STMicroelectronics STEVAL-ISA130V1

Overview

STEVAL-ISA130V1 from STMicroelectronics is a non-isolated buck topology demonstration board based on the VIPer06XN high-voltage PWM controller, delivering 12 V at up to 140 mA from 85–265 V_AC or 100–375 V_DC input, operating at 30 kHz with jittered fixed-frequency control and on-board soft-start.

For engineers reviewing the STEVAL-ISA130V1 datasheet, STEVAL-ISA130V1 pinout, STEVAL-ISA130V1 application, or STEVAL-ISA130V1 equivalent, this board serves as a validated reference design for low-power offline AC/DC conversion without auxiliary winding, supporting rapid evaluation of VIPer06XN-based buck regulators in space-constrained industrial and consumer power supplies.

Technical Context

The board implements a current-mode controlled, non-isolated buck regulator using the VIPer06XN's integrated 800 V avalanche-rugged power section and internal oscillator. It operates at a fixed 30 kHz switching frequency with intentional jitter to reduce EMI peaks.

Input range spans universal AC (85–265 V_AC) and wide-range DC (100–375 V_DC); output voltage is resistor-adjustable, and no-load consumption is below 30 mW at 265 V_AC, enabled by low-power startup architecture and hysteretic thermal shutdown.

Key Specifications

Availability

STEVAL-ISA130V1 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart meter auxiliary supplies, IoT edge device power rails, and low-power AC/DC adapter development requiring stable component supply and fast time-to-evaluation.

Supply support for STEVAL-ISA130V1 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 MEMS sensors for industrial, automotive, and consumer markets.

This board belongs to ST's STEVAL (ST Evaluation) series - purpose-built reference designs that accelerate prototyping and qualification of ST power controllers like VIPer in real-world AC/DC and DC/DC applications.

FAQ

Is STEVAL-ISA130V1 suitable for isolated power supply designs?

No. The board implements a non-isolated buck topology with no transformer or isolation barrier. It is intended only for applications where primary-side grounding is acceptable and galvanic isolation is not required, such as auxiliary supplies on the same PCB as the main controller.

Can the output voltage be adjusted to values other than 12 V?

Yes. The output voltage is set by a single external resistor in the feedback network. Changing its value allows precise adjustment across a range determined by the VIPer06XN's internal reference (typically 1.235 V), as documented in the VIPer06 datasheet.

Does STEVAL-ISA130V1 require an auxiliary winding or bias supply?

No. It uses the VIPer06XN's high-voltage start-up circuitry, eliminating the need for an auxiliary winding or external bias supply - reducing component count and board area in low-power offline converters.

What safety certifications does this board carry?

The STEVAL-ISA130V1 itself is not a certified end-product and carries no UL/EN/IEC certification. It is a development tool; final system certification must be performed on the complete end equipment incorporating appropriate insulation, creepage, and clearance design per IEC 62368-1 or IEC 61347.