NCP1379

NCP1379 Quasi-Resonant Current-Mode Controller for High-Power Universal Off-line Supplies 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 Quasi−Resonant Peak Current−Mode Control Operation Valley Switching Operation with Valley−Lockout for Noise−Immune Operation Frequency Foldback at Light Load to Improve the Light Load Efficiency Adjustable Over Power Protection Auto−Recovery Output Short−Circuit Protection Fixed...