STMicroelectronics STEVAL-ISA102V1

Overview

STEVAL-ISA102V1 from STMicroelectronics is an 80 W high-performance transition-mode (TM) power factor correction (PFC) demonstration board based on the L6562A controller and STP8NM50FP MOSFET, delivering regulated 400 V DC output from 88–265 VAC input with ≥92% efficiency at 90 VAC/80 W, 10 Vpk-pk 2fL ripple, and 20 ms hold-up time. It targets ballast, flat-panel display, and AC-DC adapter pre-regulation stages.

For engineers reviewing the STEVAL-ISA102V1 datasheet, STEVAL-ISA102V1 pinout, STEVAL-ISA102V1 application, or STEVAL-ISA102V1 equivalent, key selection criteria include TM PFC topology validation, 400 V regulated bus generation, 88–265 VAC universal input support, thermal performance at 50 °C ambient, and single-sided CEM-1 PCB layout for cost-sensitive industrial designs.

Technical Context

The board implements a boost-type transition-mode PFC pre-converter using the L6562A current-mode controller, which senses zero-current crossing (ZCD) and inductor current (CS) to achieve near-unity power factor across universal AC input. The STP8NM50FP 500 V, 8 A N-channel MOSFET operates with variable frequency above 35 kHz to minimize EMI and conduction losses.

Input rectification uses STTH1L06 fast recovery diode, while output filtering relies on a 47 µF/450 V electrolytic capacitor and a custom E2543/E core boost inductor (0.7 mH, 102-turn primary). Hold-up time is validated at 20 ms with VDROP = 300 V after discharge under full load.

Key Specifications

Availability

STEVAL-ISA102V1 is available at Aetrix Electronics and suitable for LED ballast design, flat-panel TV power supplies, universal-input AC-DC adapters, and industrial PFC validation requiring stable component supply and documented reference implementation.

Supply support for STEVAL-ISA102V1 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, and silicon solutions for automotive, industrial, and consumer markets.

The STEVAL evaluation board series delivers application-validated reference designs for ST's analog and power ICs, enabling rapid prototyping of PFC, SMPS, motor control, and sensor signal conditioning subsystems.

FAQ

What is the primary function of the STEVAL-ISA102V1 board?

The STEVAL-ISA102V1 is a fully assembled, tested demonstration board implementing an 80 W transition-mode PFC pre-regulator. Its purpose is to validate the L6562A controller in a real-world boost topology, delivering a stable 400 V DC bus from universal AC input while meeting IEC 61000-3-2 harmonic standards.

Does this board include a complete AC-DC power supply or only the PFC stage?

This board implements only the active PFC pre-converter stage-not a full AC-DC supply. It generates a regulated 400 V DC output suitable for feeding isolated DC-DC converters (e.g., flyback or LLC), but lacks secondary-side regulation, isolation, or low-voltage outputs.

Can the STEVAL-ISA102V1 be used with input voltages below 88 VAC?

No-operation below 88 VAC is outside the validated specification. The L6562A controller and boost inductor are tuned for stable TM operation across 88–265 VAC; lower input causes loss of zero-current detection, reduced efficiency, and potential overcurrent faults.

Is the PCB layout provided for this board?

Yes-the board uses a documented single-sided CEM-1 layout (108 × 57 mm, 35 µm copper), and the schematic plus bill-of-materials is published in Doc ID 022845 Rev 1. However, Gerber files and detailed layout guidelines are not included in the public data brief and require direct engagement with ST's technical support.