Texas Instruments Incorporated, a semiconductor company, has unveiled a new high-efficiency, high-power Power-over-Ethernet controller, the “TPS23754,” designed for 13-watt or 26-watt powered device applications, such as IP phones, wireless access points or security cameras. 

 

In general, Power over Ethernet is a technology that describes a system to transfer electrical power, along with data, to remote devices over standard twisted-pair cable in an Ethernet network. Ideal for powering IP telephones, wireless LAN access points, network cameras, remote network switches, embedded computers, and other appliances, PoE are useful where it would be infeasible to supply power separately.

 

TI’s TPS23754 is fully compliant to the IEEE (News - Alert) 802.3at (draft 4.0) standard. This integrated single-chip PoE solution supports high-efficiency isolated flyback and forward DC/DC converter topologies, which can achieve up to 90 percent power conversion efficiency, thereby reducing heat as well as increased reliability of the system. The solution makes use of a 100-V monolithic SOI manufacturing process, in order to offer a robust solution in a 13-watt or 26-watt design.

 

Some of the other key features of the new PoE controller includes complementary auxiliary driver with programmable dead-time, PD controller that supports up to 825-mA continuous current and power source selection priority.

 

TI’s new PoE controller natively supports external, local power sources with or without PoE power present. The powered device’s front end protects against current inrush and short circuits

TI said that it is also sampling the TPS23756, in order to support auxiliary input voltages as low as 12 V. This facilitates a PoE designer to use popular, inexpensive 12-V wall adapters.

 

TPS23754 has no error amplifier and has programmable auxiliary or local power support. All the PoE controllers have switching frequency up to 1MHz and duty cycle of 78 percent. The devices can operate at 24 V over –40° to 85°C, said the company.

 

TI said that both the TPS23756 and TPS23757 will be available in the third quarter. Available in a HTSSOP-20 package, TPS23754 is priced at $1.90 in quantities of 1,000, while TPS23757 is priced at $1.65 in quantities of 1,000.