IEEE 802.3af/At-Biddable PSE Controller Saves Gap and Cost in Poe+ Mechanical Plans

The MAX5971B integrates a 0.5ohm power MOSFET, intellect resistor, and recent monitor to keep space and cost in PSE system the distinctive function circuit requires less than eight outer components. Additionally, the MAX5971B includes a 9-bit ADC and I2C boundary to facilitate advanced control management and power budgeting. Capable of delivering up to 40 W/port for PoE+ powered devices (PDs), the MAX5971B is well suited for IP phones, IP cameras, wireless LAN access points, and video surveillance cameras.

This PSE controller is wholly compliant to the IEEE 802.3af and IEEE 802.3at standards. The tool operates from 32 V to 60 V and provides IEEE 802.3af/at-compliant PD discovery, classification, and DC/AC load-detach detection. Class 5 and two-incident classification are supported for exposure and classification of high-power PDs. The MAX5971B also detect legacy PDs that use elevated capacitance as the discovery signature.

The device is totally software configurable through its I2C-compatible, 2-wire serial interface. The MAX5971B can be controlled with a system microcontroller it can be configured to activate autonomously without the necessitate for a host microcontroller or software; or it can be configured to drive in manual or semiautomatic modes, which offer design flexibility as well as field debug and diagnostic capabilities.