The ON Semiconductor series NCP1342 is a highly integrated quasi−resonant fly back controller suitable for designing high−performance off−line power converters. With an integrated active X2 capacitor discharge feature, the NCP1342 can enable no−load power consumption below 30 mW. To ensure light load performance with high frequency designs, the NCP1342 incorporates Rapid Frequency Fold back with Minimum Peak Current Modulation to reduce the switching frequency quickly.

Integrated High−Voltage Start-up Circuit with Brownout Detection
Integrated X2 Capacitor Discharge Capability
Wide VCC Range from 9 V to 28 V
28 V VCC Overvoltage Protection
Abnormal Overcurrent Fault Protection for Winding Short Circuit or Saturation Detection
Internal Temperature Shutdown
Valley Switching Operation with Valley−Lockout for Noise−Free Operation
Frequency Fold back with 25 kHz Minimum Frequency Clamp for Increased Efficiency at Light Loads