DALLAS - Texas Instruments Incorporated (TI) announced
its third generation Power-over-Ethernet controller technology that eases implementation of Ethernet-powered devices
such as WLAN access points, IP phones, security and RFID scanners.
is a highly integrated circuit (IC) that combines the functionality of TI's TPS2375 powered device (PD) controller
with a primary side DC/DC pulse-width modulation (PWM) controller to effectively manage discovery, classification
and delivery of direct-current (DC) power to an end appliance. Requiring a minimum number of external components,
the flexible TPS23750 offers the highest levels of performance and flexibility to enable IEEE 802.3af functionality
in a powered device.
The unique controller supports non-isolated or isolated power supply topologies
required by WLAN access point systems, IP phones and other systems, including flyback, forward or non-synchronous
low-side buck topologies.
The TPS23750 can withstand voltage transients up to 100 V and operates
over an industrial temperature range of -40º C to 85º C. In addition, the controller is housed in a
PowerPadTM package with an internal 0.7-ohm FET to minimize heat dissipation in the
system. The TPS23750 also protects the powered system through thermal shutdown and current limiting.
The integrated device relies on a tiny external resistor to set the switching frequency, allowing
greater flexibility for power stage component selection. A fixed 140-mA of in-rush current limit also eases powered
device startup. The TPS23750's power conversion functionality includes many additional protection features, such as
programmable soft start, hiccup-type fault limiting, a 50 percent maximum duty cycle and a true-voltage output error
To meet power requirements of certain legacy systems not fully 802.3af-compliant, TI also
announced its TPS23770 integrated PD controller, which includes an under-voltage lockout turn-on voltage that is
compatible to legacy systems.
Leading Power over
Ethernet and IP Phone Technology Portfolio
TI provides IEEE 802.3af-compliant powered device
controllers and power sourcing equipment manager ICs, which manage power in multiple Ethernet ports. Leveraging its
volume production capabilities, TI to date has shipped Power-over-Ethernet ICs to a broad base of customers around
the world. TI's highly integrated TNETV1050 IP phone system-on-a-chip incorporates TI's Power-over-Ethernet
technology, providing increased capability and reliability when implementing Ethernet-powered IP phones. TI is the
leading supplier of VoIP semiconductor products.
The TPS23750 and TPS23770 powered device controllers are available in volume today from TI and its authorized
distributors. Packaged in a 20-pin, high-power, thin shrink small outline package (HTSSOP), suggested resale pricing
for both devices is $1.75 each in quantities of 1,000 units. Evaluation modules of the TPS23750 and TPS23770,
complete reference designs, application notes and technical documentation are available