STMicroelectronics EVL6562A-35WFLB

Overview

EVL6562A-35WFLB from STMicroelectronics is a 35 W, wide-input (90–265 VAC), transition-mode power factor correction (PFC) evaluation board based on the L6562A controller and flyback topology. It delivers 48 V regulated output with ≥0.9 power factor at 50% load, ≥85% efficiency at full load, and <1.5 V_pk-pk output ripple - validated for LED lighting and low-power AC/DC SMPS applications.

For engineers reviewing the EVL6562A-35WFLB datasheet, EVL6562A-35WFLB schematic, EVL6562A-35WFLB application notes, or EVL6562A-35WFLB compliance test reports, this board provides pre-validated EN61000-3-2 Class-C harmonic suppression, EN55022 Class-B conducted EMI performance, 2.5 kV surge immunity, and thermal operation up to 50 °C ambient.

Technical Context

The board implements a transition-mode (TM) PFC flyback converter using the L6562A controller to shape input current into a near-sinusoidal waveform synchronized with mains voltage. It employs an ETD29 transformer (Magnetica 4126), STP5NK80ZFP MOSFET in TO-220FP package, and isolated optocoupler-based voltage regulation via TL431.

Input rectification uses a 2KBP08M bridge; output rectification uses STTH3R02 (3 A, 200 V); transient protection includes P6KE300A Transil clamp and 275 V varistor. The design achieves <0.4 V_RMS 100/120 Hz ripple and maintains stable 48 V output across 90–265 VAC input and 40 mA–700 mA load range.

Key Specifications

Availability

EVL6562A-35WFLB is available at Aetrix Electronics and suitable for LED driver development, universal-input AC/DC adapter prototyping, and industrial low-power SMPS validation requiring stable component supply and documented regulatory performance.

Supply support for EVL6562A-35WFLB 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 analog, microcontroller, power, and automotive ICs for industrial, consumer, and automotive markets.

This evaluation board belongs to ST's Power Supply Evaluation Platform series, engineered to accelerate adoption of its transition-mode PFC controllers in cost-sensitive, high-efficiency lighting and adapter designs.

FAQ

What is the primary purpose of the EVL6562A-35WFLB board?

The EVL6562A-35WFLB is a fully assembled, tested evaluation board demonstrating a 35 W, wide-range-input, high-power-factor flyback converter using the L6562A controller. Its purpose is to provide engineers with a reference design for rapid prototyping and regulatory validation of LED drivers and low-power AC/DC supplies meeting EN61000-3-2 and EN55022 requirements.

Can this board be used for constant-current LED driving?

Yes - the board supports secondary current-loop modification per AN2838 Section 7, enabling constant-current operation at 700 mA. This requires replacing U3 (TL431) with TSM1052, adjusting R20/R21 for current sense gain, and adding C25–C27; minimum output voltage under current mode is ~30 V, limiting series LED count accordingly.

What safety and isolation ratings does the board meet?

The board provides 4 kV primary-to-secondary insulation (per transformer spec), reinforced isolation via optocoupler feedback, and meets EN61000-3-2 Class-C harmonic limits. Input EMI filtering includes dual common-mode chokes (T1/T2), Y-capacitors (C1–C4, C10–C11, C18–C22), and a 275 V varistor - satisfying basic safety and conducted emission requirements for Class II equipment.

Is thermal performance documented for continuous operation?

Yes - thermal imaging data (Figures 20–21, Table 2) confirms all critical components operate within safe limits at 50 °C ambient: MOSFET Q1 peaks at 57.8 °C (90 VAC), secondary diode D5 at 58.9 °C, and Transil D2 at 70 °C. No forced airflow is required, supporting convection-cooled LED fixture integration.