STMicroelectronics STEVAL-TSP003V2

Overview

STEVAL-TSP003V2 from STMicroelectronics is a Power over Ethernet (PoE) Powered Device (PD) demonstration board based on the PM8800A IC, implementing an isolated flyback converter compliant with IEEE 802.3af. It delivers 12 V ±5% at up to 1 A from 40–60 V_DC PoE input or auxiliary sources, achieves >88% DC-DC full-load efficiency, and supports dual-input source selection (AUX I/AUX II) for flexible power architecture integration in low-power networked devices.

For engineers reviewing the STEVAL-TSP003V2 datasheet, STEVAL-TSP003V2 pinout, STEVAL-TSP003V2 application, or STEVAL-TSP003V2 equivalent, this reference design provides validated implementation guidance for IEEE 802.3af-compliant PD interface integration, auxiliary source prioritization logic, transient response validation (<200 mV_pp under 50% load step), and flyback topology layout with diode rectification and thermal management considerations.

Technical Context

The STEVAL-TSP003V2 implements a single-output, isolated flyback converter using the PM8800A - an integrated PoE-PD interface + PWM controller. It supports both PoE-only and hybrid (PoE + auxiliary) operation, with AUX II configured for auxiliary source precedence and AUX I enabling wall-adaptor use below PoE UVLO threshold while retaining inrush/DC current limiting.

Key functional blocks include IEEE 802.3af signature detection and classification circuitry, active current limiting, under-voltage lockout (UVLO), PWM-controlled primary-side switching, secondary-side synchronous or diode rectification (as implemented), and output voltage regulation via optocoupler feedback. Transient response is optimized for <200 mV_pp output deviation during 50% load steps.

Key Specifications

Availability

STEVAL-TSP003V2 is available at Aetrix Electronics and suitable for PoE-powered IP surveillance systems, industrial IoT gateways, smart building controllers, and networked audio endpoints requiring stable component supply and rapid prototyping validation.

Supply support for STEVAL-TSP003V2 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, Switzerland, designing and manufacturing microcontrollers, analog ICs, power management devices, and embedded solutions for industrial, automotive, and consumer markets.

The STEVAL-TSP003V2 belongs to ST's Power over Ethernet evaluation platform family, developed to accelerate adoption of IEEE 802.3af-compliant powered device designs with minimal external components and validated thermal and EMI performance.

FAQ

What is the role of the PM8800A IC on the STEVAL-TSP003V2 board?

The PM8800A serves as the core integrated PoE-PD interface and PWM controller. It handles IEEE 802.3af signature detection, classification, inrush current limiting, under-voltage lockout, and primary-side flyback regulation - eliminating need for discrete PD front-end and separate controller ICs.

Can STEVAL-TSP003V2 operate without PoE power?

Yes. The board accepts auxiliary power via two dedicated connectors: AUX I supports wall adapters below the PoE UVLO threshold (e.g., 12–24 V) with retained current limiting, while AUX II enables full precedence - bypassing PoE entirely when active.

Does STEVAL-TSP003V2 support IEEE 802.3at (PoE+) or 802.3bt?

No. It is strictly IEEE 802.3af (Class 0–3, up to 15.4 W) compliant. The PM8800A does not support higher-power classification signatures, extended voltage ranges, or multi-event classification required for 802.3at/bt.

What output rectification method is used on this board?

The STEVAL-TSP003V2 uses diode rectification on the secondary side of the flyback transformer, as confirmed by the schematic (D2, D3 Schottky diodes) and application note AN4319 - optimized for cost-sensitive, low-noise 12 V/1 A PoE endpoints.