STMicroelectronics STEVAL-ISC001V1

Overview

STEVAL-ISC001V1 from STMicroelectronics is a 30 W AC-DC evaluation board implementing an external power supply using the L6565 quasi-resonant controller and STP5NK80ZFP 800 V MOSFET, delivering 15 V ±3% at up to 2 A with ≤1% output ripple, compliant with European Code of Conduct Phase 2 no-load power limits (<0.75 W).

For engineers reviewing the STEVAL-ISC001V1 datasheet, STEVAL-ISC001V1 application, STEVAL-ISC001V1 schematic, or STEVAL-ISC001V1 alternative evaluation boards, this reference design supports rapid validation of high-efficiency, low-no-load-power AC-DC adapters for consumer electronics requiring regulatory-compliant 15 V/2 A output.

Technical Context

The board implements a quasi-resonant flyback topology controlled by the L6565 IC, operating across universal AC input (88–264 VAC, 50/60 Hz) with minimum switching frequency of 60 kHz at 100 VDC input to balance transformer size and core/switching losses.

It uses an STP5NK80ZFP 800 V super-junction MOSFET to withstand leakage inductance spikes, TL431 + PC817X1 optocoupler feedback for tight output regulation, and meets EU CoC Phase 2 efficiency and no-load power requirements (≤0.75 W at no load).

Key Specifications

Availability

STEVAL-ISC001V1 is available at Aetrix Electronics and suitable for consumer AC-DC adapter development, regulatory-compliant external power supply qualification, and L6565-based QR flyback reference design validation requiring stable component supply and documented performance data.

Supply support for STEVAL-ISC001V1 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, power ICs, analog chips, and evaluation platforms for industrial, automotive, and consumer markets.

This board belongs to ST's STEVAL (ST Evaluation) series-purpose-built reference designs that demonstrate validated topologies, simplify compliance testing, and accelerate time-to-certification for power conversion applications.

FAQ

What is the primary topology implemented on the STEVAL-ISC001V1?

The STEVAL-ISC001V1 implements a quasi-resonant (QR) flyback converter using the L6565 controller. It leverages zero-voltage switching to reduce EMI and improve efficiency, with transformer design and MOSFET selection (STP5NK80ZFP) optimized for 60 kHz minimum switching frequency and 800 V blocking capability.

Does the board meet international energy efficiency standards?

Yes, STEVAL-ISC001V1 complies with the European Code of Conduct on Efficiency of External Power Supplies, Phase 2 (effective 01.01.2003), including the ≤0.75 W no-load power requirement for 15–50 W rated output power class and >80% full-load efficiency across universal AC input.

Can the output voltage be modified to 12 V or 19 V?

Yes, output voltage can be adjusted by recalculating the TL431 feedback divider (R13/R14) and verifying optocoupler bias, transformer turns ratio, and output capacitor ratings. ST provides design guidelines in AN2305 and the L6565 datasheet, but revalidation of efficiency, ripple, and safety isolation is required.

Is the STEVAL-ISC001V1 RoHS-compliant and certified for safety standards?

The board is assembled with RoHS-compliant components per ST's manufacturing standards. While it is not itself a certified end-product, its design follows IEC 60950-1 creepage/clearance rules and serves as a basis for EN 61000-3-2 (harmonics) and EN 55022 (EMI) certification when integrated into properly engineered enclosures with appropriate safety approvals.