TI TPS23754 Class 4 PoE电源转换器参考设计

TI公司的TPS23754和TPS23756组合了以太网供电(PoE)用电设备(PD)接口和电流模式DC/DC控制器,PoE接口支持IEEE 802.3at标准,支持高效率的拓朴,功率高达30W,主要用在IEEE 802.3at标准兼容的设备,视频和VoIP电话,RFID读卡器,多波段接如点和安全照相机.本文介绍了TPS23754/6主要特性,框图,典型应用电路,以及Class 4 PoE电源转换器参考设计主要特性,电路图,材料清单和PCB设计图.

The TPS23754 and TPS23756 devices have a combined power-over-ethernet (PoE) powered-device (PD) interface and current-mode DC/DC controller optimized specifically for isolated converters. The PoE interface supports the IEEE 802.3at standard.

The TPS23754 and TPS23756 support a number of input voltage ORing options including highest voltage, external adapter preference, and PoE preference. These features allow the designer to determine which power source will carry the load under all conditions.

The PoE interface features the new extended hardware classification necessary for compatibility with high-power midspan power sourcing equipment (PSE) per IEEE 802.3at. The detection signature pin can also be used to force power from the PoE source off. Classification can be programmed to any of the defined types with a single resistor.
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