STMicroelectronics EVL6566A-75WES4

Overview

EVL6566A-75WES4 from STMicroelectronics is a 75 W transition-mode (TM) PFC evaluation board based on the L6563S controller IC, designed for high-efficiency AC-DC pre-regulation in single-phase systems. It implements tracking boost, bidirectional 1/V² voltage feedforward, and integrated OVP/FFP protection, delivering <5% THD at full load across 85–265 VAC input and maintaining EN61000-3-2 Class D compliance.

For engineers reviewing the EVL6566A-75WES4 datasheet, EVL6566A-75WES4 application, EVL6566A-75WES4 schematic, or EVL6566A-75WES4 bill of materials, this board provides validated reference design, thermal performance data, and layout guidance for rapid integration into desktop PC power supplies, server auxiliary rails, and IEC61000-3-2-compliant SMPS up to 400 W.

Technical Context

This evaluation board implements a continuous conduction mode (CCM)-compatible TM PFC stage using the L6563S controller, with fixed-off-time (FOT) control logic and zero-current detection (ZCD) for precise MOSFET turn-on timing. The board integrates a custom-wound boost inductor, 600 V/11 A Si MOSFET (STP11NM60ND), and precision feedback network calibrated for 390 V ±2% regulated output.

It supports remote ON/OFF via RUN pin (Pin 10), interfaces with downstream PWM controllers through PFC_OK (Pin 7), PWM_STOP (Pin 9), and PWM_LATCH (Pin 8), and includes hardware-configurable brownout protection, inductor saturation detection, and latched shutdown on feedback loop failure - all verified per JEITA-MITI and EN61000-3-2 test conditions.

Key Specifications

Availability

EVL6566A-75WES4 is available at Aetrix Electronics and suitable for desktop PC power supplies, server auxiliary rails, and IEC61000-3-2-compliant industrial SMPS requiring stable component supply, fast design validation, and regulatory test support.

Supply support for EVL6566A-75WES4 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, specializing in power management, analog, microcontrollers, and automotive ICs.

The EVL6566A-75WES4 belongs to ST's PFC Evaluation Board product line, engineered to accelerate development of energy-efficient, standards-compliant AC-DC front-ends for computing and industrial power systems.

FAQ

What is the primary function of the EVL6566A-75WES4 evaluation board?

The EVL6566A-75WES4 is a fully assembled, tested reference design board that demonstrates the L6563S transition-mode PFC controller in a 75 W pre-regulator configuration. It delivers validated performance data-including efficiency curves, THD waveforms, and thermal imaging-for rapid system-level integration and regulatory testing, not as a production-ready module.

Does this board support universal input voltage and what are its compliance certifications?

Yes, it operates across 85–265 VAC input and has been verified to meet EN61000-3-2 Class D harmonic emission limits and JEITA-MITI standards under full-load and light-load conditions. Certification test reports (including input current waveform plots and conducted emissions scans) are included in the board's user manual (UM1290 Rev 3).

Can the output voltage be adjusted, and how is tracking boost configured?

The nominal output is fixed at 390 VDC via factory-calibrated resistor dividers on INV and PFC_OK pins. Tracking boost is enabled by connecting a resistor between TBO (Pin 6) and GND; the resulting current sinks from INV (Pin 1), dynamically scaling output voltage with RMS input-e.g., ~320 V at 100 VAC and ~390 V at 230 VAC-without firmware changes.

What protection features are implemented and how are they triggered?

Hardware-enforced protections include overvoltage (PFC_OK >2.5 V → latched shutdown), feedback failure (INV <1.66 V + PFC_OK >2.5 V → latched), brownout (RUN <0.8 V → non-latched stop), and inductor saturation (CS >1.7 V → cycle-by-cycle current limiting). All are implemented in analog circuitry with no software dependency.