STMicroelectronics STEVAL-ISA114V1

Overview

STEVAL-ISA114V1 from STMicroelectronics is an evaluation board implementing a non-isolated buck converter using the VIPer06XS high-voltage PWM controller, delivering 5 V at 160 mA from universal AC input (90–264 VAC, 45–65 Hz), with integrated thermal shutdown, open-loop protection, and auto-restart fault recovery for industrial power supply prototyping.

For engineers reviewing the STEVAL-ISA114V1 datasheet, STEVAL-ISA114V1 pinout, STEVAL-ISA114V1 application, or STEVAL-ISA114V1 equivalent, this board enables rapid validation of VIPer06XS-based 5 V offline SMPS designs with EMI-compliant layout, adjustable current limiting, and low standby power consumption in compact SSO-10 footprint.

Technical Context

The board implements a fixed-frequency (30 kHz) buck topology with frequency jittering to reduce conducted EMI, operating without optocoupler feedback via primary-side regulation. It uses the VIPer06XS's internal 800 V avalanche-rugged power section and on-chip soft-start to limit inrush current during cold start.

Protection logic includes delayed overload response, thermal shutdown with hysteresis, and immediate detection of feedback loop disconnection-each triggering safe auto-restart mode. Output regulation precision is ±5% under line/load variation, with high-frequency ripple held to 50 mV peak-to-peak.

Key Specifications

Availability

STEVAL-ISA114V1 is available at Aetrix Electronics and suitable for industrial control interfaces, smart meter auxiliary supplies, and IoT sensor node power design requiring stable component supply, repeatable layout reference, and fast functional validation.

Supply support for STEVAL-ISA114V1 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 sensing solutions for automotive, industrial, and consumer applications.

This board belongs to ST's STEVAL (ST Evaluation) series, purpose-built to accelerate development of power conversion subsystems using ST's VIPer™ family of high-voltage offline controllers for cost-sensitive, space-constrained non-isolated SMPS.

FAQ

Is STEVAL-ISA114V1 isolated or non-isolated?

STEVAL-ISA114V1 implements a non-isolated buck converter topology. There is no transformer-based galvanic isolation between input and output; the output shares ground with the primary-side circuitry. This design targets applications where isolation is not required, such as internal auxiliary rails in industrial equipment.

What is the role of the VIPer06XS IC on this board?

The VIPer06XS serves as the integrated high-voltage PWM controller and power switch, combining an 800 V avalanche-rugged MOSFET with oscillator, current sense, soft-start, and protection logic in a single SSO-10 package. It directly drives the buck switch and regulates output via primary-side sensing.

Can this board be modified for 3.3 V output?

Yes-output voltage is set by the FB resistor divider network (R4a/R4b/Rbl). Replacing R4a (1.5 kΩ) and R4b (22 kΩ) with appropriate values recalculates the feedback ratio to achieve 3.3 V, maintaining ±5% regulation accuracy and full protection functionality per VIPer06XS datasheet guidelines.

Does STEVAL-ISA114V1 include EMI filtering components?

Yes-the board integrates a two-stage EMI filter: C1/C2 (2.2 µF/400 V electrolytics) and L1 (1 mH common-mode choke) at the AC input, plus CFB and Cf (100 nF ceramic) across the rectifier and VIPer06XS drain-source, enabling compliance with EN55022 Class B without external add-ons.