STMicroelectronics STEVAL-VP12201F

Overview

STEVAL-VP12201F from STMicroelectronics is an evaluation board implementing a 12 V / 5 W isolated flyback converter using the VIPer122LS offline high-voltage converter IC, featuring embedded 730 V Power MOSFET and current-mode PWM control, designed for auxiliary power supply in industrial and consumer equipment operating from 85–265 VAC at 50–60 Hz.

For engineers reviewing the STEVAL-VP12201F datasheet, STEVAL-VP12201F pinout, STEVAL-VP12201F application, or STEVAL-VP12201F equivalent, key selection criteria include standby consumption (<30 mW at 230 VAC), average efficiency (>77%), conducted EMI compliance (IEC55022 Class B), burst-mode operation, and fixed 60 kHz switching with frequency jittering.

Technical Context

The board implements a primary-side regulated, transformer-isolated flyback topology centered on the VIPer122LS - a monolithic high-voltage converter integrating 730 V avalanche-rated MOSFET, oscillator, current-sense amplifier, and PWM controller. It operates in discontinuous conduction mode (DCM) with burst-mode control under light/no-load conditions.

EMI suppression relies on frequency jittering (spreading the 60 kHz fundamental across a narrow band), enabling IEC55022 Class B compliance with minimal external filter components. Regulation is achieved via optocoupler feedback to the VIPer122LS CONTROL pin, with internal error amplifier reference set by TS432 shunt regulator.

Key Specifications

Availability

STEVAL-VP12201F is available at Aetrix Electronics and suitable for industrial auxiliary power supplies, smart metering subsystems, and IoT gateway power rails requiring stable component supply, low-noise isolation, and regulatory-compliant EMI performance.

Supply support for STEVAL-VP12201F 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 ICs, analog chips, and silicon solutions for automotive, industrial, and consumer markets.

This evaluation board belongs to ST's VIPerPlus family reference design portfolio, developed to accelerate adoption of highly integrated, high-voltage AC-DC converters for compact, low-BOM, energy-efficient auxiliary power supplies.

FAQ

What is the primary function of the STEVAL-VP12201F evaluation board?

The STEVAL-VP12201F is a fully assembled and tested 12 V / 5 W isolated flyback evaluation board. Its primary function is to demonstrate and validate the VIPer122LS high-voltage converter IC in real-world auxiliary power supply designs, providing reference schematics, layout, bill-of-materials, and pre-tested performance data including efficiency, standby consumption, and EMI behavior.

Does the board support adjustable output voltage?

No, the STEVAL-VP12201F is configured for fixed 12 V output. Output voltage is set by the resistive divider (R1/R2) feeding the TS432 shunt regulator and optocoupler feedback network. Adjusting R1 or R2 changes the regulation point, but the board is not shipped with user-adjustable potentiometers or jumpers for voltage tuning.

Can this board be used as a production-ready power supply?

While electrically robust and compliant, the STEVAL-VP12201F is intended for evaluation and design prototyping-not certified for end-product use. It lacks safety agency certifications (e.g., UL/EN62368), conformal coating, and production-grade mechanical enclosure. For production, ST recommends designing a derivative based on its reference layout and BOM, then pursuing required safety and EMC certifications.

What is the role of the SFH6106 optocoupler on this board?

The SFH6106 provides secondary-side-to-primary-side feedback isolation. Its phototransistor output connects to the VIPer122LS CONTROL pin, enabling precise regulation of the 12 V output by modulating the duty cycle in response to voltage deviations detected by the TS432 shunt regulator and resistive divider on the secondary side.