PM8800中文资料符合IEEE 802.3af标准的集成PoE-PD接口和PWM控制器，支持外部源数据手册ST规格书

描述 Description

The PM8800A integrates a standard power over Ethernet (PoE) interface and a current mode PWM controller to simplify the design of the power supply sections of all powered devices.

The PoE interface incorporates all the functions required by the IEEE 802.3af including detection, classification, under-voltage lockout (UVLO) and in-rush current limitation.

PM8800A specifically targets PD with extended power requirement with respect to the limit imposed by the 802.3af standard, embedding a hot-swap MOSFET capable of sustaining twice the current of the 802.3af standard with a programmable DC current limit.

The integrated switching regulator has been designed to work with power either form the Ethernet cable connection or from an external power source such as AC adapter.

The DC-DC section of the PM8800A features a programmable oscillator frequency, soft-start, slope compensation and embeds a voltage output error amplifier allowing use in both isolated and non isolated configuration.

特性 Features

• Current mode pulse width modulator
• Thermal shutdown protection
• Programmable soft-start
• Programmable oscillator frequency
• 80% maximum duty cycle with internal slope compensation
• Power good indication
• Supports both isolated and non-isolated applications.
• Programmable DCcurrent limit up to 800 mA
• Programmable classification current
• IEEE 802.3af compliant PD interface
• Integrated 100V, 0. 5Ω, 800mA Hot-Swap MOSFET
• Works with power supplied from Ethernet LAN cables or from local auxiliary sources
• Programmable in-rush current limit
• High voltage start-up bias regulator
• Integrated signature resistor

简介

PM8800属于集成电路（IC）的以太网供电（PoE）控制器。由制造生产的PM8800以太网供电（PoE）控制器以太网供电 (PoE) 控制器允许设计人员通过单个以太网连接传输电流和数据。远程设备通过以太网电缆供电，因此无需电池、本地电源适配器和其他电源电缆。桥式整流器和 N+1 O-Ring 是两种 PoE 控制器类型。可用特性可能包括 N 和 P 沟道 FET、内部开关和汽车认证。