TPS23881 Texas instruments

TPS23881

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TPS23881

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Описание

The TPS23881 is an 8-channel power sourcing equipment (PSE) controller engineered to insert power onto Ethernet cables in accordance with the IEEE 802.3bt standard. The eight individual power channels can be configured in any combination of 2-Pair (1-channel) or 4-Pair (2-channels) PoE Ports. The PSE controller can detect powered devices (PDs) that have a valid signature, complete mutual identification, and apply power.The TPS23881 improves on the TPS23880 with reduced current sense resistors, more accurate programmable power limiting, capacitance measurement and the ability to operate from ROM (see Device Comparison Table). The TPS23881 is also compatible with TIs FirmPSE system firmware, which provides a fully configurable solution for controlling multiple TPS23881 devices in systems offering up to 48-ports of 4-pair PoE power. Programmable SRAM enables in-field firmware upgradability over I 2C to ensure IEEE compliance and interoperability with the latest PoE enabled devices. Dedicated per port ADCs provide continuous port current monitoring and the ability to perform parallel classification measurements for faster port turn on times. A ±2.5% accurate programmable port power limit provides the ability to expand the maximum power sourced from 90 W to upwards of 125 W. The 200-mΩ current sense resistor and external FET architecture allow designs to balance size, efficiency, thermal and solution cost requirements.

IEEE 802.3bt PSE solution for PoE 2 Type 3 or Type 4 Power over Ethernet applications
Eight independent PSE channels
Compatible with TI’s FirmPSE system firmware
SRAM Programmable memory
Programmable power limiting accuracy ±2.5%
200-mΩ current sense resistor
Legacy PD capacitance measurement
Selectable 2-pair or 4-pair port power allocations
- 15.4 W, 30 W, 45 W, 60 W, 75 W or 90 W
Single and dual signature PD compatibility
Dedicated 14-bit integrating current ADC per port
- Noise immune MPS for DC disconnect
- 2% current sensing accuracy
1- or 3-bit fast port shutdown input
Auto-class discovery and power measurement
Inrush and operational foldback protection
Flexible processor controlled operating modes
- Auto, semi auto and manual / diagnostic
Per port voltage monitoring and telemetry
–40°C to +125°C temperature operation
Ultra Low Alpha (ULA) packaging (TPS23881A)

Vin (min) (V)	44
Vin (max) (V)	57
ILIM	Programmable
PoE standards supported	802.3at Type 1 (802.3af), 802.3at Type 2, 802.3bt Type 3, 802.3bt Type 4
FET	External
MPS method	DC Disconnect
Pair control	2-Pair Alt A, 4-Pair
Operating temperature range (°C)	-40 to 125
Features	Auto Mode, Current Limit with Foldback, Fast shutdown, Multi Level Port Priority, Over Current Reporting, Over Temp Reporting, Port remapping, Programmable PCUT, Programmable Port Power Limiting, SRAM Programmable
Number of PSE ports	8
Rating	Catalog