The HFG611-45 is a quasi-resonant (QR) flyback regulator with an integrated GaN FET, which is suitable for high-performance and high-frequency designs.

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 HFG611-45 integrates a high-voltage start-up circuit and an X-capacitor discharger circuit, in addition to an ultra-low quiescent current (I_Q) during burst mode. The no-load power consumption can be below 30mW.

The HFG611-45 adopts MPS’s patented valley lock technique to restrain the valley jumping from one to another during steady state operation and help avoid audible noise. The wide supply voltage (V_CC) range makes the device suitable for applications with a wide output voltage (V_OUT) range without adding auxiliary winding.

Advanced protections include primary-sense output over-voltage protection (ZCD OVP), primary-sense output under-voltage protection (ZCD UVP), V_CC over-voltage protection (V_CC OVP), output overload protection (OLP), internal brown-in and brownout (BI and BO, respectively), short-circuit protection (SCP), internal thermal shutdown (OTP), and under-voltage lockout (UVLO).

The HFG611-45 is available in QFN-21 (5mmx6mm) and QFN-25 (7mmx7mm) packages.