STMicroelectronics STEVAL-VP26K02F

Overview

STEVAL-VP26K02F from STMicroelectronics is an evaluation board implementing a double-output isolated secondary-side regulated (SSR) flyback converter, built around the VIPER267KDTR high-voltage offline controller. It delivers 12 V at 0.7 Arms (1 A peak) and 6 V at 200 mA, supports 85–500 VAC single-phase or 50–290 VAC three-phase input, and meets EN55022/EN61000 EMC standards for smart meter and PLC power supply applications.

For engineers reviewing the STEVAL-VP26K02F datasheet, STEVAL-VP26K02F pinout, STEVAL-VP26K02F application, or STEVAL-VP26K02F equivalent, key selection considerations include dual-output SSR regulation, 1050 V avalanche-rugged VIPER267KDTR integration, 60 kHz jittered PWM for EMI reduction, 78% full-load efficiency, and WEEE/RoHS compliance for utility-grade metering designs.

Technical Context

The board implements a transformer-isolated flyback topology with optocoupler-based secondary-side feedback (SFH610A-2), enabling precise output voltage regulation independent of line and load variations. The VIPER267KDTR integrates a 1050 V avalanche-rated power MOSFET, fixed 700 mA current limit, on-chip soft-start, and auto-restart protection.

Input stage includes X/Y capacitors (C7, C8), common-mode chokes (L1–L4), and MOVs (VR1–VR4) for robust surge immunity per EN61000-4-4/5/6. Output filtering uses low-ESR electrolytics (C5, C13, C14, C22) and Schottky diodes (STPS1150A, STPS2200U) to sustain 12 V/0.7 Arms and 6 V/200 mA under wide AC input range.

Key Specifications

Availability

STEVAL-VP26K02F is available at Aetrix Electronics and suitable for smart meter design validation, PLC system power architecture prototyping, and utility-grade isolated DC-DC converter qualification requiring stable component supply and regulatory-compliant reference hardware.

Supply support for STEVAL-VP26K02F 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, power ICs, sensors, and analog/mixed-signal solutions for industrial, automotive, and smart infrastructure markets.

This board belongs to ST's STEVAL evaluation platform family, engineered to accelerate development of certified, high-reliability power supplies for utility metering, grid-edge IoT, and industrial automation systems.

FAQ

What is the primary function of the STEVAL-VP26K02F evaluation board?

The STEVAL-VP26K02F is a fully assembled, tested reference design for a dual-output isolated SSR flyback converter. It demonstrates the VIPER267KDTR controller in a production-ready configuration delivering regulated 12 V and 6 V outputs from universal AC mains, specifically targeting smart meter and PLC auxiliary power supply requirements.

Does the board support both single-phase and three-phase AC inputs?

Yes - it operates across 85–500 VAC for single-phase connections and 50–290 VAC for three-phase configurations. Input stage components (MOVs, chokes, X/Y caps) are rated for these ranges and comply with EN61000-4-5 surge immunity up to 4 kV line-to-ground.

How is secondary-side regulation implemented on this board?

Regulation uses an SFH610A-2 optocoupler feeding the VIPER267KDTR's COMP pin, with TL432ILT shunt regulator on the 6 V output winding side. This closed-loop SSR architecture maintains tight output tolerance (<±8%) across line, load, and temperature without primary-side sensing components.

Can the STEVAL-VP26K02F be used for certification testing?

Yes - it has been pre-tested for EN55022 radiated/conducted emissions and EN61000-4-4/5/6 immunity. Its layout, BOM, and transformer (Würth 750316631) are optimized for EMC performance, making it suitable as a baseline for formal utility meter certification per IEC 62053 and EN 13757.