A GaN-Based Synchronous Buck Converter for High Power Laser Diode Drive Applications

Laser Diodes are the essential components fordevelopment of high power laser systems. To operate these devices,highly efficient and high power density, compact, currentregulated switching converters are necessary. In this paper,Gallium Nitride (GaN) based synchronous buck converters arestudied for the application of laser diode driver. For this purpose,two synchronous buck converters one with Si-based the other onewith GaN-based are designed, simulated, tested and compared.With the application of GaN-based semiconductors, 96.6%efficiency and 9.1 W/cm3 power density is achieved for 11A, 28Vload at 700 kHz operating frequency.

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