STMicroelectronics STEVAL-ILL020V1

Overview

STEVAL-ILL020V1 from STMicroelectronics is an LCD panel backlight demonstration board built around the LED7706 monolithic boost converter and six-channel constant-current LED driver IC. It supports 4.5–36 V input, delivers up to 36 V output, drives up to 10 white LEDs per row at 30 mA max per channel, features ±2.0% current matching, and enables PWM dimming down to 1% duty cycle at 20 kHz for LCD backlighting in industrial and consumer displays.

For engineers reviewing the STEVAL-ILL020V1 datasheet, STEVAL-ILL020V1 pinout, STEVAL-ILL020V1 application, or STEVAL-ILL020V1 equivalent, this board provides validated reference design implementation of the LED7706 for high-efficiency, fault-aware LCD backlight systems with programmable dimming, OVP, thermal shutdown, and LED open/short detection.

Technical Context

The board implements a peak-current-mode controlled boost converter with adjustable 200 kHz–1 MHz switching frequency, internal 5 V LDO supply, and single-ceramic-output-capacitor topology. It integrates six independent current-sink channels, each programmable up to 30 mA with <500 ns minimum dimming pulse width and row disable capability.

Fault management includes real-time open-circuit and short-circuit LED detection per row, non-latched thermal shutdown, internal MOSFET overcurrent protection, and programmable output overvoltage protection - all coordinated through the LED7706's integrated control logic without external microcontroller intervention.

Key Specifications

Availability

STEVAL-ILL020V1 is available at Aetrix Electronics and suitable for LCD backlight evaluation, display module prototyping, and industrial HMI development requiring stable component supply, rapid proof-of-concept validation, and production-ready reference design reuse.

Supply support for STEVAL-ILL020V1 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, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The STEVAL-ILL020V1 belongs to ST's LED lighting evaluation platform family, developed to accelerate adoption of its LED driver ICs in display backlighting, signage, and architectural lighting applications with turnkey hardware and documented design practices.

FAQ

What is the primary function of the STEVAL-ILL020V1?

The STEVAL-ILL020V1 is a fully assembled demonstration board that implements the LED7706 IC to drive LCD panel backlights using six independently controlled constant-current LED strings. It validates the IC's boost conversion, PWM dimming, current matching, and fault detection capabilities in a production-relevant layout with test points and configuration jumpers.

Does the board support analog dimming or only PWM?

The STEVAL-ILL020V1 supports only PWM dimming via its dedicated DIM input, compatible with standard 20 kHz microcontroller-generated signals. Analog dimming (DC current adjustment) is not implemented - current regulation is fixed per row by external sense resistors, and brightness control relies exclusively on PWM duty-cycle modulation as specified in the LED7706 datasheet.

Can unused LED rows be left unconnected safely?

Yes - the LED7706 IC allows individual rows to be disabled via dedicated ENx pins, and the STEVAL-ILL020V1 provides jumper-selectable enable control for each of the six rows. When disabled, the corresponding current sink is turned off, and the associated LED string terminals are effectively floating with no leakage or bias path, meeting safe "unused row" requirements per design brief.

Is the 36 V output voltage rail isolated from the input?

No - the STEVAL-ILL020V1 uses a non-isolated boost topology; the output shares a common ground with the input. The 36 V output is referenced to the same GND net as the 4.5–36 V input supply. Isolation is not provided, and the board is intended for low-side grounded LED configurations typical in LCD backlight designs.