STMicroelectronics STEVAL-ISA115V1

Overview

STEVAL-ISA115V1 from STMicroelectronics is an evaluation board implementing a non-isolated buck converter using the VIPER06XS high-voltage PWM controller, delivering 12 V at 150 mA from universal AC input (90–264 VAC, 45–65 Hz), with <50 mW standby consumption and >75% average efficiency for industrial power supply prototyping.

For engineers reviewing the STEVAL-ISA115V1 datasheet, STEVAL-ISA115V1 schematic, STEVAL-ISA115V1 application circuit, or STEVAL-ISA115V1 alternative evaluation boards, this board provides validated reference design, protection behavior verification, EMI-compliant layout, and quick-start configuration for VIPER06XS-based offline SMPS development.

Technical Context

The board implements a fixed-frequency (30 kHz) buck converter with frequency jittering to reduce EMI emissions, operating in discontinuous conduction mode (DCM) with internal current-mode PWM control. It integrates soft-start, adjustable current limiting via external resistor divider, and auto-restart fault recovery.

Protection functions include thermal shutdown with hysteresis, delayed overload response, open-loop failure detection on feedback disconnection, and avalanche-rugged 800 V drain capability-enabling robust operation without external sensing components.

Key Specifications

Availability

STEVAL-ISA115V1 is available at Aetrix Electronics and suitable for industrial power supply validation, embedded system auxiliary rail generation, and low-power AC/DC converter qualification requiring stable component supply and documented reference design fidelity.

Supply support for STEVAL-ISA115V1 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 analog, MCU, power, and sensor solutions for industrial, automotive, and consumer applications.

This evaluation board belongs to ST's STEVAL series of application-specific reference designs, created to accelerate adoption of VIPer™ Plus off-line converters by providing fully tested, compliant, and documented hardware implementations.

FAQ

What is the maximum output power supported by STEVAL-ISA115V1?

The board delivers 12 V at 150 mA continuously, yielding 1.8 W maximum output power. Its design targets low-power auxiliary supplies-not main system rails-and thermal performance is validated up to this rating under natural convection conditions per the original data brief.

Does STEVAL-ISA115V1 support adjustable output voltage?

No. The output is fixed at 12 V via a dedicated resistive feedback network (R4a/R4b/R5a/R5b) tied to the VIPER06XS COMP pin. Output voltage adjustment would require redesigning the feedback divider and verifying loop stability and protection thresholds.

Can STEVAL-ISA115V1 be used in safety-certified end equipment?

No. ST explicitly states that VIPER06XS and this board are not designed or authorized for safety-critical applications such as life support, active implanted devices, or systems requiring functional safety certification (IEC 61508, ISO 26262).

Is the schematic and PCB layout available for reuse?

Yes. The full schematic (Figure 1) and board layout details are published in DocID024373 Rev 2. ST grants permission for design reuse under its standard terms, provided the implementation remains consistent with the validated protection scheme and EMI filtering shown in the reference design.