STMicroelectronics STEVAL-VP26K01B

Overview

STEVAL-VP26K01B from STMicroelectronics is a compact 15 V / 100 mA buck converter reference design for ultra-wide input voltage auxiliary power supplies (90–600 VAC or 60–870 VDC), built around the VIPER265KDTR high-voltage offline controller with integrated 1050 V Power MOSFET and current-mode PWM control, enabling direct mains connection without input voltage limiters or stacked MOSFETs.

For engineers reviewing the STEVAL-VP26K01B datasheet, STEVAL-VP26K01B pinout, STEVAL-VP26K01B application, or STEVAL-VP26K01B equivalent, this board delivers verified line/load regulation performance, EMI-compliant operation via frequency jittering at 60 kHz, and a minimal BOM implementation of a high-voltage buck topology using ST's VIPerPlus family.

Technical Context

The STEVAL-VP26K01B implements a non-isolated buck converter topology using the VIPER265KDTR IC, which integrates a 1050 V avalanche-rated Power MOSFET and current-mode PWM controller operating at a fixed 60 kHz switching frequency with intentional frequency jitter to reduce conducted EMI peaks.

Input rectification uses dual STTH110A 1000 V ultrafast diodes in series, while output rectification employs BAT41 low-capacitance Schottky diodes; regulation is achieved via feedback through the FB pin of the VIPER265KDTR, with tight line and load regulation maintained across the full 60–870 VDC input range.

Key Specifications

Availability

STEVAL-VP26K01B is available at Aetrix Electronics and suitable for industrial motor control auxiliary supplies, smart energy metering power rails, and HV DC link monitoring circuits requiring stable component supply and rapid prototyping validation.

Supply support for STEVAL-VP26K01B 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, Switzerland, designing and manufacturing microcontrollers, power ICs, analog devices, and MEMS sensors for industrial, automotive, and consumer applications.

The STEVAL-VP26K01B belongs to ST's evaluation board portfolio for the VIPerPlus high-voltage converter family, engineered specifically to accelerate development of cost-sensitive, ultra-wide-input auxiliary power supplies in harsh HV environments.

FAQ

Is STEVAL-VP26K01B isolated or non-isolated?

STEVAL-VP26K01B implements a non-isolated buck topology. There is no transformer or isolation barrier; the output shares ground with the input return path. This design prioritizes simplicity and cost reduction but requires adherence to functional insulation requirements and proper PCB creepage/clearance for safety-critical deployments.

What is the role of the VIPER265KDTR on this board?

The VIPER265KDTR serves as the primary power controller, integrating a 1050 V avalanche-rated Power MOSFET, current-mode PWM controller, startup circuitry, and protection features including overcurrent, overtemperature, and auto-restart. It directly drives the buck switch and regulates output via feedback on the FB pin.

Can STEVAL-VP26K01B operate from 230 VAC mains?

Yes - the board is explicitly rated for 90–600 VAC input, fully covering 230 VAC nominal mains with margin for surges and harmonics. Input rectification uses two series-connected STTH110A 1000 V ultrafast diodes, providing robust AC-to-DC conversion without external voltage clamping.

Does this board meet EMC standards out-of-the-box?

Yes - the design meets IEC55022 Class B conducted EMI requirements when used with the specified components and layout, leveraging the VIPER265KDTR's built-in frequency jittering feature to spread spectral energy and reduce peak emissions, allowing a smaller EMI filter than conventional fixed-frequency designs.