
Features
•Power ratings:
– input DC voltage: 375 V to 425 V
– output voltage: 48 V
– maximum output current: 62.5 A
– output power: 3 kW
– peak efficiency: 95.3%
– HF transformer isolation voltage: 4 kV
• Resonant and switching frequencies:
– max DC-DC switching frequency: 380 kHz (at startup)
– closed loop switching frequency: 120 kHz to 250 kHz
– resonant frequency: 175 kHz
• Protection mechanisms:
– undervoltage and overvoltage protection on input and output
– overtemperature protection
– short-circuit protection
– forced cooling with air flow speed modulation according to the output power
and temperature
• Efficiency:
– adaptive synchronous rectification
– light load burst mode
• Digital control with STM32F334 microcontroller
Description
The STEVAL-DPSLLCK1 is a digitally controlled 3 kW full bridge LLC resonant DC-
DC converter with output synchronous rectification. The kit consists of a power board,
digital control board, adapter board, and firmware modules.
The full bridge primary section of the LLC converter is based on MDmesh DM2
Power MOSFETs for high efficiency performance. The PWM switching frequency is
digitally controlled to regulate the output voltage. The converter operates at near
resonant frequencies to maximize efficiency and achieve Zero Voltage Switching
(ZVS) over the entire operating range.
The HF transformer provides galvanic isolation and magnetic integration of the
inductive elements for a compact design.
Synchronous rectification (SR) with STripFET F7 Power MOSFETs is employed on
the secondary side to reduce conduction losses.
The STM32F334 microcontroller on the digital control board embeds a high
resolution timer for finer regulation and can communicate status information via
USART, CAN, SMBus, and opto-coupled serial communication.
Both the primary and secondary sections are supplied by an off-line flyback circuit
based on VIPer27HD which provides regulated voltages to the control board, the
gate driver ICs and the signal conditioning circuits.
You can connect a PFC to the power board and extend communication and
interfacing with the supplied adapter board.
Product summary
Bill of Materials and Schematics
3 kW power supply
evaluation kit
STEVAL-
DPSLLCK1
Main components and software
STM32F3x4
microcontroller STM32F334
MDmesh DM2
Power MOSFET STW70N60DM2
STripFET F7 Power
MOSFET STP310N10F7
off-line high voltage
converter VIPER27
Further reading and support
Applications Power supplies and
converters
Community and
blogs
ST Community
ST blog
3 kW Full Bridge LLC resonant digital power supply evaluation kit
STEVAL-DPSLLCK1
Data brief
DB3560 - Rev 2 - March 2019
For further information contact your local STMicroelectronics sales office.
www.st.com