STMicroelectronics STEVAL-LLL009V1

Overview

STEVAL-LLL009V1 from STMicroelectronics is a digitally controlled 300 W high-voltage AC-input LED driver evaluation board featuring transition-mode boost PFC, half-bridge LCC resonant DC-DC conversion, and synchronous rectification. It supports configurable constant voltage (48.5 V ±1%) or constant current (6.25 A ±2.5%) output modes, achieves >93.5% peak efficiency, and operates across 275–480 VAC input. It is used for evaluating high-efficiency, digitally managed LED drivers in industrial and outdoor lighting systems.

For engineers reviewing the STEVAL-LLL009V1 datasheet, STEVAL-LLL009V1 pinout, STEVAL-LLL009V1 application, or STEVAL-LLL009V1 equivalent, this page provides verified functional architecture, firmware integration details (STM32F334R8), gate driver configuration (STGAP2D), MOSFET selection rationale (STW20N95DK5/STW20N95K5/STP100N10F7), and dimming interface support (0–10 V analog with 1% resolution).

Technical Context

The board implements a two-stage power architecture: a transition-mode PFC stage driven by L6562AT controlling an STW20N95K5 MDmesh K5 MOSFET, followed by a half-bridge LCC resonant converter using STW20N95DK5 MDmesh DK5 MOSFETs and synchronous rectification via STP100N10F7 STripFET F7 MOSFETs on the secondary side. All control logic-including PFC regulation, LCC timing, SR timing, and protection sequencing-is executed by the STM32F334R8 MCU using HRTIM peripherals and analog comparators.

Digital control enables precise 0–10 V analog dimming in CC mode with 1% resolution, soft-start sequencing, and comprehensive protections including input/output overvoltage/undervoltage, open-load, short-circuit, and thermal monitoring. Auxiliary supply uses VIPER267KDTR for ultra-wide input operation, delivering isolated +3.3 V, +5 V, and +15 V rails to MCU, gate drivers, and signal conditioning circuits.

Key Specifications

Availability

STEVAL-LLL009V1 is available at Aetrix Electronics and suitable for industrial LED lighting design validation, high-voltage AC-input power supply prototyping, and digital power control algorithm development requiring stable component supply and full reference design traceability.

Supply support for STEVAL-LLL009V1 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, designing and manufacturing microcontrollers, power devices, analog ICs, and sensors for automotive, industrial, and consumer markets.

This evaluation board belongs to ST's LED Lighting Solutions product line, engineered to accelerate adoption of digitally controlled, high-efficiency, high-reliability LED drivers compliant with international energy and EMC standards.

FAQ

What firmware is preloaded on the STM32F334R8 MCU?

The board ships with STSW-LLL009FW firmware, a production-ready implementation supporting both CV and CC output modes, 0–10 V analog dimming, real-time protection monitoring (OVP/UVP/OCP/OTP), and communication interfaces including SMBus and CAN. Source code and configuration tools are provided in the official ST package.

Can the output be reconfigured between CV and CC modes after assembly?

Yes-mode selection is implemented via physical SPDT switch SW1 (pins 1–2 for CV, pins 2–3 for CC). No hardware modification or firmware reflash is required; the MCU detects the switch state at boot and configures HRTIM timers, ADC thresholds, and control loops accordingly.

Which MOSFETs are used in the PFC and LCC stages, and why were they selected?

The PFC stage uses STW20N95K5 (950 V, 0.275 Ω, TO-247), and the LCC half-bridge uses STW20N95DK5 (same specs, optimized for resonant switching). Both leverage MDmesh K5/DK5 technology for low Qg × Rds(on) and reduced Eoss, enabling high-frequency transition-mode operation with minimal losses across the wide input range.

Does the board support isolation between primary and secondary sides, and how is it implemented?

Yes-galvanic isolation is achieved via optocouplers (ACPL-782T-500E for PFC voltage sensing) and transformer-based auxiliary supplies (VIPER267KDTR flyback with dual isolated outputs). Signal isolation for gate drivers (STGAP2D) and MCU communication (PS9821) ensures safe, noise-immune operation across safety boundaries per IEC 62368-1.