NCP1336BDR2G

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. 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 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. Particularly well suited for adapter applications, the controller features two latch inputs: one dedicated to Over Temperature protection (OTP) which offers an easy means to connect a pull−down temperature sensor like an NTC, and a second one more classical that can be used to perform an accurate Over Voltage Protection. Finally, a brownout pin which stops the circuit operation in presence of a low mains condition is included.

Applications

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

Key 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