STMicroelectronics STEVAL-ISS001V1

Overview

STEVAL-ISS001V1 from STMicroelectronics is a line-interactive 450 W / 700 VA uninterruptible power supply (UPS) reference design for 120 V / 60 Hz mains, featuring AVR boost/buck regulation, quasi-sine inverter output, RS-232/USB interface, and microcontroller-based system monitoring and control.

For engineers reviewing the STEVAL-ISS001V1 datasheet, STEVAL-ISS001V1 pinout, STEVAL-ISS001V1 application, or STEVAL-ISS001V1 equivalent, this board supports rapid evaluation of AC input conditioning, battery-backed DC-AC conversion, real-time UPS status reporting via PC software, and dual-stage battery charging architecture.

Technical Context

The design implements an off-line topology with automatic voltage regulation (AVR) using transformer-based boost and buck stages to maintain stable output voltage across 83–153 Vac input range. The inverter uses a push-pull DC-DC stage followed by a full-bridge DC-AC stage to generate a quasi-sine waveform at 96–138 Vac ±3 Vac.

A dedicated microcontroller monitors input/output voltage, phase, battery voltage (12 V × 2), output current, and power in real time, enabling precise transfer switching (Class 3 per EN 62040-3), two-step battery recharge, and coordinated relay control for bypass, inverter, and charger modes.

Key Specifications

Availability

STEVAL-ISS001V1 is available at Aetrix Electronics and suitable for embedded UPS development, industrial backup power validation, and PC/server protection systems requiring stable component supply and documented reference implementation.

Supply support for STEVAL-ISS001V1 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 devices, and reference platforms for industrial, automotive, and consumer applications.

This board belongs to ST's STEVAL (ST Evaluation) series - purpose-built reference designs that demonstrate complete system-level implementations of power conversion, energy management, and intelligent control architectures.

FAQ

What is the primary function of the STEVAL-ISS001V1?

The STEVAL-ISS001V1 is a fully assembled, tested line-interactive UPS reference design delivering 450 W / 700 VA output. It integrates AVR regulation, battery charging, DC-AC inversion, and microcontroller-based supervision - intended for engineers to evaluate, adapt, and accelerate development of commercial-grade UPS systems.

Does STEVAL-ISS001V1 support pure sine wave output?

No. The inverter generates a quasi-sine (stepped square) waveform, not a pure sine wave. This output meets requirements for switch-mode power supplies and digital electronics but is unsuitable for inductive loads like motors, transformers, or audio amplifiers requiring low harmonic distortion.

Can the battery configuration be modified?

Yes - the board is designed for two 12 V SLA batteries in series (24 V nominal bus). While the hardware supports alternative 12 V × 2 configurations, changing battery capacity (e.g., >7.2 Ah) requires verification of charger current limits, thermal performance, and microcontroller ADC scaling for accurate state-of-charge estimation.

Is firmware source code provided with the board?

No. ST provides schematic, PCB layout, BOM, and user manual for STEVAL-ISS001V1, but the microcontroller firmware is delivered as a pre-programmed binary only. No C source code, IDE project files, or bootloader documentation are included in the standard package.