STMicroelectronics STEVAL-TLL010V1

Overview

STEVAL-TLL010V1 from STMicroelectronics is an evaluation board for the STLA02 white LED driver IC, designed to demonstrate high-efficiency boost-based backlight driving for small displays. It supports input voltages from 2.5 V to 18 V, delivers up to 20 mA total current across 6-series white LEDs, and features 2.3 MHz switching, PWM dimming with 300:1 range, and overvoltage/overtemperature protection - validated in handheld PDA and MP3 player backlight applications.

For engineers reviewing the STEVAL-TLL010V1 datasheet, STEVAL-TLL010V1 pinout, STEVAL-TLL010V1 application, or STEVAL-TLL010V1 equivalent, this page provides verified hardware configuration details, component-level performance data, thermal behavior under load, PCB layout guidance for EMI-sensitive boost converters, and direct PWM dimming implementation notes - all derived from ST's official reference design documentation (Doc ID 010005 Rev 1).

Technical Context

The STEVAL-TLL010V1 implements the STLA02 in a fixed-component, single-layer-optimized configuration using a 10 µH shielded inductor (TDK VLF3012ST-100MR59), 1 µF input/output ceramic capacitors (Murata GRM216R61E105KA12), and a 10 Ω feedback resistor (Tyco CPF0402B10RE) to set 20 mA output current. The board uses high-side current sensing and integrates the EN/PWM pin for direct digital dimming control without external logic.

It operates with a constant 2.3 MHz switching frequency across temperature (±0.1 MHz variation from –40 °C to +85 °C), achieves ≥83% system efficiency at 10 V input / 24 V output / 20 mA load, and maintains output current regulation within ±5% over full input voltage range - confirmed by Figure 11 and Table 7 of the STLA02 datasheet.

Key Specifications

Availability

STEVAL-TLL010V1 is available at Aetrix Electronics and suitable for LCD display backlight validation, portable device power subsystem prototyping, and LED driver qualification requiring stable component supply, traceable sourcing, and documented thermal performance.

Supply support for STEVAL-TLL010V1 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 analog, power, microcontroller, and sensor technologies for industrial, automotive, and consumer markets.

The STEVAL-TLL010V1 belongs to ST's STEVAL evaluation board family, developed specifically to accelerate adoption of its LED driver ICs by providing fully tested, application-ready hardware with complete schematic, layout, and performance characterization data.

FAQ

What is the purpose of the STEVAL-TLL010V1 evaluation board?

The STEVAL-TLL010V1 is a ready-to-use demonstration platform for the STLA02 white LED driver IC. It validates the IC's ability to drive up to six series-connected white LEDs with precise current regulation, high-frequency boost conversion, and direct PWM dimming - targeting display backlight applications in PDAs, cellular phones, and MP3 players as specified in ST's official application note (Doc ID 010005 Rev 1).

Can the STEVAL-TLL010V1 drive more than six LEDs?

No - the board is configured for a maximum of six white LEDs in series, based on the STLA02's 27 V absolute maximum output voltage and 20 mA total current limit. Driving more LEDs would exceed the 24 V typical output requirement (6 × 3.1 V VFLED + 10 mV × 20 mA sense drop), risking overvoltage protection activation or reduced regulation accuracy per the electrical characteristics table.

What external components are included on the STEVAL-TLL010V1 board?

The board includes a 10 µH shielded inductor (TDK VLF3012ST-100MR59), two 1 µF/25 V ceramic capacitors (Murata GRM216R61E105KA12) for input and output filtering, a 10 Ω 0402 feedback resistor (Tyco CPF0402B10RE), and OSRAM LWL283-Q1R2-3K8L-1-Z white LEDs rated for 20 mA/3.1 V - all selected per ST's recommended design values in Section 7.2 of the datasheet.

Does the STEVAL-TLL010V1 support analog dimming?

No - the board implements only direct PWM dimming via the EN pin, as specified in Section 7.1 of the STLA02 datasheet. Analog dimming (e.g., via variable feedback resistor or DAC-controlled bias) is not supported by the fixed RFB value (10 Ω) or board routing; dimming is exclusively achieved by applying a 100 Hz–1 kHz PWM signal with ≥1.8 V amplitude to the EN pin.