PM8801中文资料PoE-PD interface & PWM controller数据手册ST规格书

描述 Description

The PM8801 integrates a standard compliant 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/PoE+ interface incorporates all the functions required by the IEEE 802.3at including detection, classification, undervoltage lockout (UVLO) and inrush current limitation.
The PM8801 specifically performs IEEE802.3at Layer1 hardware classification, providing an indication of type 2 PSE successful detection to the rest of the system.
The PM8801 has been designed to work with power either from the Ethernet cable connection or from an external power source such as a wall adapter, ensuring prevalence of the auxiliary source with respect to the PoE interface.
The DC/DC section of the PM8801 features a programmable oscillator frequency, an adjustable slope compensation, dual complementary low-side drivers with programmable delay time and internal temperature sensor.
The PM8801 targets high-efficiency conversion at all load conditions supporting flyback, forward, forward active clamp and synchronous rectification.

特性 Features

• IEEE 802.3at compliant PD interface
• Works with power supplied from Ethernet LAN cables or from local auxiliary sources
• Successful IEEE802.3at Layer1 classification indicator
• Integrated 100 V, 0.45 Ω, 1 A hot-swap MOSFET
• Accurate 140 mA typ. inrush current level
• Programmable classification current
• Sleep mode with LED indicator and Maintain Power Signature (MPS)
• Precise DC current limit set at 640 mA typ.
• Integrated high-voltage startup bias regulator
• Thermal shutdown protection
• Current mode pulse width modulator
• Programmable oscillator frequency
• 80% maximum duty cycle with internal slope compensation
• Support for flyback, forward, forward active clamp, flyback with synchronous rectification

简介

PM8801属于集成电路（IC）的以太网供电（PoE）控制器。由制造生产的PM8801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。