STMicroelectronics EVL6563S-250W

Overview

EVL6563S-250W from STMicroelectronics is a 250 W transition-mode (TM) power factor correction (PFC) demonstration board built around the L6563S PFC controller IC. It delivers a regulated 400 V DC output from 90–265 V AC mains, achieves >94% peak efficiency, maintains PF ≥0.985 and THD ≤3.95% at full load, and complies with EN61000-3-2 Class D and JEITA-MITI standards - designed for desktop PC, industrial SMPS, and flat-panel display power supplies.

For engineers reviewing the EVL6563S-250W datasheet, EVL6563S-250W pinout, EVL6563S-250W application, or EVL6563S-250W equivalent, this board provides validated reference design data including harmonic compliance waveforms, thermal maps, EMI pre-compliance results, startup/brown-out behavior, and PFC_OK protection sequencing - critical for rapid PFC stage integration and regulatory certification.

Technical Context

The EVL6563S-250W implements a boost-type TM PFC pre-regulator using dual parallel STF12NM50N MOSFETs, a 180 µH custom inductor (TDK PFC3819QM-181K09B01), and an STTH5L06 ultrafast output diode. Control is handled by the L6563S SO-14 IC, which uses zero-current detection (ZCD), voltage feed-forward (VFF), and dynamic OVP via the PFC_OK pin to ensure stable 400 V regulation across 90–265 V AC input.

It supports key system-level functions: brown-out protection (RUN pin threshold 0.8 V), latched feedback failure shutdown (INV <1.66 V), remote on/off control (PFC_OK <0.23 V), and cascaded PWM controller interfacing via PWM_LATCH/PWM_STOP pins - enabling coordinated start-up, fault isolation, and hold-up time management (10 ms at 300 V drop).

Key Specifications

Availability

EVL6563S-250W is available at Aetrix Electronics and suitable for desktop PC power supplies, industrial switch-mode power supplies, and flat-panel display power architectures requiring stable component supply, fast regulatory validation, and proven PFC reference design reuse.

Supply support for EVL6563S-250W 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 sensor solutions for industrial, automotive, and consumer markets.

The EVL6563S-250W belongs to ST's evaluation board portfolio for PFC controllers, specifically developed to accelerate adoption of the L6563S in high-efficiency, wide-input AC-DC front-end designs targeting IEC61000-3-2 compliance.

FAQ

What is the primary function of the EVL6563S-250W board?

The EVL6563S-250W is a fully assembled, tested demonstration board implementing a 250 W transition-mode PFC pre-regulator. Its core function is to correct input current waveform distortion, deliver a stable 400 V DC bus, and meet harmonic limits defined in EN61000-3-2 Class D and JEITA-MITI standards - serving as a turnkey reference for integrating L6563S-based PFC stages into commercial power supplies.

Does the board include EMI filtering and thermal validation data?

Yes. The board integrates a dedicated input EMI filter (L1: 7.9 mH common-mode choke) and includes conducted EMI pre-compliance measurements (CE AVG) for both phase and neutral lines at 115 V/60 Hz and 230 V/50 Hz. Thermal maps (Figures 38–39) document PCB top-side temperature distribution under full-load conditions, confirming safe operation up to 50 °C ambient with the provided heatsink (HS1) for D1, Q1, and Q2.

How does the PFC_OK pin function on this board?

The PFC_OK pin (#7 of U1, L6563S) serves three roles: (1) dynamic overvoltage protection (shuts down when voltage exceeds 2.5 V, restarts below 2.4 V); (2) feedback failure latch (if INV pin falls below 1.66 V simultaneously); and (3) remote on/off control (shutdown when pin voltage <0.23 V, restart above 0.27 V). All behaviors are validated in Section 4.5 of AN3119 with oscilloscope waveforms.

Can the EVL6563S-250W be used with external Vcc or cascaded controllers?

Yes. J3 connector provides dedicated pins for external Vcc supply to the L6563S, plus PWM_LATCH (#8) and PWM_STOP (#9) outputs to coordinate with downstream isolated DC-DC controllers. Section 4.7 and Figures 34–36 detail interface circuits for both latched and non-latched control, enabling synchronized start-up, fault propagation, and light-load management between PFC and PWM stages.