STMicroelectronics EVALPM8803-FLY

Overview

EVALPM8803-FLY from STMicroelectronics is an IEEE 802.3at-compliant demonstration kit implementing a synchronous flyback PoE+ converter based on the PM8803 controller IC, delivering up to 30 W with selectable 3.3 V or 5 V output, supporting Gigabit Ethernet data pass-through and auxiliary power input prioritization.

For engineers reviewing the EVALPM8803-FLY datasheet, EVALPM8803-FLY pinout, EVALPM8803-FLY application, or EVALPM8803-FLY equivalent, this board enables rapid validation of Power over Ethernet Plus (PoE+) interface design, flyback topology efficiency, auxiliary source arbitration, and IEEE 802.3at Layer 1 classification behavior in real-world infrastructure deployments.

Technical Context

The EVALPM8803-FLY implements a full IEEE 802.3at Type 2 Powered Device (PD) interface with integrated diode bridge, classification circuitry, and synchronous rectified flyback DC/DC conversion. It supports both PoE-powered and auxiliary-powered operation with automatic source precedence governed by the PM8803's internal logic.

Board-level features include dual Ethernet jacks for data pass-through, three status LEDs indicating converter operation, auxiliary input presence, and PSE connection, plus configurable footprints for MOSFETs, transformers, and common-mode chokes to support design iteration and alternative component evaluation.

Key Specifications

Availability

EVALPM8803-FLY is available at Aetrix Electronics and suitable for PoE+ infrastructure testing, Ethernet-powered device prototyping, and IEEE 802.3at compliance verification requiring stable component supply and documented reference design validation.

Supply support for EVALPM8803-FLY includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer applications.

The EVALPM8803-FLY belongs to ST's Power over Ethernet evaluation platform family, developed specifically to accelerate adoption of IEEE 802.3at-compliant powered devices through validated, production-ready reference designs.

FAQ

Does EVALPM8803-FLY support IEEE 802.3af (PoE) as well as 802.3at (PoE+)?

Yes - the board implements full IEEE 802.3at Type 2 compliance and maintains backward compatibility with IEEE 802.3af. Its classification circuitry responds correctly to both AF and AT signature detection sequences, enabling interoperability with legacy and modern PSEs.

Can the output voltage be changed during operation?

No - output voltage selection (3.3 V or 5 V) is determined by resistor divider configuration on the feedback network and must be set before power-up. The board does not support dynamic voltage switching or digital control of VOUT.

Is the Ethernet data path galvanically isolated?

Yes - the board integrates a standard Ethernet data transformer that provides mandatory 1.5 kV RMS isolation between the PHY side and the PoE interface, preserving signal integrity while meeting safety and EMC requirements for Gigabit Ethernet operation.

What is the role of the three status LEDs?

The LEDs indicate: (1) converter operational status (ON/OFF), (2) presence of a valid auxiliary DC input, and (3) successful IEEE 802.3at Layer 1 classification handshake with the PSE - providing immediate visual debug capability during bring-up and field validation.