STMicroelectronics STEVAL-ISF001V1

Overview

STEVAL-ISF001V1 from STMicroelectronics is a 3 kW fixed off-time power factor correction (PFC) demonstration board built around the L6563 controller and STW55NM60N 600 V, 55 A N-channel MOSFET. It operates from single-range AC input (185–265 V, 50/60 Hz), delivers regulated 400 V ±5% DC output, achieves >95% efficiency and >0.98 power factor, and meets EN55014/EN55022 EMC requirements for residential applications.

For engineers reviewing the STEVAL-ISF001V1 datasheet, STEVAL-ISF001V1 pinout, STEVAL-ISF001V1 application, or STEVAL-ISF001V1 equivalent, this board serves as a validated reference for continuous-conduction-mode PFC design using transition-mode controller architecture in fixed off-time, variable-frequency PWM - enabling high-efficiency, low-THD (>95% eff, <10% THD from 1 kW), compact implementation without complex CCM drivers.

Technical Context

The board implements a boost-type PFC stage operating in continuous conduction mode (CCM) via ST's patented fixed off-time, variable-frequency control scheme-leveraging the L6563 in transition-mode configuration to emulate CCM current waveforms. This avoids dedicated CCM controllers while maintaining low THD and high PF.

Core topology integrates STW55NM60N as the main switching MOSFET, with inductor saturation protection, optimized EMI filter, and output voltage regulation tightly controlled to 400 V ±5%. Input RMS current is limited per utility metering constraints, targeting domestic appliance-grade loads up to 3 kW.

Key Specifications

Availability

STEVAL-ISF001V1 is available at Aetrix Electronics and suitable for residential appliance power supplies, industrial motor drives, and LED lighting systems requiring stable component supply and pre-validated PFC reference designs.

Supply support for STEVAL-ISF001V1 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, analog ICs, power devices, sensors, and digital ICs for industrial, automotive, and consumer markets.

This board belongs to ST's STEVAL evaluation platform family, engineered to accelerate adoption of ST's proprietary PFC control architectures-specifically targeting cost-sensitive, high-efficiency AC-DC front-end designs for home and building applications.

FAQ

Is STEVAL-ISF001V1 a production-ready power supply?

No. It is a demonstration board intended for design validation and reference use-not certified for end-product safety or regulatory compliance. Users must perform full safety, thermal, and EMC testing when integrating its topology into final products. The board lacks enclosure, isolation certification, and UL/IEC62368-1 markings.

What is the role of the L6563 on this board?

The L6563 is a transition-mode PFC controller configured in fixed off-time, variable-frequency mode to emulate continuous conduction mode behavior. It drives the STW55NM60N MOSFET, regulates output voltage to 400 V, and provides inductor saturation protection-enabling high PF and low THD without a dedicated CCM controller.

Can STEVAL-ISF001V1 operate with 110 V AC input?

No. It is designed exclusively for 185–265 V AC single-range input. Attempting 110 V operation will cause under-voltage lockout, failure to start, or unstable regulation. For 100–240 V universal input, ST recommends STEVAL-ISA032V1 or similar dual-range PFC reference boards.

Does the board include overtemperature or overcurrent protection?

It features inductor saturation protection and input overvoltage detection, but no dedicated overtemperature sensor or cycle-by-cycle overcurrent shutdown. Thermal management relies on heatsink design and ambient airflow; users must add external OCP/OTP circuits for robust system-level protection in production designs.