TI Unveils 100-V Power-Over-Ethernet Controller For IP Phones And WLAN Systems
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.
The TPS23750 is a highly integrated circuit that combines the functionality of TI´s TPS2375 powered device controller with a primary side DC/DC pulse-width modulation (PWM) controller to effectively manage discovery, classification and delivery of direct-current power to an end appliance.
The 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 —40°C to 85°C. In addition, the controller is housed in a PowerPad 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 amplifier.
To meet power requirements of certain legacy systems not fully 802.3af-compliant, TI also announced its TPS23770 integrated powered device controller, which includes an under-voltage lockout turn-on voltage that is compatible to legacy systems.
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 through power.ti.com/poe.
Source: TI
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