Microchip PD70201 PoE IEEE 802.3af/at PD控制器解决方案

Microchip公司的PD70201和PD70101是集成了供电设备(PD)接口和PWM控制器,用于IEEE® 802.3af 和IEEE® 802.3at应用的DC/DC转换器. PD70101用于IEEE 802.3af or IEEE 802.3at Type 1的应用,而PD70201则用于IEEE 802.3at Type 2的应用.单个PD70201器件能用在4对线应用,功耗高达47.7W.这两种器件具有PD检测和可编程的分类特性,集成了0.6 Ω隔离开关和浪涌电流限制器.4对线单个PD70201 IC高达48W,4对线两个PD70201高达96W,在检测时的失调电流小于10μA,单电压DC输入36V-57V,工作温度−40 到 85 °C.器件集成片上热保护,集成的PWM用于100 kHz到 500 kHz 可调DC/DC转换器开关频率能和外部时钟同步.支持低功耗模式以获得更高的效率,50%最大占空比,软起动电路控制输出电压上升时间,PoE端口输入UVLO具有可编阈值和滞后,内部的差分放大器简化了非隔离降压转换器,器件具有过载和短路保护,32引脚5mmx5mm QFN封装, RoHS兼容.主要用在IEEE 802.3at和IEEE 802.3af 供电设备如IP电话,WLAN接入点和网络照相机.本文介绍了PD70201主要特性,基本框图和功能框图,评估板EV96C70A主要特性和框图,电路图,材料清单和PCB设计图.

The PD70101 and PD70201 devices are integrated Powered Device (PD) interface and PWM controllers for a DC-DC converter used in IEEE® 802.3af and IEEE® 802.3at applications. The PD70101 device can be used for IEEE 802.3af or IEEE 802.3at Type 1 applications, while the PD70201 device can also be used in IEEE 802.3at Type 2 applications.

A single PD70201 device can be used in 4-pair applications that consume up to 47.7 W.

These devices have a number of features designed to improve efficiency and reliability:

• Detection and Classification: The front-end interface includes detection and classification circuitry. The detection signature resistor is disconnected upon completion of the detection phase. The system then begins the classification phase. Classification can be configured for Classes 0 to 4 via an external resistor. The PD70201 includes a two-events classification identification circuit, which generates a flag to inform the PD

application whether the Power Source Equipment...