STMicroelectronics STEVAL-ISA180V1

Overview

STEVAL-ISA180V1 from STMicroelectronics is an evaluation board implementing a flyback isolated DC-DC converter using the VIPer0P off-line high-voltage controller IC, delivering 12 V at 0.6 A (7.2 W) from universal AC input (85–265 VAC), with <18 mW standby power at 230 VAC, >80% active-mode efficiency, and EN55022 Class-B EMI compliance.

For engineers reviewing the STEVAL-ISA180V1 datasheet, STEVAL-ISA180V1 schematic, STEVAL-ISA180V1 application, or STEVAL-ISA180V1 equivalent, this board serves as a validated reference design for compact, low-standby, isolated AC/DC conversion in industrial control interfaces, smart home power supplies, and IoT sensor node adapters requiring RoHS-compliant, safety-certifiable topology validation.

Technical Context

The board implements a current-mode controlled flyback topology with primary-side regulation, leveraging the VIPer0P's integrated 800 V MOSFET and zero-power features including pulse-skipping mode to prevent transformer flux runaway and delayed overload protection triggered by sustained overcurrent.

It uses primary-side sensing via auxiliary winding feedback (FB pin), incorporates VCC clamp and thermal shutdown for robustness, and achieves Class-B EMI performance without external Y-capacitors or common-mode chokes-enabled by optimized transformer layout and snubberless operation.

Key Specifications

Availability

STEVAL-ISA180V1 is available at Aetrix Electronics and suitable for industrial control interfaces, smart home power supplies, and IoT sensor node adapters requiring stable component supply and pre-validated safety-isolated AC/DC architecture.

Supply support for STEVAL-ISA180V1 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 devices, and MEMS sensors for industrial, automotive, and consumer applications.

This board belongs to ST's STEVAL (ST Evaluation) series, developed to accelerate prototyping and regulatory validation of VIPerPlus-based AC/DC converters targeting cost-sensitive, safety-critical auxiliary power designs.

FAQ

What is the purpose of the STEVAL-ISA180V1 evaluation board?

The STEVAL-ISA180V1 is a fully assembled, tested reference design for a 7.2 W isolated flyback converter using the VIPer0P IC. It enables rapid validation of transformer design, EMI behavior, thermal performance, and safety isolation (reinforced creepage/clearance) under real-world AC line conditions-without requiring custom PCB development or firmware.

Does STEVAL-ISA180V1 include safety certification documentation?

No-while the board implements reinforced insulation and meets EN55022 Class-B EMI, ST does not provide pre-certified safety reports (e.g., UL/IEC 62368-1). Users must perform full system-level safety testing and certification, including dielectric withstand (Hi-Pot), creepage/clearance verification, and fault-condition analysis per applicable end-equipment standards.

Can the output voltage be adjusted to 5 V or 15 V?

Yes-the output is set by the auxiliary winding turns ratio and FB resistor divider (R9/R10 on schematic). To change output voltage, recalculate R9/R10 values per VIPer0P datasheet Equation 4 and verify transformer auxiliary winding ratio; ST provides design equations and layout guidelines in AN4720 and the VIPer0P datasheet.

Is the VIPer0P IC replaceable with VIPer22A or VIPer06?

No-VIPer0P integrates zero-power features and pulse-skip mode not present in VIPer22A or VIPer06. Substitution would require redesigning compensation (COMP pin), feedback network, and protection timing; ST explicitly positions VIPer0P for ultra-low-standby applications where those predecessors exceed 30 mW no-load consumption.