STMicroelectronics STEVAL-ISA022V1

Overview

STEVAL-ISA022V1 from STMicroelectronics is a 6 W isolated flyback topology evaluation board based on the VIPer12A-E monolithic offline AC-DC converter IC, delivering regulated 5 V/500 mA and auxiliary 15 V/200 mA outputs across universal 90–264 VAC input at 50/60 Hz - deployed in industrial power supply reference designs and low-power auxiliary supply validation.

For engineers reviewing the STEVAL-ISA022V1 datasheet, STEVAL-ISA022V1 pinout, STEVAL-ISA022V1 application, or STEVAL-ISA022V1 equivalent, this board enables rapid validation of VIPer12A-E-based isolated flyback designs with verified EMI performance, transformer design, and output cross-regulation behavior under discontinuous conduction mode (DCM).

Technical Context

The board implements a DCM flyback converter using the VIPer12A-E IC, which integrates a 60 kHz PWM controller and vertical Power MOSFET in SO-8, eliminating external gate drive and current sense components. Input rectification and filtering precede the primary-side switch, while optocoupler feedback regulates the main 5 V output via secondary-side TL431 shunt regulator.

Transformer T1 provides galvanic isolation and dual-output winding structure; the 15 V auxiliary output is unregulated but stabilized by Zener clamping. No synchronous rectification or active clamp is used - operation relies entirely on passive snubber and diode rectification on both outputs.

Key Specifications

Availability

STEVAL-ISA022V1 is available at Aetrix Electronics and suitable for industrial control power supplies, IoT gateway auxiliary rails, and embedded system isolated bias generation requiring stable component supply and documented reference design validation.

Supply support for STEVAL-ISA022V1 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, sensors, and analog/mixed-signal devices for industrial, automotive, and consumer applications.

This board belongs to ST's STEVAL evaluation platform family, engineered to accelerate prototyping and compliance verification of VIPer-series AC-DC converters in cost-sensitive, space-constrained offline power applications.

FAQ

Is STEVAL-ISA022V1 still in production?

No - STEVAL-ISA022V1 is marked "Obsolete Product(s)" in its official ST documentation (Rev 2, Dec 2007). It remains available through authorized legacy distributors and Aetrix Electronics' extended-life inventory program for design continuity and repair support.

Can STEVAL-ISA022V1 be used with 230 VAC only?

Yes - the board accepts 90–264 VAC input, covering both 115 VAC and 230 VAC mains globally. Its bridge rectifier and bulk capacitor are rated for full-range operation without hardware modification or jumper settings.

Does this board support synchronous rectification?

No - STEVAL-ISA022V1 uses standard silicon diodes (MBR0520 for 5 V, 1N4007 for 15 V) on both outputs. Synchronous rectification is not implemented; efficiency is optimized via DCM operation and VIPer12A-E's integrated MOSFET rather than secondary-side FET control.

What safety certifications does STEVAL-ISA022V1 meet?

The board itself is not certified as a final product, but its layout, transformer creepage/clearance, and VIPer12A-E integration follow IEC 60950-1 requirements for Class II isolated power supplies. Designers must validate full-system certification per end-equipment standards.