STMicroelectronics STEVAL-ISA023V1

Overview

STEVAL-ISA023V1 from STMicroelectronics is a flyback AC-DC evaluation board based on the VIPer53-E integrated high-voltage PWM controller + MDmesh™ MOSFET, delivering 3.3 V, 5 V, and 12 V positive outputs at up to 24 W total power, with <1 W standby consumption and EN55022 Class B EMI compliance, designed for industrial and white goods SMPS development.

For engineers reviewing the STEVAL-ISA023V1 datasheet, STEVAL-ISA023V1 pinout, STEVAL-ISA023V1 application, or STEVAL-ISA023V1 equivalent, this board provides validated reference design, input voltage range (90–265 V_rms), multi-output regulation, safety certification (EN 60950), and rapid prototyping capability for low-cost AC-DC converters.

Technical Context

The board implements a primary-side regulated flyback topology using the VIPer53-E, which integrates a current-mode PWM controller and 530 V MDmesh™ MOSFET in DIP-8 package, enabling transformer-isolated DC output without optocoupler feedback. It supports universal AC input and delivers three independently wound secondary outputs.

Control is achieved via internal oscillator (60 kHz typical), built-in soft-start, overvoltage protection (OVP), and thermal shutdown. Output regulation relies on auxiliary winding sensing and internal reference, eliminating need for external TL431 or optocoupler circuits.

Key Specifications

Availability

STEVAL-ISA023V1 is available at Aetrix Electronics and suitable for industrial power supply validation, white goods auxiliary power design, and embedded control system prototyping requiring stable component supply and pre-certified reference implementation.

Supply support for STEVAL-ISA023V1 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 MEMS sensors for industrial, automotive, and consumer markets.

This board belongs to ST's STEVAL (ST Evaluation) series-engineered to accelerate time-to-prototype for power conversion, motor control, and sensor interface applications using ST's proprietary ICs and system-level expertise.

FAQ

What is the primary topology implemented on STEVAL-ISA023V1?

The board uses a primary-side regulated flyback converter topology with the VIPer53-E IC. It eliminates the need for optocoupler-based feedback by deriving regulation signals from an auxiliary winding, reducing component count and improving reliability while maintaining tight output voltage tolerance across all three rails.

Does STEVAL-ISA023V1 support adjustable output voltages?

No-output voltages are fixed at 3.3 V, 5 V, and 12 V by transformer turns ratio and internal feedback resistor network. Adjustments require hardware modification of secondary windings or feedback dividers, which voids pre-validated EMI and safety performance.

Can STEVAL-ISA023V1 be used for medical-grade power supplies?

No-it is certified to EN 60950 (IT/industrial equipment), not EN 60601-1. Medical applications require reinforced isolation, lower leakage current, and specific creepage/clearance that exceed this board's design scope and safety documentation.

Is the VIPer53-E IC socketed or soldered on STEVAL-ISA023V1?

The VIPer53-E is permanently soldered in a DIP-8 footprint. The board does not include a socket; replacement requires desoldering and rework. No alternative controller ICs are supported due to pinout and internal feature dependencies (e.g., integrated HV start-up, OVP threshold).