STMicroelectronics STEVAL-ILL001V1

Overview

STEVAL-ILL001V1 from STMicroelectronics is an evaluation board implementing a dimmable flyback LED driver using the VIPer22A-E controller, delivering 350 mA constant current across 3.5–28 V output for 1–8 high-brightness 1 W LEDs, compliant with EN55015:2000 EMI standard and supporting DALI interface via dedicated connector.

For engineers reviewing the STEVAL-ILL001V1 datasheet, STEVAL-ILL001V1 pinout, STEVAL-ILL001V1 application, or STEVAL-ILL001V1 equivalent, key selection considerations include input voltage range selectability (85–135 VAC or 185–265 VAC), open-load output voltage limit (32 V), dimming range (0–90%), and compatibility with VIPer22A-E-based design reuse.

Technical Context

The board implements a primary-side regulated flyback topology with VIPer22A-E integrating 730 V avalanche-rated MOSFET and PWM controller, enabling transformer-isolated constant-current output without secondary-side feedback components. Control relies on internal current-sense and V_REF-based duty-cycle modulation for LED brightness adjustment.

DALI connectivity is provided through J3 (4-pin connector), enabling digital addressable lighting interface compliance per IEC 62386-102. Input voltage range selection is implemented via jumper JP1, configuring either direct AC input or voltage-doubler mode for U.S. mains operation.

Key Specifications

Availability

STEVAL-ILL001V1 is available at Aetrix Electronics and suitable for landscape lighting, street lighting, and architectural lighting requiring stable component supply, rapid prototyping validation, and DALI-compliant driver reference implementation.

Supply support for STEVAL-ILL001V1 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 evaluation board belongs to ST's STEVAL lighting solutions portfolio, developed to accelerate adoption of energy-efficient, digitally controllable LED drivers based on proprietary VIPer high-voltage converters.

FAQ

Does STEVAL-ILL001V1 support analog (0–10 V) dimming in addition to DALI?

No. The board implements only DALI-compliant digital dimming via J3 connector and associated control logic. Analog dimming is not supported - no 0–10 V input circuitry, op-amps, or reference voltage nodes are present on the schematic or bill of materials.

Can the output current be adjusted to 700 mA for higher-power LED strings?

No. Output current is fixed at 350 mA by R23 (0.56 Ω sense resistor) and VIPer22A-E internal current-limit threshold. Modifying R23 alters regulation accuracy and voids EN55015 compliance; no alternate resistor values or jumpers for current scaling are provided.

Is the VIPer22A-E mounted directly on the STEVAL-ILL001V1 board?

Yes. IC1 on the schematic is the VIPer22A-E in DIP-8 package, soldered to the primary-side PCB area near transformer L1 and startup resistor network. Its DRAIN, SOURCE, VDD, and CONTROL pins are fully routed per ST's recommended layout for flyback stability and EMI suppression.

What is the maximum number of 1 W LEDs this board can drive in series?

Eight 1 W LEDs - confirmed by ST's description stating "capable of driving a 1 to 8 LED array" under 185–265 VAC input. At typical 3.2–3.6 V forward voltage per LED, 8×3.5 V = 28 V matches the nominal output upper limit, leaving margin for line and temperature variation.