STMicroelectronics STEVAL-ILD005V1

Overview

STEVAL-ILD005V1 from STMicroelectronics is a trailing-edge phase-control rotary wall dimmer evaluation board built around two STF17N62K3 620 V, 17 A power MOSFETs and a triple 3-input NOR gate (HCF4025BE-compatible) for zero-crossing detection and gate drive timing. It supports 110 V or 230 V AC mains (±10%, 50/60 Hz), delivers flicker-free silent dimming from 15 W to 300 W depending on line voltage, and achieves >95% efficiency and >0.98 power factor at full load without heatsinks.

For engineers reviewing the STEVAL-ILD005V1 datasheet, STEVAL-ILD005V1 pinout, STEVAL-ILD005V1 application, or STEVAL-ILD005V1 equivalent, this board enables rapid validation of reverse-phase-cut dimming for halogen, ELV, CFL, and dimmable LED loads using a single linear rotary potentiometer with integrated mechanical on/off switch - critical for residential and commercial analog dimmer design.

Technical Context

The board implements analog trailing-edge (reverse-phase) dimming via dual N-channel MOSFETs operating in complementary switching mode, controlled by a CMOS NOR gate configured for zero-crossing sensing, timing delay generation, and synchronized gate drive pulses. Passive RC networks and diodes set firing angle based on potentiometer position, enabling smooth, buzz-free dimming across resistive and capacitive loads.

No microcontroller or digital controller is used; regulation relies entirely on discrete logic and passive component timing. The design avoids LC filters by meeting EN55015 conducted emission limits with intrinsic EMI suppression, and limits inrush current through soft-start behavior inherent in the phase-cut topology.

Key Specifications

Availability

STEVAL-ILD005V1 is available at Aetrix Electronics and suitable for residential lighting control, commercial retrofit dimmer development, and analog-to-digital dimmer interoperability testing requiring stable component supply and documented reference performance.

Supply support for STEVAL-ILD005V1 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 Lighting & Power Conversion Evaluation Kit product line, developed to accelerate adoption of efficient, standards-compliant AC dimming solutions for legacy and next-generation lighting loads.

FAQ

What type of dimming topology does STEVAL-ILD005V1 implement?

STEVAL-ILD005V1 implements trailing-edge (reverse-phase) dimming using dual STF17N62K3 MOSFETs switched in complementary mode. It detects AC zero-crossings via a resistor-diode network and uses a triple NOR gate to generate precisely timed gate pulses - enabling smooth, silent dimming compatible with halogen, ELV transformers, and dimmable CFL/LED lamps without audible noise or flicker.

Does STEVAL-ILD005V1 require external filtering for EMC compliance?

No. The board meets EN55015 conducted emission limits with a 300 W halogen lamp load without external LC filters. Its layout, component selection (including varistor R23 and snubber network C1/R24), and phase-cut timing inherently suppress common-mode and differential-mode noise to acceptable levels per lighting EMC standards.

Can STEVAL-ILD005V1 drive LED loads directly?

Yes - it is explicitly validated with "various dimmable CFL/LED lamps" per the official data brief. The trailing-edge topology avoids the high inrush currents and compatibility issues associated with leading-edge dimmers, making it suitable for modern LED drivers with capacitive input stages, provided those drivers are labeled "trailing-edge dimmable" or "ELV compatible".

What is the role of the HCF4025BE-compatible NOR gate on this board?

The triple 3-input NOR gate (U1, pin-compatible with ST's HCF4025BE) performs three critical functions: zero-crossing detection using AC-sampled voltage thresholds, timing delay generation via RC networks to set firing angle, and level-shifted gate drive signal formation for the dual MOSFETs - all without software or clock sources, enabling fully analog, deterministic dimming control.