Quasi-Resonant Current Mode Controller for High Power Universal Off-Line Supplies

The NCP1336 hosts a high−performance circuitry aimed to powering quasi−resonant converters. Capitalizing on a novel
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.

FEATUREs
•Quasi−Resonant Peak Current−Mode Control Operation
•Valley Switching Operation with Valley−Lockout for Noise−Immune Operation
•Internal 5 ms Soft−Start
•Loss−Free Adjustable Over Power Protection
•Auto−Recovery or Latched Internal Output Short−Circuit Protection
•Adjustable Timer for Improved Short−Circuit Protection
•Overvoltage and Overtemperature Protection Inputs
•Brownout Input
•−500 mA/+800 mA Peak Current Source/Sink Capability
•Internal Temperature Shutdown
•Direct Optocoupler Connection
•3 s Blanking Delay to Ignore Leakage Ringing at Turn−Off
•Extremely Low No−Load and Standby Power
•SO14 Package
•These are Pb−Free Devices
•This Device uses Halogen−Free Molding Compound

Typical Applications
•High Power ac−dc Converters for TVs, Set−Top Boxes etc
•Offline Adapters for Notebooks