PD70224中文资料IEEE 802.3at / bt / PoH IdealBridge™ dual MOSFET-bridge rectifier数据手册Microchip规格书

描述 Description

PD70224 is a dual pack of MOSFET-based full-bridge rectifiers. It contains low-Rds 0.16Ω N-channel MOSFETs for much higher overall efficiency and higher output power, particularly when used in Powered Devices (PDs) for PoE applications. The entire drive circuitry for driving the MOSFETs is on-chip, including a charge pump for driving the high-side N-channel MOSFETs. The total forward drop (bridge offset) introduced by the IdealBridge™ rectifier is only 192 mV at 0.6A, compared to a standard bridge rectifier that typically presents 2000 mV of forward drop.PD70224 IdealBridge™ can support over 1A current, making it the ideal choice not only for modern energy-saving 2-pair applications compliant with IEEE 802.3af and IEEE 802.3at (Type 1 and Type 2), but also 4-pair PDs such IEEE 802.3bt and PoH.In addition, PD70224 can help identify at the physical layer itself whether a 2-pair PSE or a 4-pair PSE is providing power over the cable. It does this by sensing the voltage on the line (un-rectified) side of the pairs.

特性 Features

Active circuit with low forward-drop to replace dissipative passive diode bridges
Self-contained drive circuitry for MOSFETs
Designed to support IEEE 802.3af / at / bt and PoH
Integrated 0.16 Ohm N-channel MOSFETs for 0.3 Ohm total path resistance
‘Power-present’ indicator signals for identifying 4-pair bridge power
Low leakage, Wide operating voltage range up to 57V
-40°C to +85°C ambient
40 pins, 6mm x 8mm QFN
MSL3, RoHS compliant

简介

PD70224属于开发板套件编程器的评估演示板及套件。由制造生产的PD70224评估和演示板及套件该系列产品提供了一种方便的方法，在经过验证的实施环境中评估某些重点器件的性能或特性。评估方法通常有完善的文档说明，并且视乎具体情况由评估软件提供支持。产品通常由印刷电路板组成，板上已装有重点器件以及必要或有用的支持元器件，另外也可能包括其他组件，例如电缆或电源。对于数量特别多或类别独特的器件类别(如 ADC、DAC 和开关模式电源)，评估平台可组合为一个单独的产品系列。