STMicroelectronics STEVAL-ILD003V2

Overview

STEVAL-ILD003V2 from STMicroelectronics is a through-hole demonstration board implementing an analog leading-edge wall dimmer for 120 V AC mains, using the TS820-600FP sensitive SCR to drive dimmable CFL and LED lamps across 3–350 W with >98.5% efficiency at full load and <0.3 W standby loss.

For engineers reviewing the STEVAL-ILD003V2 datasheet, STEVAL-ILD003V2 pinout, STEVAL-ILD003V2 application, or STEVAL-ILD003V2 equivalent, this board serves as a validated reference for retrofitting legacy triac-based dimmers with flicker-free SCR control in residential lighting systems requiring RoHS-compliant, EMC-certified (IEC 61000-4-4 ≥4 kV) analog dimming.

Technical Context

The board implements a 2-wire, leading-edge phase-cut dimming topology where the TS820-600FP SCR is triggered via continuous gate current-eliminating flicker common in diac-triggered triac circuits. Timing is set by RC networks (R9/C7, R11/C3) controlling turn-on delay and conduction angle.

It operates across 98–132 V_rms at 50/60 Hz, supports halogen/CFL/LED loads, and achieves thermal stability up to 60 °C ambient using discrete heatsink-mountable SCRs and through-hole LC filter components (L1 = 29 µH, C1/C5 = 1 µF/100 nF) for field-modifiable tuning.

Key Specifications

Availability

STEVAL-ILD003V2 is available at Aetrix Electronics and suitable for residential lighting retrofits, LED lamp compatibility validation, and analog dimmer reference design development requiring stable component supply and documented EMC performance.

Supply support for STEVAL-ILD003V2 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 devices, sensors, and analog ICs for industrial, automotive, and consumer applications.

This board belongs to ST's STEVAL (ST Evaluation) series-engineered to accelerate prototyping of power conversion, lighting control, and analog interface solutions using ST's proprietary devices like the TS820 SCR family.

FAQ

What is the primary function of the STEVAL-ILD003V2 board?

The STEVAL-ILD003V2 is a fully assembled, tested demonstration board that implements an analog leading-edge dimmer using the TS820-600FP sensitive SCR. It replaces traditional diac-triac dimmers with flicker-free, low-standby-loss control for 120 V AC CFL and LED lamps, targeting residential wall-switch integration and compatibility testing.

Can this board drive non-dimmable LED lamps?

No-STEVAL-ILD003V2 is designed exclusively for dimmable LED lamps compliant with leading-edge phase-cut dimming. Non-dimmable LEDs lack internal circuitry to interpret phase-cut waveforms and may malfunction, overheat, or fail prematurely when used with this board.

Does the board include safety isolation between line and control sections?

No-STEVAL-ILD003V2 is a 2-wire, non-isolated topology: the potentiometer, gate drive network, and all low-voltage components share the same AC reference as the mains input. It is intended for evaluation only and requires proper enclosure, creepage/clearance compliance, and certified end-product safety validation before field deployment.

How is flicker eliminated compared to standard triac dimmers?

Flicker elimination is achieved by replacing the diac-triggered triac with the TS820-600FP sensitive SCR, which receives continuous gate current via transistor Q2/Q4 and RC timing networks. This ensures precise, jitter-free triggering at each half-cycle-unlike diac-based circuits susceptible to voltage threshold drift and inconsistent firing angles.