High-Frequency, Quasi-Resonant Flyback Regulator with Integrated 270mΩ GaN FET

The HFG610-45 is a quasi-resonant (QR) flyback regulator with an integrated GaN FET, which is suitable for high-performance and high-frequency designs. Unlike conventional QR flyback regulators, the HFG610-45’s frequency foldback guarantees high efficiency across the entire load range.

The device is a secondary-side regulation (SSR) based primary regulator, and must work with secondary-side feedback circuitry. The higher frequency shrinks the passive component size and achieves higher power density. The HFG610-45 integrates a high-voltage start-up circuit and an X-capacitor discharger circuit, in addition to an ultra-low quiescent current (IQ) in burst mode. The no-load power consumption can be less than 30mW.