STMicroelectronics STEVAL-DPSLLCK1

Overview

STEVAL-DPSLLCK1 from STMicroelectronics is a 3 kW digitally controlled full-bridge LLC resonant DC-DC converter evaluation kit featuring synchronous rectification, 48 V output at up to 62.5 A, 95.3% peak efficiency, 4 kV HF transformer isolation, and STM32F334-based digital control with CAN/USART/SMBus/opto-isolated serial interfaces.

For engineers reviewing the STEVAL-DPSLLCK1 datasheet, STEVAL-DPSLLCK1 pinout, STEVAL-DPSLLCK1 application, or STEVAL-DPSLLCK1 equivalent, this kit supports rapid validation of high-efficiency resonant power conversion in server PSUs, telecom rectifiers, and industrial AC-DC front-ends requiring ZVS operation, adaptive SR, and real-time telemetry via multiple isolated communication channels.

Technical Context

The kit implements a full-bridge LLC topology with MDmesh DM2 MOSFETs (STW70N60DM2) on the primary side and STripFET F7 MOSFETs (STP310N10F7) on the secondary, operating at resonant frequency (175 kHz) and closed-loop switching frequency (120–250 kHz) to achieve Zero Voltage Switching across load and line variations. The STM32F334R8T6 MCU provides high-resolution timing for precise frequency modulation and real-time protection response.

Digital control enables adaptive synchronous rectification, light-load burst mode, and comprehensive protection including input/output undervoltage/overvoltage, overtemperature, short-circuit, and airflow-modulated forced cooling. Galvanic isolation is maintained by a 4 kV-rated HF transformer and opto-coupled signal paths, while auxiliary power derives from a VIPer27HD flyback supplying regulated +5 V and +3.3 V rails.

Key Specifications

Availability

STEVAL-DPSLLCK1 is available at Aetrix Electronics and suitable for server power supplies, telecom rectifiers, and industrial AC-DC front-ends requiring stable component supply, design-in support, and production-ready reference implementation.

Supply support for STEVAL-DPSLLCK1 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 devices, analog ICs, and sensors for automotive, industrial, and consumer markets.

This kit belongs to ST's Digital Power Solutions product line, engineered to accelerate development of high-efficiency, digitally controlled AC-DC and DC-DC converters targeting datacenter, telecom infrastructure, and industrial power systems.

FAQ

What firmware and software tools are included with STEVAL-DPSLLCK1?

The kit ships with preloaded firmware for the STM32F334 microcontroller, supporting real-time voltage/current monitoring, closed-loop LLC frequency control, protection logging, and communication via CAN, USART, SMBus, and opto-isolated UART. ST provides the STSW-DPSLLCK1 firmware package, STM32CubeMX configuration tool, and ST Motor Control SDK-compatible libraries for customization.

Can STEVAL-DPSLLCK1 be used without an external PFC stage?

No - the kit accepts only 375–425 V DC input and lacks onboard power factor correction. It is designed to interface directly with the output of a front-end PFC module (e.g., STEVAL-PFCB2 or third-party 3-phase PFC). Operating below 375 V DC will trigger undervoltage lockout; exceeding 425 V DC activates overvoltage protection.

How is thermal management implemented on the power board?

The power board uses forced-air cooling with fan speed modulated based on measured heatsink temperature and output power. Temperature sensing is performed via LM19CIZ analog sensors, and the STM32F334 adjusts PWM duty cycle to the fan driver (via FAN_PWM signal) to maintain MOSFET junction temperatures within safe limits under all load conditions.

Does the kit support parallel operation or master-slave synchronization?

Yes - the digital control board provides dedicated synchronization signals (SYNC_IN/SYNC_OUT) and CAN bus support for coordinated multi-unit operation. Firmware includes configurable phase-shift control and load-sharing algorithms, enabling up to four units to operate in parallel with current balancing accuracy better than ±3% across 10–100% load range.