STMicroelectronics STEVAL-ILL069V1

Overview

STEVAL-ILL069V1 from STMicroelectronics is a 35 W single-sided evaluation board implementing a wide-input (90–264 V_rms) quasi-resonant flyback converter using the HVLED001 controller, delivering regulated 48 V / 730 mA and auxiliary 14 V / 20 mA outputs with >90% full-load efficiency and <400 mW no-load consumption.

For engineers reviewing the STEVAL-ILL069V1 datasheet, STEVAL-ILL069V1 pinout, STEVAL-ILL069V1 application, or STEVAL-ILL069V1 equivalent, this board serves as a validated reference design for LED driver auxiliary supplies, high-PF offline converters, and isolated 48 V bus generation in lighting control systems requiring EN60065 compliance and robust surge protection.

Technical Context

The board implements a primary-side regulated quasi-resonant flyback topology with HVLED001 controlling MOSFET Q1 (STF8N80K5) via gate driver output (GD), using ZCD for zero-current detection and FB for output voltage sensing. Frequency fold-back reduces switching frequency at light loads to maintain regulation and minimize output ripple.

Protections include short-circuit and overload auto-restart, overvoltage clamping (D4: P6KE-350), input surge handling up to 305 V_rms (with Q1 replacement to STF5N95K5), and brown-out detection via HVSU pin. Input rectification uses 2KBP08M bridge; secondary rectification employs STTH108 and STPS20200CT.

Key Specifications

Availability

STEVAL-ILL069V1 is available at Aetrix Electronics and suitable for LED driver auxiliary supply design, isolated 48 V bus generation, and high-power-factor offline converter prototyping requiring stable component supply and regulatory-compliant reference implementation.

Supply support for STEVAL-ILL069V1 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 ICs, analog devices, and silicon solutions for industrial, automotive, and consumer applications.

This board belongs to ST's STEVAL (ST Evaluation) series, developed specifically to accelerate design-in of ST's power management ICs-including HVLED001-into lighting, industrial, and appliance power supply applications.

FAQ

What is the maximum input voltage supported by STEVAL-ILL069V1?

The board operates up to 264 V_rms as standard. With MOSFET Q1 replaced by STF5N95K5, it supports 305 V_rms input per the schematic note and revision history, enabling compatibility with higher-voltage industrial mains or temporary overvoltage conditions.

Does STEVAL-ILL069V1 provide galvanic isolation between primary and secondary sides?

Yes - the design uses transformer T2 (B82731T-2451A) with reinforced insulation, and the PCB layout separates primary and secondary ground planes. Isolation is verified per EN60065, supporting safe operation in Class I and II lighting equipment.

Can the auxiliary 14 V output be used to power external circuits?

Yes - the 14 V / 20 mA auxiliary output (V_SAux) is fully regulated and accessible via TP11 and J2 pin 3. It is intended for low-power control circuitry such as microcontrollers, optocouplers, or dimming interfaces, with dedicated filtering (C21, R12–R13).

How is output short-circuit protection implemented?

Short-circuit protection is handled by the HVLED001 IC via current-sense resistor R10 (0.82 Ω) monitoring primary peak current. Upon fault detection, the controller enters auto-restart mode - halting switching and periodically attempting recovery - preventing thermal damage while maintaining safe operation in lighting environments.