STMicroelectronics STEVAL-VP22201B

Overview

STEVAL-VP22201B from STMicroelectronics is an evaluation board implementing a non-isolated 5 V / 360 mA buck converter based on the VIPer222XSTR high-voltage offline controller with integrated 730 V Power MOSFET and current-mode PWM control, operating from universal AC input (85–265 VAC, 50–60 Hz), optimized for auxiliary power supply in space-constrained industrial and consumer systems.

For engineers reviewing the STEVAL-VP22201B datasheet, STEVAL-VP22201B pinout, STEVAL-VP22201B application, or STEVAL-VP22201B equivalent, key selection criteria include no-load standby consumption (<18 mW at 230 VAC), fixed 30 kHz switching with frequency jittering for Class B EMI compliance, tight line/load regulation, burst-mode operation, and minimal BOM count using VIPer222XSTR.

Technical Context

The board implements a primary-side regulated, discontinuous conduction mode (DCM) buck topology with VIPer222XSTR's internal current-mode PWM controller and 730 V avalanche-rated MOSFET, eliminating need for optocoupler or secondary-side feedback. Control loop stability is achieved via embedded error amplifier and external RC compensation network (R4a/R4b, C5).

Burst-mode operation dynamically reduces average switching frequency under light/no-load conditions to suppress switching losses, enabling <18 mW standby power at 230 VAC. Frequency jittering spreads spectral energy across ±4% of 30 kHz nominal frequency to meet IEC 55022 Class B conducted EMI limits with reduced external filter components.

Key Specifications

Availability

STEVAL-VP22201B is available at Aetrix Electronics and suitable for industrial auxiliary power supplies, smart meter auxiliary rails, and IoT gateway low-power standby circuits requiring stable component supply, rapid prototyping validation, and reference design traceability.

Supply support for STEVAL-VP22201B 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, sensors, and analog/mixed-signal devices for automotive, industrial, and consumer applications.

This board belongs to ST's STEVAL evaluation platform series, developed to accelerate adoption of VIPerPlus offline converters by providing fully tested, EMC-compliant reference designs with complete schematics, layout files, and test reports.

FAQ

What is the maximum ambient temperature for continuous operation?

The STEVAL-VP22201B is rated for continuous operation up to +70 °C ambient, verified per DB4123 test conditions with natural convection cooling and standard FR4 PCB layout. Thermal performance relies on proper copper pour area under VIPer222XSTR's exposed pad and minimal thermal resistance path to ambient.

Does this board support output overvoltage protection (OVP)?

No - the STEVAL-VP22201B implements only primary-side overcurrent protection via VIPer222XSTR's internal cycle-by-cycle current limiting and thermal shutdown. It lacks dedicated OVP circuitry; output voltage clamping depends on Zener diode D5 (12 V) and LDO post-regulation if used downstream.

Can the output voltage be adjusted to 3.3 V?

Yes - output voltage can be reconfigured to 3.3 V by replacing R2 (feedback divider upper resistor) with 12.7 kΩ and R1 with 10 kΩ, maintaining same divider ratio and ensuring VIPer222XSTR's EA input remains within 1.22 V ±1% regulation window per datasheet Section 7.2.

Is the board compliant with IEC 62368-1 safety standards?

No - as a non-isolated evaluation board, STEVAL-VP22201B does not provide reinforced insulation or creepage/clearance meeting IEC 62368-1 Annex G requirements. It is intended for lab evaluation only; end-product safety certification requires full system-level assessment including enclosure, spacing, and fault testing.