TPS23881 具有 200mΩ RSENSE 的高功率、8 通道、以太网供电 PSE | 德州仪器 TI.com.cn

TPS23881 (预发布) 具有 200mΩ RSENSE 的高功率、8 通道、以太网供电 PSE

 

More Information and Sample Availability

Product advisory and SRAM firmware update is available.  Request now

Samples are available (PTPS23881RTQT). Request now

Samples are available (PTPS23881ARTQT). Request now

描述

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, determine the power requirements of the devices according to their classification, and apply power.

The TPS23881 improves on the TPS23880 with reduced current sense resistors, more accurate programable power limiting, capacitance measurement, and the ability to operate from ROM (see Device Comparison Table). The TPS23881 is also compatible with TI’s 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 I2C to ensure 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. 

特性

  • IEEE 802.bt PSE solution for PoE applications
  • Eight independent PSE channels
  • Resistor selectable Autonomous operation
  • 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- and 3-Bit fast port shutdown input
  • Auto-class discovery and power measurement
  • Inrush and operational foldback protection
  • Port re-mapping
  • 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)

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参数

与其它产品相比 电源设备 邮件 下载到电子表格中
Part number 立即下单 Vin (Min) (V) Vin (Max) (V) ICUT ILIM PoE standards supported FET MPS method Pair control Operating temperature range (C) Number of PSE ports Features Package Group Package size: mm2:W x L (PKG)
TPS23881 立即下单 44     57       Programmable     802.3at Type 1 (802.3af)
802.3at Type 2
802.3bt Type 3
802.3bt Type 4    
External     DC Disconnect     2-Pair Alt A
4-Pair    
-40 to 125     8     Auto Mode
Autonomous Mode
Current Limit with Foldback
Fast shutdown
Multi Level Port Priority
Over Current Reporting
Over Temp Reporting
Port remapping
Programmable Port Power Limiting
SRAM Programmable    
QFN | 56     56QFN: 64 mm2: 8 x 8 (QFN | 56)    
TPS23861 立即下单 44     57     Programmable     Programmable     802.3at Type 1 (802.3af)
802.3at Type 2    
External     DC Disconnect     2-Pair Alt A     -40 to 125     4     Autonomous Mode
Current Limit with Foldback
Fast shutdown
Over Current Reporting
Over Temp Reporting    
TSSOP | 28     28TSSOP: 62 mm2: 6.4 x 9.7 (TSSOP | 28)    
TPS2388 立即下单 44     57     Programmable     Programmable     802.3at Type 1 (802.3af)
802.3at Type 2    
External     DC Disconnect     2-Pair Alt A     -40 to 125     8     Current Limit with Foldback
Fast shutdown
Multi Level Port Priority
Over Current Reporting
Over Temp Reporting
Port remapping    
QFN | 56     56QFN: 64 mm2: 8 x 8 (QFN | 56)    
TPS23880 立即下单 44     57       Programmable     802.3at Type 1 (802.3af)
802.3at Type 2
802.3bt Type 3
802.3bt Type 4    
External     DC Disconnect     2-Pair Alt A
4-Pair    
-40 to 125     8     Auto Mode
Current Limit with Foldback
Fast shutdown
Multi Level Port Priority
Over Current Reporting
Over Temp Reporting
Port remapping
Programmable Port Power Limiting
SRAM Programmable    
QFN | 56     56QFN: 64 mm2: 8 x 8 (QFN | 56)