STMicroelectronics STEVAL-VP12201B

Overview

STEVAL-VP12201B from STMicroelectronics is an evaluation board implementing a 15 V/200 mA (3 W) offline buck converter for universal AC input (85–265 VAC, 50–60 Hz), built around the VIPER122 high-voltage PWM controller with integrated 730 V Power MOSFET and current-mode control. It delivers tight line/load regulation, <30 mW standby consumption at 230 VAC, >77% average efficiency, and meets IEC 55022 Class B conducted EMI with minimal filter.

For engineers reviewing the STEVAL-VP12201B datasheet, STEVAL-VP12201B schematic, STEVAL-VP12201B application notes, or STEVAL-VP12201B alternative evaluation boards, this page provides verified design context, measured performance data, pin-level interface mapping, regulatory compliance details, and supply-chain support for prototyping AC/DC auxiliary power supplies in industrial and consumer systems.

Technical Context

The board implements a non-isolated buck topology using VIPER122's internal 730 V MOSFET and fixed 60 kHz switching frequency with frequency jittering to suppress EMI peaks. Control is achieved via primary-side current-mode PWM with burst-mode operation enabling ultra-low no-load consumption.

Input rectification uses dual MRA4007 diodes; output rectification employs STTH1L06A fast recovery diodes. Regulation is maintained across full 85–265 VAC input and 0–200 mA load range, with measured output voltage deviation <±2% under line/load transients.

Key Specifications

Availability

STEVAL-VP12201B is available at Aetrix Electronics and suitable for industrial control panels, smart home hubs, IoT edge nodes, and appliance auxiliary power supply development requiring stable component supply and rapid prototyping capability.

Supply support for STEVAL-VP12201B 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 analog, MCU, power, and sensor solutions for automotive, industrial, and consumer markets.

This board belongs to ST's STEVAL (ST Evaluation) series-engineered to accelerate validation of ST's proprietary power ICs like VIPER122 in real-world AC/DC conversion applications with minimal external components.

FAQ

What is the maximum continuous output power of STEVAL-VP12201B?

The board delivers up to 3 W continuously (15 V × 200 mA) across its full input range (85–265 VAC). Derating is not required under standard ambient conditions (≤40 °C), and thermal performance has been validated per DB3988 test reports with no forced airflow.

Does STEVAL-VP12201B provide galvanic isolation?

No, STEVAL-VP12201B implements a non-isolated buck converter topology. The output shares a common reference with the rectified DC bus, making it unsuitable for applications requiring safety isolation. It is intended for auxiliary or internal supply rails where isolation is handled elsewhere in the system.

Can the output voltage be adjusted?

No-output voltage is fixed at 15 V by the resistor divider network (R4a/R4b) and internal error amplifier of VIPER122. The board is not designed for user-adjustable output; modification would require redesigning feedback components and revalidating regulation and stability.

Is a heatsink required for VIPER122 on this board?

No external heatsink is required. VIPER122 operates within its safe operating area (SOA) under all specified conditions, including full load at 230 VAC, as confirmed by thermal imaging in DB3988. The TO-220 package dissipates heat directly into the PCB copper pour.