Texas Instruments' has introduced its third generation Power-over-Ethernet controller technology to ease implementation of Ethernet-powered devices such as WLAN access points, IP phones, security and RFID scanners.
The TPS23750 is a highly integrated part 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 DC power to an end appliance. The device requires a minimum number of external components.
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 is designed to withstand voltage transients up to 100 V and operates over an industrial temperature range of -40-85°C. In addition, it is housed in a PowerPad package with an internal 0,7 Ω FET to minimise heat dissipation in the system. It also protects the powered system through thermal shutdown and current limiting.
To meet power requirements of certain legacy systems not fully 802.3af-compliant, TI's TPS23770 integrated PD controller is available, which includes an under-voltage lockout turn-on voltage that is compatible to legacy systems.
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