Type-three eight-channel PoE PSE controller with SRAM
The TPS23882 from Texas Instruments is an eight-channel power sourcing equipment (PSE) controller engineered to insert power onto Ethernet cables in accordance with the IEEE 802.3bt standard. The PSE controller can detect powered devices (PDs) that have a valid signature, determine the power requirements of the devices according to their classification, and apply power.
The TPS23882 improves on the TPS2388 with reduced current sense resistors, selectable Autonomous operation, SRAM programmability, programmable power limiting, capacitance measurement, and compatibility with TI’s FirmPSE system firmware.
Dedicated per port ADCs provide continuous port current monitoring and the ability to perform parallel classification measurements for faster port turn on times. A 1.25A port current limit and adjustable power limiting allows for the support of non-standard applications above 60W sourced. The 200mΩ current sense resistor and external FET architecture allow designs to balance size, efficiency, thermal and solution cost requirements.
Port remapping and pin-to-pin compatibility with the TPS2388, TPS2380, and TPS2381 devices eases migration from previous generation PSE designs and enables interchangeable two-layer PCB designs to accommodate different system PoE power configurations.
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