STMicroelectronics STEVAL-TSP009V2

Overview

STEVAL-TSP009V2 from STMicroelectronics is a reference design for an IEEE 802.3at-compliant Power over Ethernet (PoE+) powered device interface, implementing a synchronous flyback converter delivering 3.35 VDC ±5% at up to 6 A from 40–60 VDC PoE or auxiliary input sources. It integrates the PM8803 controller with active clamp support, diode/synchronous rectification options, and configurable input bridge topologies.

For engineers reviewing the STEVAL-TSP009V2 datasheet, STEVAL-TSP009V2 application, STEVAL-TSP009V2 schematic, or STEVAL-TSP009V2 alternative, this reference design provides validated implementation guidance for high-efficiency PoE+ power conversion in industrial IoT gateways, IP cameras, and VoIP endpoints requiring stable 3.3 V/6 A isolated DC-DC output with <25 mV ripple and >90% full-load efficiency.

Technical Context

The STEVAL-TSP009V2 implements a continuous conduction mode (CCM) isolated flyback topology with synchronous rectification driven by transformer-coupled gate signals. It supports dual-input operation-primary PoE+ (40–60 VDC) and auxiliary sources via AUX I (low-voltage wall adapter) or AUX II (priority override)-with automatic source selection logic.

Core control is handled by the PM8803 IC, which embeds IEEE 802.3at PD interface (detection, classification, under-voltage lockout), PWM controller, and auxiliary-source management. The design includes optional 4-pair PSE detection, active bridge support, primary-side snubber variants (including active clamp), and multiple transformer size options for gate-driven or self-driven configurations.

Key Specifications

Availability

STEVAL-TSP009V2 is available at Aetrix Electronics and suitable for industrial IoT gateways, IP surveillance cameras, and VoIP telephony endpoints requiring stable component supply, rapid prototyping validation, and production-ready PoE+ power architecture.

Supply support for STEVAL-TSP009V2 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 microcontrollers, power management ICs, sensors, and analog products for automotive, industrial, and consumer applications.

The STEVAL-TSP009V2 belongs to ST's Power Over Ethernet reference design portfolio, developed to accelerate adoption of IEEE 802.3at-compliant power delivery in space-constrained, thermally sensitive edge devices requiring high-efficiency isolated DC-DC conversion.

FAQ

What is the primary function of the STEVAL-TSP009V2?

The STEVAL-TSP009V2 is a complete reference design board-not an IC-that implements a 3.35 V/6 A synchronous flyback converter compliant with IEEE 802.3at (PoE+). It demonstrates the PM8803 controller in a production-ready layout with configurable input bridges, auxiliary source integration, and multiple rectification and snubber options for rapid evaluation and design reuse.

Can the STEVAL-TSP009V2 operate without PoE input?

Yes. The board supports dual-input operation: it accepts power from standard 40–60 VDC PoE+ sources or local auxiliary supplies via two dedicated connectors (AUX I and AUX II). AUX II gives priority to auxiliary input over PoE, while AUX I allows use of lower-voltage wall adapters below the PoE UVLO threshold, retaining inrush and DC current limiting functions.

Does the STEVAL-TSP009V2 include PSE detection capability?

Yes. The design includes an optional 4-pair detection circuit that identifies high-power PSE sources compliant with IEEE 802.3at Type 2, enabling appropriate classification and power negotiation before enabling the DC-DC stage. This feature is implemented using discrete components and jumpers per the DB2574 schematic.

What topologies does the STEVAL-TSP009V2 support beyond basic flyback?

The board supports multiple isolated topologies through configuration: self-driven or transformer-gate-driven flyback, forward with active clamp, and selectable primary-side snubbers (RCD, Zener-clamp, or active clamp). Transformer options include three sizes for gate-driven and two for self-driven implementations, allowing optimization for efficiency, EMI, or board area.