STMicroelectronics STEVAL-ILL055V1

Overview

STEVAL-ILL055V1 from STMicroelectronics is an isolated LED driver evaluation board based on the HVLED815PF monolithic flyback controller with integrated 800 V avalanche-rugged MOSFET. It delivers 640 mA constant current to drive up to six white or blue LEDs, achieving 11 W output power, >0.9 power factor, and 84% efficiency across 185–264 Vac / 45–55 Hz input. It targets cost-sensitive, space-constrained offline LED lighting designs.

For engineers reviewing the STEVAL-ILL055V1 datasheet, STEVAL-ILL055V1 pinout, STEVAL-ILL055V1 application, or STEVAL-ILL055V1 equivalent, this page provides verified technical context, isolation compliance (2 kV / 4 mm), EN55022 Class B EMI performance, PCB layout details (FR4, double-layer, 35 µm copper), and functional mapping of the HVLED815PF IC on the board.

Technical Context

The STEVAL-ILL055V1 implements a high-power-factor flyback topology using the HVLED815PF, which integrates primary-side regulation, 800 V MOSFET, and PWM control in one SO-16 package. It operates in quasi-resonant mode to reduce switching losses and EMI.

Input rectification and filtering feed a transformer-coupled flyback stage with optocoupler-free secondary-side current sensing via the ILED pin. The board achieves galvanic isolation (2 kV RMS, 4 mm creepage) and meets EN55022 Class B conducted/radiated emission limits without external shielding.

Key Specifications

Availability

STEVAL-ILL055V1 is available at Aetrix Electronics and suitable for LED streetlight retrofit kits, industrial panel indicators, architectural accent lighting, and commercial downlight modules requiring stable component supply and pre-validated safety-compliant topology.

Supply support for STEVAL-ILL055V1 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 devices for industrial, automotive, and consumer applications.

This board belongs to ST's STEVAL (ST Evaluation) family-engineered to accelerate prototyping and validation of LED driver topologies using ST's proprietary HVLED and VIPer controllers, targeting energy-efficient, certified, and production-ready lighting solutions.

FAQ

What is the maximum number of LEDs the STEVAL-ILL055V1 can drive?

The board is configured to drive up to six white or blue LEDs in series, assuming typical forward voltage of ~3.5 V per LED (total VF ≈ 21 V), delivering 640 mA constant current. Output voltage headroom is limited by the 11 W power budget and transformer turns ratio; exceeding six LEDs risks undercurrent or regulation loss.

Does the STEVAL-ILL055V1 support dimming functionality?

No-this evaluation board implements fixed-output constant-current operation only, with no provision for analog dimming, PWM dimming, or digital interface. Dimming requires external circuitry or redesign using a compatible controller like HVLED001B with DIM pin support.

Can the STEVAL-ILL055V1 be used with 110 Vac input?

No-it is specifically designed for 185–264 Vac (EU-wide mains range). Operation below 185 Vac causes insufficient VCC startup voltage and unstable regulation; no hardware modification is validated for 110 Vac use.

What safety certifications does the STEVAL-ILL055V1 board meet?

The board itself is not certified as a final product, but its design complies with key requirements for end-product certification: 2 kV isolation (IEC 61347-1 Annex G), 4 mm creepage/clearance (IEC 61347-2-13), and EN55022 Class B emissions. Full luminaire certification requires system-level testing including thermal, mechanical, and enclosure validation.