topologies
· Implements IEEE 802.3at (draft 4.0) for PD applications requiring greater than 13W
· Natively supports external, local power sources with or without PoE power present
· PD front end protects against current inrush and short circuits
· Robust manufacturing process withstands voltage surges up to 100 V at the IC

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