Product Overview NCP1340: High-Voltage, Quasi-Resonant Controller Featuring Valley LockOut Switching For complete documentation, see the data sheet Product Description 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. Features Benefits • QR Frequency Jittering • New Quiet-Skip™ Technology • Integrated HV Startup with Brownout Protection • Reduces EMI Signature • Ensures Operation Outside Audible Range • Provides an efficient power-on source and protects agaisnts drops in input mains voltage • Maximizing the efficiency over the entire power range • Eliminates the need for a X2 resistors • Extra protection against high temperature or other fault conditions • Enables faster switching of primary-side MOSFET • Simple implementation of required protection functions • 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 Applications End Products • Medium or High Power AC-DC Adapters • Ultra High Density AC-DC Adapters • • • • Notebook Adpaters Flat TV SMPS Computer Power Supplies Phone and Tablet Adapters Part Electrical Specifications Product Compliance Status Topolog y Control Mode fsw Typ (kHz) StandUVLO by Mode (V) Short Circuit Protecti on Latch Soft Start VCC Max Drive (V) Cap. (mA) Packag e Type NCP1340B1DR2G Pb-free ProductPre view Flyback Current Mode Variable Yes 9 Yes Yes Yes 30 500 / 800 SOIC-8 ProductPre view Flyback Current Mode Variable Yes 9 Yes Yes Yes 30 500 / 800 SOIC9 NB Halide free NCP1340B3D1R2G Pb-free Halide free For more information please contact your local sales support at www.onsemi.com Created on: 6/30/2016