STMicroelectronics STEVAL-ISA103V1

Overview

STEVAL-ISA103V1 from STMicroelectronics is a demonstration board implementing an auxiliary switched-mode power supply based on the VIPER27LN high-voltage converter IC, delivering 5 V at up to 12 W across 90–265 V_AC input. It features very low standby consumption, brownout protection, and ENERGY STAR® compliance for consumer electronics standby power applications.

For engineers reviewing the STEVAL-ISA103V1 datasheet, STEVAL-ISA103V1 application notes, STEVAL-ISA103V1 schematic, or STEVAL-ISA103V1 alternative evaluation boards, this page provides verified functional context, key design specifications, availability status, manufacturer background, and targeted selection guidance for auxiliary SMPS development in TV, set-top box, and desktop PC platforms.

Technical Context

The board implements a flyback topology with primary-side regulation using the VIPER27LN, eliminating the need for an optocoupler or secondary-side feedback circuit. Input voltage range spans universal AC (90–265 V_AC) and supports full-load operation up to 12 W at 5 V output.

Standby power is minimized via adaptive burst-mode control and integrated high-voltage startup circuitry. Protection features include output overvoltage, secondary winding short-circuit, overload, and brownout detection - all implemented within the VIPER27LN and supporting discrete components.

Key Specifications

Availability

STEVAL-ISA103V1 is available at Aetrix Electronics and suitable for LCD/Plasma TV auxiliary power design, set-top box standby supply validation, and desktop PC auxiliary rail prototyping requiring stable component supply and documented reference implementation.

Supply support for STEVAL-ISA103V1 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 markets.

This board belongs to ST's STEVAL (ST Evaluation) series - purpose-built reference designs that demonstrate application-specific implementations of ST's power, interface, and control ICs for rapid prototyping and compliance validation.

FAQ

Is STEVAL-ISA103V1 a production-ready power supply module?

No. It is a demonstration board intended for evaluation and design reference only. It includes test points, jumpers, and layout features optimized for measurement and configuration - not for direct integration into mass-produced end equipment without redesign and safety certification.

Does STEVAL-ISA103V1 require external feedback components?

No. The VIPER27LN uses primary-side sensing and internal regulation, eliminating optocouplers and TL431-based secondary feedback networks. Output voltage accuracy relies on transformer turns ratio and internal reference tolerance (±5% typical).

Can STEVAL-ISA103V1 be used for 12 V output instead of 5 V?

No. The board is fixed at 5 V output by transformer design, output rectification, and feedback resistor network. Changing output voltage requires transformer rewinding, rectifier diode replacement, and feedback divider recalibration - not supported by the existing PCB layout.

What safety certifications does STEVAL-ISA103V1 hold?

The board itself is not certified to UL/EN 60950 or IEC 62368. It is a development tool; final product certification must be performed on the end-system incorporating appropriate isolation, creepage/clearance, and enclosure design per regional safety standards.