High-Performance Class 2 Powered Device (PD) is Customizable for Class 3 Designs

© Mar 16, 2011, Maxim Integrated Products, Inc.

Abstract: This reference design is for a highly efficient, flyback 3.3V and 5V Class 2 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 frequency foldback for PoE applications. Using these devices, this reference design is IEEE® 802.3af/at compliant, and a high-performance, compact, and cost efficient solution for a Class 2 PD. The design can also be customized to 3.3V/2A and 5V/1A Class 3 PD.

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Download, PDF FormatREFERENCE SCHEMATIC 4940: High-Performance Class 2 Powered Device (PD) is Customizable for Class 3 Designs (PDF, 461kB)

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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 4940: Mar 16, 2011
REFERENCE SCHEMATIC 4940, AN4940, AN 4940, APP4940, Appnote4940, Appnote 4940