NCP1343AMDCDBD1R2G

NCP1343 is a highly integrated quasi-resonant flyback controller suitable for designing high−performance off−line power converters. The NCP1343 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. As load decreases further, NCP1343 enters quie-skip mode to manage the power delivery while minimizing acoustic noise. Additionally, It integrates power excursion mode (PEM) to minimize transformer size in designs requiring high transient load capability. If transient load capability is not desired, the NCP1342 offers the same performance and features without PEM. To help ensure converter ruggedness, the NCP1343 implements several key protective features such as internal brownout detection, a non−dissipative overpower protection for constant maximum output power regardless of input voltage.

• Integrated high voltage start-up circuit with brownout detection
• 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
• Skip mode with quiet-skip technology for highest performance during light loads
• Minimized current consumption for no load power below 30mW, frequency jittering
• Latching or auto recovery timer based overload protection, adjustable overpower protection (OPP)
• Adjustable maximum frequency clamp, CCM operation during power excursion mode (PEM)