PM8805中文资料具有嵌入式双有源桥的IEEE 802.3bt PoE-PD接口数据手册ST规格书

描述 Description

The PM8805 is a system-in-package for smart power supply of Power over Ethernet (PoE) Powered Devices (PD) and it is applicable for power level up to 99.9 W.

It embeds: two active bridges and their driving circuitry, a charge pump to drive the high-side MOSFETs, the hot swap MOSFET and the interface compliant with IEEE 802.3bt.

The device performs the physical layer classification, providing the indication of successful PSE type identification. A 4-pair PSE is identified and the information is available by a dedicated matrix of Tx signals.

The device works with power either from the Ethernet cable or from an external power source such as a wall adapter, with possible prevalence of the auxiliary source with respect to the PoE.

The PM8805 is suitable to build the interface section of PoE switch mode power supplies targeting the highest conversion efficiency. It provides a PGD signal that can be used to enable a PWM controller, a DC-DC converter or an LED driver.

特性 Features

• Dual active bridge, hot swap MOSFET and PoE-PD interface in a system-in-package
• 100 V N-ch MOSFETs with 0.2 Ω total path resistance for each active bridge
• 100 V, 0.1 Ω high-side N-ch hot swap MOSFET
• PoE-PD single-signature interface compliant with IEEE 802.3bt / at / af
• Supports 4-pair PoE applications
• Supports 12 V auxiliary sources
• Identifies which kind of PSE (standard or legacy) is connected with and provides successful IEEE802.3bt / at / af classification indication as a combination of the T0, T1 and T2 signals (open drain)
• Smart operational modes
• Programmable classification current with 3.3 ms delay
• Optional Autoclass feature
• Advanced energy-saving MPS timings
• Two-step hot swap current protection: DC with 1 ms delay and short-circuit with 10 μs delay
• Controlled pre-charge of the output capacitor
• PGD signal (open drain) to enable an external PWM controller
• Thermal shutdown protection

简介

PM8805属于集成电路（IC）的以太网供电（PoE）控制器。由制造生产的PM8805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。