原标题：Microsemi PD70211高达95W室内外PoE解决方案

　　Microsemi公司的PD70211是集成了开关稳压器的以太网供电的PD控制器,支持IEEE802.3af, IEEE802at, HDBaseT和通用2/4线配置.其前端包括先进的分类区块,支持2/3/4/6级分类;PWM电流模式部分支持同步反激和有源钳位前向拓扑以及降压和升压等.主要用在室内外PoE.本文介绍了PD70211主要特性,功能框图和典型应用框图,以及评估板PD70211EVB72FW-12主要特性,框图,电路图,材料清单和PCB设计图.

　　PD70211 is an advanced PD Interface IC with integrated switching (PWM) regulator control for Powered Devices in PoE applications. It supports IEEE802.3af, IEEE802at, HDBaseT and general 2/4-pair configurations.

　　The PD70211 front-end includes an advanced classification block that supports 2, 3, 4, and 6 event classification. Using the SUPP_Sx pins, it also identifies which of the four pairs of the cable actually receives power and generates appropriate flags.

　　The IC features an internal bleeder for discharging the input capacitor of the DC/DC converter rapidly, so as to ensure fast re-detection and port power-up in case of sudden removal and re-insertion of the Ethernet cable into the RJ-45. The advanced PWM current-mode section supports synchronous Flyback and Active clamp Forward topologies, as well as Buck, Boost etc.

　　PD70211主要特性:

　　Supports IEEE802.3af/at, HDBaseT and other 2- pair/4-pair configurations

　　Wall-adapter support (Rear Aux method)

　　PD detection & programmable classification

　　2,3,4, and 6 event classification

　　Integrated 0.3Ω isolating (series-pass) FET

　　Inrush current limiting

　　Less than 10μA offset current during detection

　　Advanced PWM section

　　Lead-free MLPQ-36 (6×6 mm) package

　　PD70211应用:

　　HDBaseT up to 95 Watts

　　IEEE802.3af and 802.3at

　　Power Forwarding

　　Indoor and outdoor PoE

　　图1.PD70211框图(前端部分)

　　评估板PD70211EVB72FW-12

　　Microsemi’s PD70211EVB72FW-12 Evaluation Board provides designers with an environment needed for evaluating the performance and implementation of PD applications based on PD70211 controller.

　　The board is using a single PD controller, PD70211ILQ, to support the Detection, Class, and Power Supplying phases on the 4 Pairs of the Cat5 cable. The board supports sync detection of the 4 pairs. PD70211ILQ supports the current of the HDBaseT over 4 Pairs, which is more than twice the power of a standard IEEE802.3AT Type 2 interface.

　　图4.评估板PD70211EVB72FW-12框图

　　图5.评估板PD70211EVB72FW-12外形图

　　评估板PD70211EVB72FW-12主要特性:

　　 Designed to support Data and Spare current by a single PD70211A device

　　 Power is supplied through the 4-pairs of the Cat5 cable

　　 Wall Adapter input–Standard Barrel Jack available for connecting to an external 48-54V Wall Adapter.

　　 Data pass-through connector

　　 On board PSE class type LED indicators

　　 On board AT detected LED indicator

　　 On board 4P_AT detected LED indicator

　　 On board HD detected LED indicator

　　 On board 4P_HD detected LED indicator

　　 On board Power Good LED indicator which may be configured to monitor PD Front End or VPP UVLO.

　　 Ta: -40°to +70℃ (with derating curve)

　　 RoHS compliant

　　评估板PD70211EVB72FW-12材料清单: