STMicroelectronics STEVAL-ILL007V1

Overview

STEVAL-ILL007V1 from STMicroelectronics is a reference design board implementing a constant-current LED driver for MR-16 format lamps, based on the L5973D step-down DC-DC controller. It supports 12 VAC, 12 VDC (automotive), and 24 VDC inputs; delivers programmable output current of 350 mA, 700 mA, or 1.05 A; and includes full-wave bridge rectification for AC operation.

For engineers reviewing the STEVAL-ILL007V1 datasheet, STEVAL-ILL007V1 pinout, STEVAL-ILL007V1 application, or STEVAL-ILL007V1 equivalent, this board enables rapid validation of high-intensity LED lighting systems with adjustable current, reverse-battery protection capability, and flexible input voltage configuration across residential, automotive, and commercial low-voltage lighting designs.

Technical Context

The board implements a synchronous buck topology using the L5973D controller IC to regulate LED current via external sense resistors and feedback loop compensation. Input voltage range spans 6–24 VDC or 12 VAC (rectified), with built-in full-wave bridge (D2/D4–D7) enabling direct AC mains compatibility.

Current setting is achieved through jumper-selectable parallel configurations of 0.68 Ω sense resistors (Rs, Rs2, Rs3), yielding precise 350 mA, 700 mA, or 1.05 A output. Reverse battery protection is implemented via discrete PNP transistor Q1 and associated bias network.

Key Specifications

Availability

STEVAL-ILL007V1 is available at Aetrix Electronics and suitable for MR-16 LED retrofit lighting, automotive interior lighting, and low-voltage architectural accent lighting requiring stable component supply and validated reference design implementation.

Supply support for STEVAL-ILL007V1 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 analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer applications.

This board belongs to ST's STEVAL (ST Evaluation) family - reference designs intended to accelerate prototyping and system-level validation of ST's power management and LED driver ICs in real-world lighting applications.

FAQ

What input voltage configurations does STEVAL-ILL007V1 support?

The board accepts 12 VAC (via integrated full-wave bridge), 12 VDC (for automotive use), and 24 VDC. Its input stage operates from 6–24 VDC after rectification, allowing flexibility across residential, vehicle, and commercial low-voltage systems without redesign.

How is output current selected on STEVAL-ILL007V1?

Output current is set by jumpering terminals J2 and/or J4 to configure parallel combinations of 0.68 Ω sense resistors (Rs, Rs2, Rs3). Three discrete settings are supported: 350 mA (single resistor), 700 mA (two in parallel), and 1.05 A (three in parallel).

Does STEVAL-ILL007V1 include reverse battery protection?

Yes - it implements discrete reverse polarity protection using MMBT3906 PNP transistor Q1 and associated bias resistors (R1–R4). This prevents damage during incorrect battery connection in 12 VDC automotive installations.

Can STEVAL-ILL007V1 drive multiple LEDs in series?

Yes - the constant-current architecture supports series-connected LED strings. With up to 1.05 A output and typical forward voltages of 3–4 V per white LED, it can drive up to 6–8 standard high-brightness LEDs depending on input voltage headroom and thermal design.