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
