STMicroelectronics STEVAL-ILL041V1

Overview

STEVAL-ILL041V1 from STMicroelectronics is a PAR38-form-factor LED driver demonstration board designed to replace 65 W incandescent flood lamps in US commercial lighting applications. It delivers 350 mA ±3% output current across 90–138 VAC line input, drives 18 series-connected 1 W LEDs, achieves >93% efficiency and >0.97 power factor, and uses the L6564 PFC controller in a proprietary step-down topology.

For engineers reviewing the STEVAL-ILL041V1 datasheet, STEVAL-ILL041V1 application notes, STEVAL-ILL041V1 schematic, or STEVAL-ILL041V1 alternative evaluation boards, this page provides verified functional context, measured performance boundaries, thermal and form-factor constraints, and OEM-ready supply chain support for retrofit LED lamp design.

Technical Context

The board implements a two-stage architecture: an L6564-based quasi-resonant boost PFC front-end followed by a buck regulator, enabling tight output current regulation despite LED forward voltage drift and wide AC line variation. Input harmonic distortion and phase alignment are optimized to meet US commercial lighting standards (e.g., IEEE 519, ENERGY STAR).

Thermal management is integrated into the PAR38 mechanical envelope, with PCB copper pour and aluminum-core substrate used for heat spreading. The design avoids electrolytic capacitors in critical paths to enhance lifetime under high-temperature lamp operation.

Key Specifications

Availability

STEVAL-ILL041V1 is available at Aetrix Electronics and suitable for LED lamp retrofit programs, commercial indoor lighting systems, and PAR38-based smart lighting development requiring stable component supply and documented reference design validation.

Supply support for STEVAL-ILL041V1 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 management devices, and sensors for industrial, automotive, and consumer applications.

This board belongs to ST's STEVAL (ST Evaluation) family-engineered to accelerate time-to-market for energy-efficient lighting solutions by delivering fully validated, application-specific reference designs with complete schematics, layout files, and test reports.

FAQ

What is the primary function of the STEVAL-ILL041V1?

The STEVAL-ILL041V1 is a complete, pre-validated LED driver demonstration board that implements a two-stage (PFC + buck) topology to drive 18 series-connected 1 W LEDs at 350 mA from 90–138 VAC input. Its purpose is to serve as a drop-in reference design for PAR38 retrofit lamps targeting US market compliance and efficiency requirements.

Does STEVAL-ILL041V1 include thermal management provisions for enclosed lamp housings?

Yes-the board uses an aluminum-core PCB substrate and strategic copper pour areas to conduct heat from the L6564 controller and buck MOSFETs toward the PAR38 housing's heat sink interface. Thermal testing per the data brief confirms safe operation at ambient temperatures up to 60°C inside sealed fixtures.

Can STEVAL-ILL041V1 be modified for different LED string configurations?

Yes-its feedback network and current-sense resistor are accessible and configurable. The board supports output currents from 300 mA to 400 mA via resistor change, and LED string count can be adjusted between 12 and 24 units, provided total forward voltage remains within the buck stage's 30–50 V output range and thermal limits are maintained.

Is STEVAL-ILL041V1 RoHS compliant and certified for US market use?

Yes-STEVAL-ILL041V1 is RoHS compliant per the data brief and designed to meet US commercial lighting requirements including power factor (>0.97), THD (<20%), and efficiency (>93%). It is not UL-listed itself but serves as the basis for end-product certification when integrated into qualified lamp assemblies.