Silabs Si3406x系列以太网供电+(PoE+)解决方案

Silabs公司的Si3406x系列是符合IEEE 802.3要求的全集成式PoE+ PD 接口和带晶体管旁路以及睡眠,唤醒和 LED 驱动器的高效率开关稳压器,集成了以太网供电+（PoE+）型供电设备(PD) 应用中所需的所有电源管理和控制功能,完全支持 IEEE 802.3at 规范,能够进行单个或两个事件分类.主要用在 IP 语音电话,无线接入点,安保和监察 IP 摄像机,照明设备,销售点终端机,以太网设备和网络设备.本文介绍了Si3406x系列主要特性,框图,应用电路以及评估板Si34061ISOC4-KIT主要特性,电路图,材料清单和PCB设计图.
The Si3406x family integrates all power management and control functions required ina Power-over-Ethernet Plus (PoE+) powered device (PD) application. These devicesconvert the high voltage supplied over the 10／100／1000BASE-T Ethernet connection toa regulated, low-voltage output supply. The optimized architecture of this device familyminimizes the solution footprint and external BOM cost and enables the use of low-cost
external components while maintaining high performance. The Si3406x family integrates the required diode bridges and transient surge suppressor, thus enabling directconnection of the IC to the Ethernet RJ-45 connector. The switching power FET and all associated functions are also integrated. The integrated, current mode controlledswitching regulator supports isolated or non-isolated flyback and buck converter topologies.
The switching frequency for the regulator is tunable with a simple external resistorvalue to help avoid unwanted harmonics for better emissions control. A synchronousdriver is provided to optionally drive a secondary side FET to improve efficiency of powerconversion. Connection to the PSE switch is maintained during sleep by an optional automated maintain-power-signature (MPS) signal.
These devices fully support the IEEE 802.3at specification for the cases of single ortwo event classification. Standard external resistors provide the proper IEEE 802.3 signatures for the detection function and programming of the classification mode, and internalstartup circuits ensure well-c...