The STMicroelectronics VIPerGaN50 simplifies building single-switch flyback converters up to 50 W and integrates a 650 V gallium-nitride (GaN) power transistor for enhanced energy efficiency and miniaturisation.
With its single-switch topology and high integration, including current-sensing and protection circuitry built-in, the VIPerGaN50 comes in a compact and low-cost 5 x 6 mm package. The speed of the integrated GaN transistor allows a high switching frequency with a small and lightweight flyback transformer. Minimal additional external components are needed to design an advanced, high-efficiency switched-mode power supply (SMPS).
The converter operates in multiple modes to maximise efficiency at all line and load conditions. At heavy load, quasi-resonant (QR) operation with zero-voltage switching minimises turn-on losses and electromagnetic emissions (EMI). At reduced load, valley skipping limits switching losses and leverages ST’s proprietary valley lock to prevent audible noise.
Built-in features ensure safety and reliability, including output over-voltage protection, brown-in and brown-out protection and input over-voltage protection.
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