400V ? 12V/500W High Frequency Resonant Converter Reference Design Using High Voltage GaN Devices
400V ? 12V/500W High Frequency Resonant Converter Reference Design Using High Voltage GaN Devices (PMP20289)
The PMP20289 was built and tested to verify the performance of a high frequency (>400kHz nominal switching frequency) LLC series resonant converter (LLC-SRC) implemented with Texas Instrument’s high voltage GaN FETs under nominal (390V to 12V) voltage conversion. The digital controller UCD3138A is used along with the UCD7138 SR controller to optimize LLC-SRC efficiency. TI’s high voltage direct drive GaNFET LMG3410 is used to enable fast switching and be able to minimize dead-time between half-bridge switches. The test results show that 96.8% peak efficiency is achieved at 24A load and 96.3% efficiency is achieved at 42A full load with a switching frequency over 350kHz in a 390V to 12V conversion.
400V – 12V/500W high frequency LLC series resonant converter 350kHz resonant frequency and 500kHz switching frequency at 400V to 12V conversion Utilize TI high voltage direct drive GaN FETs as input switches Optimized LLC SR conduction with UCD7138/UCD3138A Achieve peak 96.8% efficiency
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