STMicroelectronics STEVAL-ISA162V1

Overview

STEVAL-ISA162V1 from STMicroelectronics is an evaluation board implementing a 12 V/0.84 A (10 W), quasi-resonant flyback converter with universal AC input (90–265 VAC, 50–60 Hz), >82% average efficiency (CoC v5 Tier 2 compliant), <35 mW standby consumption at 230 VAC, and integrated VIPer25HD high-voltage controller with 800 V MOSFET.

For engineers reviewing the STEVAL-ISA162V1 datasheet, STEVAL-ISA162V1 schematic, STEVAL-ISA162V1 application notes, or STEVAL-ISA162V1 alternative evaluation boards, this page provides verified board-level specifications, functional context, design trade-offs, and supply-chain support for rapid prototyping of compact offline SMPS designs.

Technical Context

The board implements an isolated, transformer-coupled flyback topology using the VIPer25HD IC, which integrates an 800 V avalanche-rated power MOSFET and current-mode PWM controller. Quasi-resonant (QR) switching reduces EMI and improves light-load efficiency via valley-switching detection.

Burst-mode operation enables ultra-low no-load standby power (<35 mW), while dual-level overcurrent protection (OCP), output overvoltage protection (OVP), short-circuit protection, and thermal shutdown with hysteresis ensure robust fault recovery and automatic restart after fault removal.

Key Specifications

Availability

STEVAL-ISA162V1 is available at Aetrix Electronics and suitable for industrial power supplies, smart home AC/DC adapters, IoT sensor node power stages, and medical auxiliary power modules requiring stable component supply and pre-validated reference designs.

Supply support for STEVAL-ISA162V1 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, sensors, and analog/mixed-signal devices for automotive, industrial, and consumer applications.

This board belongs to ST's STEVAL (ST Evaluation) series - purpose-built reference platforms that demonstrate validated power conversion topologies using ST's proprietary VIPerPlus off-line converters for fast, compliant, low-BOM AC/DC design.

FAQ

What is the primary function of the STEVAL-ISA162V1 evaluation board?

The STEVAL-ISA162V1 is a fully assembled, tested reference design for a 10 W isolated quasi-resonant flyback converter. It demonstrates the VIPer25HD IC's capability to deliver regulated 12 V/0.84 A from universal AC input with high efficiency, low standby power, and built-in protections-enabling rapid validation of offline SMPS designs without custom transformer development.

Does the board include safety certifications or agency approvals?

No. The STEVAL-ISA162V1 is an evaluation tool-not a certified end-product. It lacks enclosure, creepage/clearance compliance documentation, or UL/CE marking. Engineers must perform full safety certification on their final product, including transformer isolation testing, PCB layout review per IEC 62368-1, and conducted/radiated EMI re-measurement in target mechanical housing.

Can the output voltage be adjusted, and if so, how?

Yes, the output voltage is set by a resistive feedback divider (R13/R14) connected to the VIPer25HD's FB pin. Adjusting R13 or R14 changes the voltage division ratio, allowing reconfiguration to other outputs (e.g., 5 V, 15 V) within the IC's 12–24 V FB range. The board's transformer turns ratio and snubber components remain compatible for moderate adjustments without redesign.

What are the key layout features that contribute to its EMI performance?

The board uses a tightly coupled primary-secondary transformer footprint, minimized high-di/dt loop area for the drain-source path, ground-plane separation between power and signal sections, and integrated RC snubber on the primary switch node. These features-combined with QR operation-enable EN55022 Class B compliance without external common-mode chokes or Y-capacitors in typical lab setups.