红水杯

Customized high-performance Class 2 powered devices (PDs) to support Class 3 designs

Overview

This reference design is for a highly ecient, yback 3.3V and 5V Class 2 powered device (PD) that is IEEE 802.3af/at complaint and cost-effective. The reference designcan be customized to a 3.3V/2A and 5V/1A Class 3 PD.

The design features the MAX5969B and MAX5974A. The MAX5969B controller is fully compliant with the IEEE 802.3af/at standard in a power-over-Ethernet (PoE) system.The device can also get power from a wall adapter (WAD). The MAX5974A provides both control for wide-input-voltage, active-clamped, inductive feedback, current-modePWM converters and frequency foldback for PoE applications. Using these devices, this reference design is IEEE 802.3af/at compliant. It is also a high-performance, compact, and cost-effective solution for a Class 2 PD or a Class 3 PD.

Documentation

Application Note

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2025-06-24 20:35:39

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