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您现在的位置: 61IC电子在线 >> TI专栏 >> TI模拟设计 >> 电源管理 >> 正文
  [组图]TPS23861:四端口以太网供电设备控制方案           ★★★ 【字体:
TPS23861:四端口以太网供电设备控制方案
作者:TI    文章来源:TI    点击数:    更新时间:2015-1-4    
TI公司的TPS23861是容易使用的以太网IEEE802.3a供电设备 (PSE)解决方案,不需要外接元件能自动管理四个802.3at端口.可以自动检测受电设备 (PD)和分类,满足IEEE 400-ms TPON 标准,主要用在以太网交换和路由器,住宅区网关,PoE传递系统,无线回传, 监测NVR和DVR等.本文介绍了TPS23861主要特性,框图和功能框图,多种应用电路,以及评估模块TPS23861EVM-612主要特性,电路图,材料清单和PCB元件布局图.

The TPS23861 is an easy-to-use, flexible, IEEE802.3at PSE solution. As shipped, it automatically manages four 802.3at ports without the need for any external control.

The TPS23861 automatically detects Powered Devices (PDs) that have a valid signature, determines power requirements according to classification and applies power. Two-event classification is supported for type-2 PDs. The TPS23861 supports DC disconnection and the external FET architecture allows designers to balance size, efficiency and solution cost requirements.

The unique pin-out enables 2-layer PCB designs via logical grouping and clear upper and lower differentiation of I2C and power pins. This delivers best-in-class thermal performance, Kelvin accuracy and low-build cost.

In addition to automatic operation, the TPS23861 supports semi auto-mode via I2C control for precision monitoring and intelligent power management. Compliance with the 400-ms TPON specification is ensured whether in semi-automatic or automatic mode.

TPS23861主要特性:

IEEE 802.3at Quad Port PSE Controller
Auto Detect, Classification
Auto Turn-On and Disconnect
Efficient 255-mΩ Sense Resistor
Pin-Out Enables Two-Layer PCB
Kelvin Current Sensing
4-Point Detection
Automatic Mode – As Shipped
No External Terminal Setting Required
No Initial I2C Communication Required
Semi-Automatic Mode – Set by I2C Command
Continuous Identification and Classification
Meets IEEE 400-ms TPON Specification
Fast-Port Shutdown Input
Optional I2C Control and Monitoring
–40°C to 125°C Temperature Range
TSSOP28 Package 9.8 mm x 6.6 mm

TPS23861应用:

Ethernet Switches and Routers
Surveillance NVR and DVRs
Residential Gateways
PoE Pass-Through Systems
Wireless Backhaul

图1. TPS23861简化框图

图2. TPS23861功能框图

图3. TPS23861自动四端口工作电路图

图4. TPS23861带端口重置的两端口自动模式应用电路图

图4. TPS23861四端口自动模式应用电路图

图5. TPS23861八端口半自动模式工作电路图

评估模块TPS23861EVM-612

TPS23861EVM-612 Evaluation Module for Quad IEEE 802.3at PoE PSE Controller

This user’s guide describes the evaluation modules (EVM) for the TPS23861 (TPS23861EVM-612). The EVM contains evaluation and reference circuitry for the TPS23861. The TPS23861 is a Power-over-Ethernet (PoE) device for power sourcing equipment (PSE).

The TPS23861EVM-612 features the quad port, TPS23861, IEEE 802.3at PoE PSE controller. The EVM consists of a motherboard (TPS23861EVM-612) and daughter board (TPS23861EVM-613) containing two TPS23861 devices. The TPS23861EVM-612 provides a multi-port base platform interface for TPS23861EVM-613, MSP-EXP430G2 (LaunchPad™), and USB-TO-GPIO (USB Interface Adapter).

评估模块TPS23861EVM-612主要特性:

• TPS23861 PSE devices default to auto-mode operation so no operator interface over I2C is required.
• Four IEEE802.3at, Type 2 (30 W) ports with 1000BASE-T (gigabit Ethernet data pass through)
• Two non-standard, high power ports with 1000BASE-T (gigabit Ethernet data pass through)
• Fully certified using UNH-IOL Clause #33 PSE Conformance Test Suite
• Single DC power supply input
• On board 3.3-V regulator
• On board I2C interface to both TPS23861PW devices from either USB-TO-GPIO or MSP-EXP430G2.
• Port ON status LEDs
• User test points

评估模块TPS23861EVM-612应用:

• Ethernet switches and routers
• Surveillance VDRs
• High power PoE
• PoE pass-through systems
PS23861 PSE controller supporting type 2 and high power-four pair PD loads
图6.评估模块TPS23861EVM-612外形图

图7.评估模块TPS23861EVM-612(主板)电路图:控制

图8.评估模块TPS23861EVM-612(主板)电路图:电源端口

图9.评估模块TPS23861EVM-613(子板)电路图

图10.评估模块TPS23861EVM-612(主板)顶层元件布局图

图11.评估模块TPS23861EVM-612(主板)顶层PCB走线图

图12.评估模块TPS23861EVM-613(子板)顶层元件布局图

图13.评估模块TPS23861EVM-613(子板)底层元件布局图
评估模块TPS23861EVM-612材料清单:


评估模块TPS23861EVM-613材料清单

详情请见:
http://www.ti.com/product/tps23861
http://www.ti.com/lit/ug/sluuay8b/sluuay8b.pdf
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