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Evaluation Board, PoE PD Converter, PM8804, PM8805, 5V, 8A Output


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Technical Datasheet:
STEVAL-POE002V1   Datasheet
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Product Overview

5V/8A, synchronous flyback converter, Power over Ethernet (PoE) IEEE 802.3bt compliant reference design. This reference design is a two-stage converter for a powered device (PD) and is able to deliver up to 40W (5V/8A) DC from appropriate 4-pair PoE power sourcing equipment (PSE) or an external auxiliary supply. The first stage is the Ethernet interface is based on the PM8805 controller with integrated full active bridge rectification. The PoE controller is compliant with the third generation IEEE 802.3bt specification (as well as the preceding 802.3af/at standards) with improved features and increased power capacity that allow new application possibilities for PoE networks including point of sales and retail logistics devices. The second stage is the DC-DC converter designed around a fixed frequency flyback topology managed by the configurable PM8804 PWM controller with secondary synchronous rectification via a gate driver transformer.
  • Works with power supplied from Ethernet LAN cables or local auxiliary sources
  • Line input voltage range from 40 to 60VDC
  • Output stage managed by configurable PM8804 controller
  • Output voltage of 5VDC ±2.5%, output current of 8A
  • Peak-to-peak output ripple of 50mV
  • DC-DC full load efficiency of 91%
  • Overall full load efficiency of 90%
  • Transient response ΔV pk-pk 100% to 50% load step is 700mV
  • Switching frequency of 280KHz


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