STMicroelectronics STEVAL-ISA001V1

Overview

STEVAL-ISA001V1 from STMicroelectronics is a 6W dual-output offline AC/DC evaluation board based on the VIPer12A high-voltage converter IC, delivering regulated 5V @ 1A and 12V @ 0.5A outputs from 85–264 VAC input, featuring burst-mode operation for <1W standby power, EN55022 Class B EMI compliance, and integrated thermal/short-circuit protection.

For engineers reviewing the STEVAL-ISA001V1 datasheet, STEVAL-ISA001V1 pinout, STEVAL-ISA001V1 application, or STEVAL-ISA001V1 equivalent, this reference design supports rapid validation of VIPer12A-based dual-rail flyback topologies in industrial control, smart metering, and low-power IoT gateways requiring Blue Angel–compliant standby consumption.

Technical Context

The board implements a current-mode controlled flyback converter with primary-side regulation via VIPer12A, using an optocoupler (U2) and TL431 (U3) for secondary-side feedback of the 5V rail. The 12V output is derived from auxiliary winding regulation with passive post-filtering.

Burst-mode operation activates below ~10% load to maintain output regulation while limiting no-load input power to <1W; hiccup-mode protection engages during sustained overvoltage or short-circuit events, with thermal shutdown triggered above 150°C junction temperature.

Key Specifications

Availability

STEVAL-ISA001V1 is available at Aetrix Electronics and suitable for industrial power supply validation, smart energy meter reference designs, and low-power IoT gateway development requiring stable component supply and documented regulatory compliance.

Supply support for STEVAL-ISA001V1 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 automotive, industrial, and consumer applications.

This board belongs to ST's STEVAL (ST Evaluation) series-engineered to accelerate prototyping and compliance verification of ST's proprietary AC/DC and DC/DC converter ICs in real-world power architectures.

FAQ

What is the primary function of STEVAL-ISA001V1?

STEVAL-ISA001V1 is a fully assembled, tested evaluation board for the VIPer12A off-line high-voltage converter IC. Its purpose is to demonstrate a dual-output (5V/12V), 6W flyback power supply architecture meeting Blue Angel and EN55022 Class B requirements, enabling immediate functional and regulatory validation without custom PCB design.

Can output voltages be modified, and how?

Yes-output voltages are adjustable by changing the transformer turns ratio and modifying feedback resistors R7 and R8 on the 5V regulation loop. The board supports alternative configurations like 5V/15V or 5V/24V using readily available transformers, as documented in ST's associated application note AN2197.

Does STEVAL-ISA001V1 include safety certifications?

No-STEVAL-ISA001V1 is an evaluation board intended for lab use and design verification only. It is not certified to UL/IEC/EN safety standards. Users must perform full safety qualification-including creepage/clearance verification, insulation testing, and thermal analysis-on their final end-product implementation.

What protection features are implemented?

The board integrates auxiliary undervoltage lockout (UVLO) with hysteresis, output short-circuit protection with hiccup-mode recovery, and thermal shutdown activated above 150°C. These protections are inherent to the VIPer12A IC and reinforced by discrete components including fuse F2 and snubber network R2/C4.