The NCP1342 is a highly integrated

The NCP1342 is a highly integrated quasi−resonant flybackcontroller suitable for designing high−performance off−line powerconverters. With an integrated active X2 capacitor discharge feature,the NCP1342 can enable no−load power consumption below 30 mW.The NCP1342 features a proprietary valley−lockout circuitry,ensuring stable valley switching. This system works down to the 6thvalley and transitions to frequency foldback mode to reduce switchinglosses. As the load decreases further, the NCP1342 enters quiet−skipmode to manage the power delivery while minimizing acoustic noise.To ensure light load performance with high frequency designs, theNCP1342 incorporates Rapid Frequency Foldback with MinimumPeak Current Modulation to reduce the switching frequency quickly.To help ensure converter ruggedness, the NCP1342 implementsseveral key protective features such as internal brownout detection, anon−dissipative Over Power Protection (OPP) for constant maximumoutput power regardless of input voltage, a latched overvoltage andNTC−ready overtemperature protection through a dedicated pin, andline removal detection to safely discharge the X2 capacitors when theac line is removed.