NCP1342ENDCEAD1R2G

NCP1342 is a highly integrated quasi-resonant flyback 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 30mW. The NCP1342 features a proprietary valley-lockout circuitry, ensuring stable valley switching. This system works down to the 6th valley and transitions to frequency foldback mode to reduce switching losses. To help ensure converter ruggedness, the NCP1342 implements several key protective features such as internal brownout detection, a no-dissipative over power protection (OPP) for constant maximum output power regardless of input voltage, a latched overvoltage and NTC-ready overtemperature protection through a dedicated pin. Applications include notebook adapters, flat TV SMPS, computer power supplies, phone, tablet adapters, medium or high power AC-DC adapters, ultra high density AC-DC adapters and USB PD compliant.

• Integrated high voltage start-up circuit with brownout detection
• 9V to 28V wide VCC range, 28V VCC overvoltage protection
• Line removal detection to safely discharge the X2 capacitors when the ac line is removed
• 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 foldback with 25KHz minimum frequency clamp for increased efficiency at light loads
• Rapid frequency foldback for fast reduction of switching frequency at light loads
• Fault pin for severe fault conditions, NTC compatible for OTP4ms soft−start timer
• Adjustable overpower protection (OPP), adjustable maximum frequency clamp