HFG610-45

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. The HFG610-45 adopts MPS’s patented valley lock technique to restrain jumping from one valley to another valley during steady state operation, which can avoid audible noise completely. The wide supply voltage (VCC) range makes the device suitable for applications with a wide output voltage (VOUT) range without adding auxiliary winding. Advanced protections include primary-sense output over-voltage protection (ZCD OVP), primary-sense output under-voltage protection (ZCD UVP), VCC over-voltage protection (VCC OVP), output overload protection (OLP), internal brown-in/brownout (BI/BO), short-circuit protection (SCP), current-sense short protection (SSP), internal thermal shutdown (OTP), and under-voltage lockout (UVLO). The HFG610-45 is available in QFN-21 (5mmx6mm) and QFN-25 (7mmx7mm) packages.