Quasi-Resonant Current-Mode Controller
NCP1379
Quasi-Resonant
Current-Mode Controller for
High-Power Universal
Off-line Supplies
The NCP1379 hosts a high−perf...
Description
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...
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