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                            1.8KW high frequency and power density DC-DC converter

                            Release time:

                            2023-04-23 15:51

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                            PROJECT INTRODUCTION
                            The reference design is a high frequency 1.8kW DC/DC converterbased on SiC device with input voltage range 300-400Vdc, ratedoutput 12V/50A. Synchronous LLC topology and main controllerFAN7688 used selected, with peak current control, cycle-by-cyclecurrent limit, and output OvP & short circuit protections. Powerdensity reaches 190W/inch^3。
                             
                            DESIGN SPECIFICATION
                            Input Voltage 3oovdc-420Vdc
                            Output Voltage 12Vdc
                            Rated Power 18Oow
                            Switching frequency 120~40OKHz
                            System Efficiency 97.14%@25%load: 93.4%afull load

                             

                            FEATURES

                            · High frequency, small size, power density is 190W/inch^3;

                            · Peak current control mode, cycle-by-cycle current limit;

                            · No electrolytic capacitor, longer life and higher reliability:

                            · Full protection,including input OVP & UVP, output OVP & OCP, short circuit protection

                             

                            MAIN TOPOLOGY

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                            MAIN DEVICES
                             
                            Function Part Number Brand
                            Primary MOS C3MOO650903 Wolfspeed
                            Secondary MOSFET Driver IXDN6o9SIA 力特

                             

                             MEASUREMENT RESULTS AND WAVEFORMS

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                            Efficiency vs.Io

                             

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                            Working waveform @20% load

                             

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                            Working waveform @full load, Pri Vgs&Sec Vgs&Ipri&Sec Vds

                             

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                            Working waveform, Pri Vgs&Sec Vgs &Ipri&Pri Vds

                             

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                            10% load to 90% load

                             

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                            90% load to 10% load

                             

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                            Soft start @ no load

                             

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                            Soft start @ full load

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                            1.8KW high frequency and power density DC-DC converter

                            2023-05-24

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