[原创] Linear LTC4279单端口以太网(PoE)供电设备控制方案

Linear公司的LTC4279是自主单端口以太网(PoE)供电设备控制器,适用于IEEE 802.3at Type 1, Type 2和LTPoE++兼容的以太网(PoE)供电系统.不需要MCU就能完全自主进行IEEE 802.3和LTPoE++兼容的操作.仅需要单元和一些无源元件就能实现供电设备(PSE),支持LTPoE++高达90W功率,支持2线和4线输出功率.主要用在PoE PSE端点(交换机/路由器),PoE中跨电源,电源转送,飞蜂窝(Femto Cell)以及安全系统.本文介绍了LTC4279主要特性,框图和以太网供电(PoE)系统框图,多种应用电路,以及演示板DC2541A主要特性,电路图和材料清单,PCB设计图.

The LTCR4279 is an autonomous single port power sourcing equipment (PSE) controller designed for use in IEEE 802.3at Type 1, Type 2 and LTPoE++ compliant Power over Ethernet (PoE) systems. The LTC4279 provides fully autonomous IEEE 802.3 and LTPoE++ compliant operation without a microcontroller. The LTC4279 simplifies PSE implementation, requiring only a single supply and a small number of passive support components.

The LTC4279 delivers lowest-in-industry heat dissipation by utilizing a low-RDS(ON) external MOSFET and a 0.1Ω sense resistor, eliminating the need for expensive heat sinks and increasing efficiency.

PD discovery uses a proprietary dual-mode 4-point detection mechanism ensuring excellent immunity from false PD detection. Midspan PSEs are supported with physical..

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