The NCP1340 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 NCP1340 can enable no?load power consumption below 30 mW. The quasi?resonant current?mode flyback stage features a proprietary valley?lockout circuitry, ensuring stable valley switching. This system works down to the 6th valley and transitions to a frequency foldback mode to reduce switching losses. As the load decreases further, the NCP1340 enters quiet?skip mode to manage the power delivery. To help ensure converter ruggedness, the NCP1340 implements several key protective features such as internal brownout detection, a non?dissipative Over Power Protection (OPP) for constant maximum output power regardless of input voltage, a latched over voltage and NTC?ready over temperature protection through a dedicated pin, and line removal detection to safely discharge the X2 capacitors when the line is removed.

• QR Frequency Jittering
• New Quiet-Skip Technology
• Integrated HV Startup with Brownout Protection
• Valley Switching Operation with Valley Lockout
• Integrated X2 Capacitor Discharge Capability
• NTC Compatible Fault Pin
• High Drive Capability: -500 mA / +800 mA
• Latch input for OVP and OTP implementations