STMicroelectronics STEVAL-ISA013V1

Overview

STEVAL-ISA013V1 from STMicroelectronics is an off-line dual-output AC/DC evaluation board based on the VIPer53 high-voltage PWM controller, delivering 12V @ 1A and 5V @ 2.4A (24W peak) from 85–264Vac input. It implements secondary-side optocoupler feedback with TL431 reference, 100kHz current-mode switching, and meets EN55022 Class B EMI and Blue Angel standby efficiency requirements.

For engineers reviewing the STEVAL-ISA013V1 datasheet, STEVAL-ISA013V1 schematic, STEVAL-ISA013V1 application, or STEVAL-ISA013V1 alternative evaluation boards, this page provides verified board-level specifications, transformer-configurable output options (5V/12V, 5V/15V, 5V/24V), thermal/short-circuit protection behavior, and OEM supply support details.

Technical Context

The board operates in discontinuous conduction mode (DCM) with fixed 100kHz switching frequency set by R3 (3kΩ) and C5 (4.7nF). Input rectification uses KBP210GDI bridge and 68μF/400V bulk capacitor; primary-side control is handled entirely by VIPer53DIP in DIP-8 package with integrated 700V avalanche-rated MOSFET and current-sense circuitry.

Secondary regulation employs LTV817 optocoupler and TL431A shunt regulator with precision 2.49kΩ resistive divider (R6/R9), enabling ±1% 5V output tolerance. Standby power consumption is <1W in burst mode, achieved via auxiliary winding bias and VIPer53's undervoltage lockout with hysteresis.

Key Specifications

Availability

STEVAL-ISA013V1 is available at Aetrix Electronics and suitable for industrial power supply validation, medical auxiliary power design, and consumer AC/DC adapter prototyping requiring stable component supply and documented safety-compliant reference implementation.

Supply support for STEVAL-ISA013V1 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, Switzerland, designing and manufacturing microcontrollers, analog ICs, power devices, and silicon solutions for industrial, automotive, and consumer applications.

This board belongs to ST's STEVAL (ST Evaluation) series-engineered to accelerate power supply design verification using ST's proprietary VIPer and SMPS controller families, with emphasis on safety-certified, EMI-compliant, and thermally robust offline topologies.

FAQ

What is the maximum continuous output power of STEVAL-ISA013V1?

The board delivers up to 24W peak power with both outputs loaded simultaneously ([email protected] + 12V@1A). Continuous operation at full rating requires adequate heatsinking for VIPer53DIP and proper airflow; derating applies above 40°C ambient per ST Application Note AN2392.

Can output voltages be modified beyond 5V/12V?

Yes-application note AN2392 documents how to reconfigure for 5V/15V or 5V/24V by replacing transformer TX1 and adjusting feedback resistors (R6/R9) and output capacitors (C8/C18). Cramer Coil offers pre-qualified variants matching ST's layout constraints and safety spacing.

Does STEVAL-ISA013V1 support primary-side sensing?

No-it uses secondary-side regulation exclusively via LTV817 optocoupler and TL431A. Primary-side sensing is not implemented; the VIPer53 operates in standard opto-feedback mode, requiring isolated feedback path and transformer auxiliary winding for Vdd.

Is STEVAL-ISA013V1 still in active production?

ST has marked STEVAL-ISA013V1 as obsolete per its official product status database (as of 2023), but Aetrix Electronics maintains legacy inventory and provides full documentation, schematic, BOM, and engineering support for ongoing maintenance and redesign projects.