Click to expand full text
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.
NCP1379 Datasheet
