STMicroelectronics STEVAL-ILL005V1

Overview

STEVAL-ILL005V1 from STMicroelectronics is an evaluation board based on the VIPer12A-E off-line constant-current LED driver IC, designed to drive 1–4 high-intensity LEDs in series from universal AC mains (90–264 VAC, 50/60 Hz), delivering selectable output currents of 350 mA, 700 mA, or 1.05 A with up to 6 W total output power.

For engineers reviewing the STEVAL-ILL005V1 datasheet, STEVAL-ILL005V1 pinout, STEVAL-ILL005V1 application, or STEVAL-ILL005V1 equivalent, this board serves as a validated reference design for low-cost, high-efficiency LED lighting systems requiring EMI compliance (EN55022 Class B), adjustable current scaling, and direct AC-to-constant-current conversion without secondary-side feedback.

Technical Context

The board implements a flyback converter topology using the VIPer12A-E - an integrated high-voltage PWM controller + 730 V avalanche-rated MOSFET - operating in quasi-resonant mode to improve efficiency and reduce EMI. It uses primary-side sensing via auxiliary winding feedback, eliminating optocouplers and TL431-based secondary regulation.

Current selection is achieved via jumper configuration (J2/J3) and resistor networks (R12/R13/R14) that set the sense voltage threshold at the VIPer12A-E's current-sense pin (pin 1). Output rectification employs STTH102 and STTH152 fast recovery diodes, while EMI filtering includes a 45 mH common-mode choke (L1) and X/Y-capacitor network (C1, C2, C6, C11).

Key Specifications

Availability

STEVAL-ILL005V1 is available at Aetrix Electronics and suitable for LED streetlighting prototypes, architectural accent lighting, emergency exit signage, and industrial panel indicator systems requiring stable component supply and rapid validation of constant-current AC/DC driver performance.

Supply support for STEVAL-ILL005V1 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, specializing in power management, microcontrollers, analog ICs, and automotive-grade silicon.

This board belongs to ST's STEVAL (ST Evaluation) family - purpose-built reference designs that demonstrate real-world implementation of ST's power ICs, targeting rapid prototyping and compliance-ready LED driver development.

FAQ

What is the maximum number of LEDs the STEVAL-ILL005V1 can drive?

The board drives up to four high-intensity LEDs connected in series, verified with forward voltages ranging from 3.0 V to 3.6 V per LED at 350 mA. At higher output currents (700 mA or 1.05 A), the practical limit reduces to three LEDs due to thermal and voltage headroom constraints across the VIPer12A-E's 730 V breakdown rating and transformer turns ratio.

Does STEVAL-ILL005V1 include isolation between input and output?

Yes - it provides reinforced galvanic isolation via a custom-wound flyback transformer (not explicitly labeled but implemented in schematic Figure 1), meeting basic insulation requirements per IEC 61347-2-13. Input-to-output creepage/clearance exceeds 6 mm, and the design passes EN55022 Class B conducted/radiated emissions testing under isolated conditions.

Can the output current be adjusted beyond the three factory-set values?

No - current levels are fixed by discrete resistor networks (R12, R13, R14) and jumper positions (J2/J3); no onboard potentiometer or digital interface exists for continuous adjustment. To change output current, users must replace sense resistors per VIPer12A-E datasheet equations and revalidate safety and thermal performance.

Is a heatsink required for the VIPer12A-E during operation?

Yes - the VIPer12A-E (U4) is mounted directly on the PCB copper pour acting as its primary heatsink. The board layout allocates ≥10 cm² of 2 oz copper connected to pin 5 (Source) and pins 6–8 (Drain) for thermal dissipation. No external heatsink is needed at ≤6 W output under free-air convection at 25°C ambient.