TPS23851

更新时间： 2024-11-11 12:16:11

品牌	Logo	应用领域
德州仪器 - TI		控制器以太网
页数	文件大小	规格书
62页	1342K
描述
Quad IEEE 802.3at Power-Over-Ethernet PSE Controller

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TPS23851 数据手册

TPS23851

www.ti.com

SLUSAB3 –SEPTEMBER 2010

Quad IEEE 802.3at Power-Over-Ethernet PSE Controller

Check for Samples: TPS23851

FEATURES

DESCRIPTION

•

INDUSTRY STANDARD PSE

–

Fully IEEE Std 802.3at-2009 Compliant

Four Independent PSE Ports

The TPS23851 is a quad-power controller engineered

to insert power onto Ethernet cable according to IEEE

Std 802.3at-2009 (or 802.3at) for Power Sourcing

Equipment (PSE). The PSE controller can detect

Powered devices (PDs) that have a valid signature,

determine the power requirements of the devices

according to the classification, and apply power to the

devices, limited per 802.3at. Based on an industry

standard register set, the PSE controller is software

compatible with other PSE controllers for basic

functionality

–

PD Detection and Classification

Current Limit Output Protection with

Foldback for Reduced Cost FET

–

AC and DC Disconnect Detection

–

I²C™ Communication

–

4 Bit Address for 64-Port Systems

Flexible Operation Modes

–

Automatic

Beyond the industry standard operation, the

TPS23851 operates with enhanced features. Port

current trip point can be set to all classification

thresholds of IEEE Std 802.3-2005 (or 802.3af) and

can be programmed up to more than 720 mA when

used with a LLDP classification stack, complying with

802.3at. The TPS23851 supports AC and DC

Semi Automatic

Processor Controlled

–

Pin Compatible with LTC4259A &

MAX5952/MAX5945/MAX5935

•

ENHANCED FEATURES

disconnection with

a precision on-chip, 110-Hz

–

Never Fooled 4-Point Detection

oscillator for AC waveform generation. The PSE also

contains four 14-bit A/D converters that constantly

monitor voltage and current on each port. This

information is available on the I²C bus for power

management. The unique converter integrating

topology used in the TPS23851 provides inherent

filtering for a robust solution.

Onboard Precision 110-Hz AC Disconnect

Sine Wave Oscillator

I²C Watchdog for Failsafe Operation

–

Individual and Multiplexed Port Shutdown

Modes

–

Per Port A/D Converters

Typical Application

–

14-Bit Resolution for Precision

Measurements

3.3 V

0.1mF

100 V

–

Real-time Voltage Monitoring

Real-time Current Monitoring

Inherent Filtering

VDD DGND AGND

0.47 mF

1 kW

SCL

SDAO

DET

PORT

10 kW

TPS23851

–

Extended -20°C to 125°C Temperature

Operation

SDAI

INT

OUT

GAT

SEN

802.3at Type 2 Mode

RESET

–

High-Power Mode

VEE

Classification through Link Layer

Discovery Protocol (LLDP)

0.5 W

UDG-10111

Note: Only one port shown.

–

Available in 36-lead SSOP Package

-48 V

APPLICATIONS

•

Ethernet Switches and Routers

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

I²C is a trademark of Royal Philips Electronics.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...62

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与TPS23851相关器件

型号	品牌	获取价格	描述	数据表
TPS23851DCE	TI	获取价格	Quad IEEE 802.3at Power-Over-Ethernet PSE Controller
TPS23851DCER	TI	获取价格	Quad IEEE 802.3at Power-Over-Ethernet PSE Controller
TPS23861	TI	获取价格	具有自主模式的 2 线对、2 类、4 通道 PoE PSE
TPS23861PW	TI	获取价格	具有自主模式的 2 线对、2 类、4 通道 PoE PSE \| PW \| 2
TPS23861PWR	TI	获取价格	具有自主模式的 2 线对、2 类、4 通道 PoE PSE \| PW \| 2
TPS2388	TI	获取价格	2 线对、2 类、8 通道 PoE PSE
TPS23880	TI	获取价格	具有可编程 SRAM 的 4 线对、4 类、8 通道 PoE PSE
TPS23880RTQR	TI	获取价格	具有可编程 SRAM 的 4 线对、4 类、8 通道 PoE PSE \| R
TPS23880RTQT	TI	获取价格	具有可编程 SRAM 的 4 线对、4 类、8 通道 PoE PSE \| R
TPS23881	TI	获取价格	具有 200mΩ RSENSE 的 4 线对、4 类、8 通道 PoE PSE

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