TPS2370
- Integrated Power Interface Switch for IEEE 802.3af Powered Devices (PDs)
- Provides PD Detection Signature
- Provides PD Classification Signature (Class 0-4)
- Programmable Inrush Current Limit
- Internal 0.3- Low-Side FET
- Interfaces to DC/DC Soft-Start for DC/DC Enable
- Internal Thermal Protection — Disconnects PD Load
- Minimal External Parts Count
- 8-Pin SOIC, 8-Pin TSSOP Packages
- APPLICATIONS
- VoIP Phones
- Internet Appliances
- Wireless LAN Access Points
- Bluetooth™ Access Points
PowerPAD is a trademark of Texas Instruments. Bluetooth is a trademark of Telefonaktiebolaget LM Ericsson.
Acting as an interface between the Power Source Equipment (PSE) and the Powered Device (PD), the TPS2370 performs all detection, classification, inrush current limiting, and switch FET control that is necessary for compliance with the IEEE 802.3af Standard. An internal 0.3- FET provides maximum power delivery. As an additional feature, the TPS2370 interfaces with the enable/soft-start signal of a dc-to-dc converter, eliminating the need to have an accurate UVLO in the dc-to-dc converter.
At low-input voltages (1.8 V to 10 V), the TPS2370 draws less than 12 µA, allowing accurate sensing of the external 24.9-k discovery resistor. At input voltages between 15 V and 20 V, an external resistor sets the level of current to be drawn during classification mode. TPS2370 is compatible with current as well as voltage measurement schemes for classification. Above 20-V input, the classification current is shut off, reducing internal power dissipation.
The TPS2370 drives an internal low-side FET for control of the return side of the power path. The internal FET switch is turned on when the input voltage reaches 40 V and above. When the input voltage decreases, the FET remains on until the input voltage drops to below 30 V.
During initial turn-on of the switch (inrush mode), an external resistor is used to program the inrush current, allowing a wide range of capacitor values to be used at the load. According to IEEE 802.3 af specification, inrush current of 400 mA is allowed only for 50 ms, limiting the load capacitor to approximately 180 µF. A programmable inrush current limit removes this limitation, allowing a larger capacitor to be used with a lower inrush current limit.
技术文档
类型 | 标题 | 下载最新的英语版本 | 日期 | |||
---|---|---|---|---|---|---|
* | 数据表 | IEEE 802.3 af for Power Over Ethernet (PoE) Powered Devices 数据表 (Rev. C) | 2004年 3月 3日 | |||
应用手册 | Powered Device Controllers Comparison | 2004年 4月 22日 |
设计和开发
如需其他信息或资源,请点击以下任一标题进入详情页面查看(如有)。
PSPICE-FOR-TI — 适用于 TI 设计和模拟工具的 PSpice®
借助 PSpice for TI 的设计和仿真环境及其内置的模型库,您可对复杂的混合信号设计进行仿真。创建完整的终端设备设计和原型解决方案,然后再进行布局和制造,可缩短产品上市时间并降低开发成本。
在 PSpice for TI 设计和仿真工具中,您可以搜索 TI (...)
封装 | 引脚 | 下载 |
---|---|---|
TSSOP (PW) | 8 | 查看选项 |
订购和质量
- RoHS
- REACH
- 器件标识
- 引脚镀层/焊球材料
- MSL 等级/回流焊峰值温度
- MTBF/时基故障估算
- 材料成分
- 鉴定摘要
- 持续可靠性监测
- 制造厂地点
- 封装厂地点