The NCP1379 hosts a high-performance circuitry aimed to powering quasi-resonant converters. Capitalizing on a proprietary valley-lockout system, the controller shifts gears and reduces the switching frequency as the power loading becomes lighter. This results in a stable operation despite switching events always occurring in the drain-source valley. This system works down to the 4th valley and toggles to a variable frequency mode beyond, ensuring an excellent standby power performance. The controller includes an Over Power Protection circuit which clamps the delivered power at high-line. Safety-wise, a fixed internal timer relies on the feedback voltage to detect a fault. Once the timer elapses, the controller stops and enters auto-recovery mode, ensuring a low duty-cycle burst operation. To further improve the safety of the power supply, the NCP1379 features a pin to implement a combined brown-out/overvoltage protection. Particularly well suited for TVs power supply applications, the controller features a low startup voltage allowing the use of an auxiliary power supply to power the device. Features