NCP1336A

NCP1336A/B Quasi-Resonant Current Mode Controller for High Power Universal Off-Line Supplies The NCP1336 hosts a high−performance circuitry aimed to www.onsemi.com powering quasi−resonant converters. Capitalizing on a novel QUASI−RESONANT PWM valley−lockout system, the controller shifts gears and reduces the CONTROLLER FOR HIGH POWER switching frequency as the power loading becomes lighter. This AC−DC WALL ADAPTERS 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 takes benefit of a high−voltage start−up current source to provide a quick and lossless power−on sequence. To improve the safety in overload situations, the controller includes an Over Power Protection circuit which clamps the delivered power at high−line. Safety−wise, an adjustable timer relies on the feedback voltage to detect a fault. On version B, this fault triggers a triple−hiccup on the 14 1 SO−14 CASE 751AN SUFFIX O MARKING DIAGRAM 14 NCP1336xG AWLYWW 1 A = Assembly Location x = A or B WL = Wafer Lot VCC pin which naturally reduces the average input power drawn by the converter. On version A, when a fault is detected, the controller is latched−off. Y = Year WW = Work Week G = Pb−Free Package Particularly well suited for adapter applications, the controller features two latch input...