深圳市中立信电子科技有限公司

NCP1380BDR2G

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

开关控制器 QUASI-RES CUR MODE CONTRL

NCP1380BDR2G 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 or Latched Internal Output Short−Circuit Protection

• Fixed Internal 80 ms Timer for Short−Circuit Protection

• Combined Overvoltage and Overtemperature Protection (A and B

Versions)

• Combined Overvoltage Protection and Brown−Out (C and D

Versions)

• +500 mA/−800 mA Peak Current Source/Sink Capability

• Internal Temperature Shutdown

• Direct Optocoupler Connection

• Extended VCC Range Operation Up to 28 V

• Extremely Low No−Load Standby Power

• SO−8 Package

• These Devices are Pb−Free and are RoHS Compliant

NCP1380BDR2G Typical Applications

• High Power ac−dc Converters for TVs, Set−Top Boxes etc.

• Offline Adapters for Notebooks

The NCP1380BDR2G NCP1380 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.