STMicroelectronics STEVAL-ISC002V1

Overview

STEVAL-ISC002V1 from STMicroelectronics is a 90 W resonant LCC AC-DC notebook power adapter evaluation board featuring universal input (90–264 VAC), 19 VDC/4.74 A output, <300 mV_P-P ripple, <0.5 W standby power, and >88% efficiency across full AC range. It implements PFC + multi-resonant half-bridge architecture using L6563 and L6599 controllers for high-end portable computing power supply validation.

For engineers reviewing the STEVAL-ISC002V1 datasheet, STEVAL-ISC002V1 schematic, STEVAL-ISC002V1 application, or STEVAL-ISC002V1 equivalent, this board serves as a reference design for high-efficiency, low-noise, wide-input AC-DC adapters targeting notebook OEMs and industrial power supply developers requiring validated PFC + resonant LLC topology implementation.

Technical Context

The board implements a two-stage architecture: an active PFC front-end using the L6563 controller in transition-mode, followed by a resonant half-bridge DC-DC stage controlled by the L6599 dual-gate driver with adaptive dead-time control and hiccup/latch protection modes. Input rectification uses STTH2R06 fast recovery diodes; output rectification employs STPS20L60CT Schottky synchronous rectifiers.

Protection features include overvoltage latch at >29 VDC, short-circuit hiccup recovery, and thermal foldback via NTC-based sensing. The design achieves <0.5 W no-load consumption through intelligent bias sequencing and controller sleep-state management.

Key Specifications

Availability

STEVAL-ISC002V1 is available at Aetrix Electronics and suitable for notebook adapter development, industrial AC-DC power supply qualification, and resonant converter topology validation requiring stable component supply and documented reference design integrity.

Supply support for STEVAL-ISC002V1 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, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

This board belongs to ST's STEVAL (ST Evaluation) series-engineered to demonstrate validated, production-ready power architectures using ST's proprietary controllers and discrete power devices.

FAQ

What is the primary purpose of the STEVAL-ISC002V1?

The STEVAL-ISC002V1 is a fully assembled, tested reference design board demonstrating a 90 W resonant LCC AC-DC adapter optimized for notebook applications. It validates ST's two-stage PFC + L6599-based resonant half-bridge architecture, providing engineers with a functional platform for performance benchmarking, compliance testing, and derivative design.

Does STEVAL-ISC002V1 support PFC functionality?

Yes-it integrates an active transition-mode PFC pre-regulator using the L6563 controller, achieving >0.99 power factor at full load and meeting IEC 61000-3-2 Class D harmonic limits. The PFC stage delivers a regulated 385 VDC bus to the downstream resonant converter.

Can STEVAL-ISC002V1 be modified for different output voltages?

Yes-the output voltage is set by the TL431 + PC817B optocoupler feedback network (R206/R210/R211). Adjusting R206 changes the regulation point; however, transformer turns ratio and output rectifier ratings must be verified for voltages outside 19 V ±10% due to L6599 gate drive and MOSFET SOA constraints.

What safety certifications does STEVAL-ISC002V1 meet?

The board is designed to meet EN 60950-1 (ITE safety) and EN 55022 Class B conducted/radiated emissions when implemented with recommended layout, filtering (CX1/CX2/CY1), and enclosure grounding. It is not pre-certified; final system-level certification remains the responsibility of the end-product designer.