STMicroelectronics STEVAL-ISA142V1

Overview

STEVAL-ISA142V1 from STMicroelectronics is an evaluation board implementing a 50 W, wide-input (90–265 VAC), active power factor correction (PFC) flyback converter using the L6564 controller IC. It delivers regulated 24 V output with ≥0.9 power factor at ≥50% load, ≥88% full-load efficiency, and meets EN55022 Class-B conducted EMI requirements.

For engineers reviewing the STEVAL-ISA142V1 datasheet, STEVAL-ISA142V1 schematic, STEVAL-ISA142V1 application notes, or STEVAL-ISA142V1 bill of materials, this board serves as a validated reference design for cost-sensitive, high-PF LED drivers and low-power industrial AC/DC supplies requiring rapid prototyping and compliance validation.

Technical Context

The board implements a continuous conduction mode (CCM) boost PFC front-end followed by a flyback DC/DC stage, both controlled by the L6564 - a transition-mode PFC controller with integrated zero-current detection and gate driver. The design targets universal AC input and maintains tight output regulation across line and load variations.

Key implementation choices include single-sided CEM-1 PCB (140 × 60 mm), 140 V reflected voltage design to optimize MOSFET stress, and passive EMI filtering meeting Class-B limits without additional shielding. Ambient operating temperature is rated up to 50 °C with natural convection cooling.

Key Specifications

Availability

STEVAL-ISA142V1 is available at Aetrix Electronics and suitable for LED lighting drivers, industrial auxiliary power supplies, and smart building control units requiring stable component supply, reference-grade validation, and fast time-to-test.

Supply support for STEVAL-ISA142V1 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, analog ICs, power management devices, and silicon solutions for industrial, automotive, and consumer markets.

This evaluation board belongs to ST's STEVAL (ST Evaluation) series, developed specifically to accelerate design-in of ST's analog and power ICs - here demonstrating the L6564 in high-PF, cost-optimized flyback applications.

FAQ

Is STEVAL-ISA142V1 RoHS compliant?

Yes. The board is fully RoHS compliant per Directive 2011/65/EU, with lead-free soldering and halogen-free PCB material (CEM-1). All components listed in the BOM meet RoHS requirements, and compliance is documented in ST's official declaration referenced in DocID025413 Rev 1.

Can STEVAL-ISA142V1 operate with 115 VAC input only?

Yes - it is designed for universal input (90–265 VAC, 47–63 Hz), so it operates reliably at 115 VAC. Performance metrics including power factor (≥0.9), efficiency (≥88%), and output regulation remain valid across the full range, as verified in the test report section of the data brief.

Does the board include safety isolation between primary and secondary sides?

Yes. The flyback transformer provides reinforced insulation per IEC 61558-2-16, with creepage/clearance distances validated for 230 VAC mains. Primary-to-secondary isolation voltage is rated at 3 kV AC for 1 minute, and Y-capacitor placement complies with Class I appliance requirements.

What documentation accompanies STEVAL-ISA142V1?

The board ships with the official ST data brief (DocID025413 Rev 1), including full schematic (Figure 1), BOM, PCB layout, test results, and EMI measurement plots. No separate user manual is provided - design guidance is embedded in the data brief's description and feature table.