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STMicroelectronics STM32F334 | Demoboard STEVAL-DPSLLCK
3 kW Full Bridge LLC resonant digital power supply evaluation kit
Overview
| Topology | Buck Converter |
| Input voltage | 375-425 V |
| Switching frequency | 120-250 kHz |
| Output 1 | 48 V / 63 A |
| IC revision | 1 |
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.
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
Typical applications
- LLC Resonant Converter / AC-DC PSU for Server and Telecom
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | SW(mm) | L(mm) | Ti | To | VIN | VOut1(V) | IOut1(mA) | VOut2(V) | IOut2(mA) | Vaux(V) | ISAT(mA) | VT(V (AC)) | fswitch(kHz) | L(mH) | NPRI : NSEC : NAUX | W(mm) | H(mm) | Mount | Size | Z @ 100 MHz(Ω) | Zmax(Ω) | Test Condition Zmax | IR 2(mA) | RDC max.(Ω) | Type | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WA-SSTIE Steel Spacer Stud, metric, internal/external, 5 mm, 10 mm | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWA-SSTIE Steel Spacer Stud, metric, internal/external | SW5 mm | Length10 mm | Inner ThreadM3 | Outer ThreadM3 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | |||
 | WA-SSTII Steel Spacer Stud, metric, internal/internal, 5 mm, 10 mm | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWA-SSTII Steel Spacer Stud, metric, internal/internal | SW5 mm | Length10 mm | Inner ThreadM3 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | |||
 | WE-CBF SMT EMI Suppression Ferrite Bead, –, 1 mm | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CBF SMT EMI Suppression Ferrite Bead | – | Length1 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | Width0.5 mm | Height0.5 mm | MountSMT | Size0402 | Impedance @ 100 MHz470 Ω | Maximum Impedance1200 Ω | Maximum Impedance300 MHz | Rated Current 2620 mA | DC Resistance0.45 Ω | TypeHigh Speed | ||||
 | WE-OLSTM Offline Flyback Transformers, –, 18.5 mm | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-OLSTM Offline Flyback Transformers | – | Length18.5 mm | – | – | Input Voltage 265 - 297 V (AC) | Output Voltage 15 V | Output Current 1500 mA | Output Voltage 212 V | Output Current 2220 mA | Auxiliary Voltage15 V | Saturation Current420 mA | Insulation Test Voltage3000 V (AC) | Switching Frequency 115 | Inductance2.3 mH | Turns Ratio19.14:1:2.43:3 | Width16.5 mm | Height18.8 mm | MountTHT | SizeEE16/7/5 | – | – | – | – | – | – |