STMicroelectronics STEVAL-ILL037V1

Overview

STEVAL-ILL037V1 from STMicroelectronics is a demonstration board built around the HVLED805 offline LED driver IC, implementing a quasi-resonant ZVS flyback topology for AC-input LED lamps. It delivers 3.2 W (16 Vdc / 200 mA) output across 3–5 series LEDs, supports universal AC input (90–265 Vac, 50/60 Hz), achieves ~85% efficiency, and targets E26/E27/GU10 lamp form factors.

For engineers reviewing the STEVAL-ILL037V1 datasheet, STEVAL-ILL037V1 pinout, STEVAL-ILL037V1 application, or STEVAL-ILL037V1 equivalent, this board serves as a validated reference design for evaluating HVLED805-based constant-current LED drivers in retrofit lamp and low-power mains-connected lighting applications.

Technical Context

The board implements an all-primary-sensing quasi-resonant flyback converter, eliminating secondary-side feedback components and enabling compact, cost-effective LED lamp designs. The HVLED805 integrates high-voltage startup, current-mode control, and zero-voltage switching logic to minimize switching losses at light-to-full load.

It operates without optocouplers or auxiliary windings, relying on primary-side sensing of reflected output voltage and peak primary current to regulate LED current. Input rectification, bulk capacitance, transformer, MOSFET, and snubber network are fully populated on the PCB for immediate functional evaluation.

Key Specifications

Availability

STEVAL-ILL037V1 is available at Aetrix Electronics and suitable for LED lamp retrofit development, GU10 spotlight qualification, and E27 bulb reference design validation requiring stable component supply and documented performance data.

Supply support for STEVAL-ILL037V1 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, power ICs, sensors, and analog products for industrial, automotive, and consumer markets.

This board belongs to ST's STEVAL illumination evaluation platform family, developed specifically to accelerate adoption of their HVLED-series offline LED drivers in cost-sensitive, space-constrained mains-powered lighting applications.

FAQ

What is the primary purpose of the STEVAL-ILL037V1 board?

The STEVAL-ILL037V1 is a fully assembled demonstration board intended for evaluating the HVLED805 LED driver IC in real-world AC-input lamp applications. It provides measurable electrical performance-3.2 W output, 200 mA constant current, and 85% efficiency-enabling rapid prototyping of E26/E27/GU10-compatible LED retrofit solutions without custom layout or component selection.

Does the board include safety certifications or isolation testing data?

No. The STEVAL-ILL037V1 is a development tool-not a certified end-product-and lacks UL, CE, or IEC safety markings. Its transformer provides basic functional isolation, but users must perform full safety, EMC, and thermal validation per regional standards (e.g., IEC 62384, EN 61347) before commercial deployment.

Can the output current be adjusted, and if so, how?

Yes. Output current is set by the value of the primary-sense resistor (R_CS) connected to the HVLED805's CS pin. The board uses a fixed resistor to achieve 200 mA; changing R_CS recalculates peak primary current and thus LED current per the HVLED805's internal 0.22 V current-sense threshold and transformer turns ratio.

Is the HVLED805 IC accessible for replacement or rework on this board?

Yes. The HVLED805 is mounted in an SO-8 package and soldered to the board with standard footprint and pad layout. It can be desoldered and replaced using standard hot-air rework tools, allowing engineers to test alternate versions or validate custom firmware (if applicable) while retaining the proven passive component network and transformer.