GaN flyback converter supplies up to 75 W
ST’s VIPerGaN50W houses a 700-V GaN power transistor, flyback controller, and gate driver in a compact 5×6-mm QFN package. The quasi-resonant offline converter delivers up to 75 W from high-line input (185–265 VAC) or 50 W across the full universal input range (85–265 VAC). It uses a proprietary technique that ensures chargers and power supplies operate silently at all load levels.
Along with zero voltage switching (ZVS), the VIPerGaN50W includes dynamic blanking time, which minimizes switching losses by limiting the frequency. It also offers adjustable valley synchronization delay to maximize efficiency at any input line and load condition. A valley-lock feature stabilizes skipped cycles to prevent audible switching noise.
At no load, the converter’s standby power drops below 30 mW thanks to adaptive burst mode, helping meet stringent ecodesign regulations. Advanced power-management features ensure the output-power capability and switching frequency remain stable, even when the supply voltage changes.
In production now, the VIPerGaN50W is priced from $1.09 each in lots of 1000 units.
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