REFERENCE SCHEMATIC 5044

Low-EMI, Active-Clamped Forward, Class 4 Powered Device (PD) Provides High-Efficiency Solution for PoE Applications

© May 09, 2011, Maxim Integrated Products, Inc.

Abstract: This reference design is for a highly efficient and low-EMI active-clamped forward, 5V powered device (PD). The design features the MAX5969B as its controller. The design also uses the MAX5974A, which controls current-mode PWM converters and provides inductive feedback, zero-voltage switching (ZVS), and frequency foldback to reduce cost and enhance supply efficiency for PoE applications. Using these devices, this reference design is IEEE® 802.3af/at compliant, and is a high-performance, compact, and cost-efficient solution for a Class 4 PD. The design can also support the auxiliary input voltage to provide maximum 25W output power.

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Related Parts
MAX5969B IEEE 802.3af/at-Compliant, Powered Device Interface Controllers with Integrated Power MOSFET Free Samples  
MAX5974A Active-Clamped, Spread-Spectrum, Current-Mode PWM Controllers Free Samples  


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APP 5044: May 09, 2011
REFERENCE SCHEMATIC 5044, AN5044, AN 5044, APP5044, Appnote5044, Appnote 5044