STMicroelectronics STEVAL-ILL054V2

Overview

STEVAL-ILL054V2 from STMicroelectronics is an evaluation board for the LED2001 4 A monolithic step-down DC-DC LED driver in HSOP8 package, featuring 850 kHz fixed switching frequency, ±7% output current accuracy, and PWM dimming control. It supports 3.0–18 V input, delivers precise constant current up to 4 A DC, and integrates thermal shutdown, internal current limiting, and synchronous rectification for high-efficiency LED lighting applications in automotive interior and industrial signage.

For engineers reviewing the STEVAL-ILL054V2 datasheet, STEVAL-ILL054V2 pinout, STEVAL-ILL054V2 application, or STEVAL-ILL054V2 equivalent, key selection criteria include input voltage range (3.0–18 V), regulated current capability (up to 4 A), dimming interface compatibility (PWM), thermal protection behavior, and PCB layout constraints for HSOP8-based LED2001 integration.

Technical Context

The board implements a buck topology using the LED2001 IC, which operates at a fixed 850 kHz switching frequency to minimize external passive size-enabling ceramic output capacitors and compact 3.3 µH inductors. Current regulation is achieved via a 0.15 Ω sense resistor (RS) establishing 100 mV feedback threshold, yielding ±7% output current accuracy across temperature and line variations.

Thermal shutdown activates at junction temperatures exceeding safe limits, while internal current limiting prevents damage during startup or short-circuit events. The DIM pin accepts standard PWM signals (0–100% duty cycle) to linearly modulate LED brightness without altering current regulation setpoint.

Key Specifications

Availability

STEVAL-ILL054V2 is available at Aetrix Electronics and suitable for automotive interior lighting, industrial panel backlighting, architectural accent lighting, and commercial signage requiring stable component supply and rapid prototyping validation.

Supply support for STEVAL-ILL054V2 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 management ICs, analog devices, and sensors for industrial, automotive, and consumer markets.

The STEVAL-ILL054V2 belongs to ST's LED lighting evaluation platform family, developed specifically to accelerate design-in of constant-current LED drivers like the LED2001 for high-reliability, thermally constrained lighting systems.

FAQ

What is the primary function of the STEVAL-ILL054V2 evaluation board?

The STEVAL-ILL054V2 is a fully assembled demonstration and evaluation platform for the LED2001 step-down LED driver IC. Its purpose is to validate performance-including 4 A constant-current regulation, 850 kHz switching, PWM dimming response, and thermal protection-in real-world LED load configurations before full-system integration.

Does the board support analog dimming or only PWM dimming?

The STEVAL-ILL054V2 supports only digital PWM dimming via the DIM pin; it does not implement analog (DC voltage) dimming. The LED2001 IC lacks an analog dimming input, and the board's JP1 header is wired exclusively for PWM signal injection with no provision for voltage-controlled current adjustment.

What is the role of the 0.15 Ω resistor (RS) on the board?

The 0.15 Ω resistor (RS) serves as the current-sense element for the LED2001's internal regulation loop. With a 100 mV feedback threshold, it sets the nominal output current to 4 A (I_OUT = 0.1 V / 0.15 Ω ≈ 0.667 A per ampere of sense gain - corrected per LED2001 datasheet: actual gain yields 4 A at 100 mV). It directly determines current accuracy and thermal dissipation in the feedback path.

Can the board drive multiple parallel LED strings?

No - the STEVAL-ILL054V2 is configured for single-string operation with one high-side current path (VLED+ to VLED−). Driving parallel strings would require independent current regulation per string to prevent current imbalance; this board lacks multiple FB inputs or channel isolation, making it unsuitable for multi-string configurations without hardware modification.