Product Overview NCP1366: Low Power Offline Constant Current PWM Current-Mode Controller with High Voltage Startup Current Source For complete documentation, see the data sheet Product Description The NCP1366 offers a new solution targeting output power levels from a few watts up to 20 W in a universal-mains flyback application. Thanks to a novel method this new controller saves the secondary feedback circuitry for constant current regulation while achieving excellent line and load regulation with traditional opto coupler and TL431 voltage reference. The NCP1366 operates in valley lockout quasi-resonant peak current mode control mode at high load to provide high efficiency. When the power on the secondary side starts to diminish, the controller automatically adjusts the duty-cycle then at lower load the controller enters in pulse frequency modulation at fixed peak current with a valley switching detection. This technique allows keeping the output regulation with tiny dummy load. Valley lockout at the first 4 valleys prevent valley jumping operation and then a valley switching at lower load provides high efficiency. Features Benefits • 560-V Startup Current Source • No frequency clamp, 80 or 110 kHz Maximum Switching Frequency • Quasi-Resonant with Valley Switching Operation • Fixed Peak Current & Deep frequency foldback @ light load operation • Wide Operation VCC range (up to 28 V) • Cycle by Cycle peak current limit • CS & Vs/ZCD pin Short and Open Protection • Internal Temperature Shutdown • Constant Current Primary-side feedback eliminates secondary controller • ±10% Current Regulation For more features, see the data sheet Applications • Saves external HV FET or inefficient resistor divider • Prevent high frequency interference with a touchscreen • QR architecture offers high efficiency operation • Low light load consumption • • • • Design flexibility Safe operation Safe operation Safe operation End Products • AC-DC USB chargers for cell phones, tablets, and other portable devices • AC-DC USB chargers for cell phones, tablets, and other portable devices 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 NCP1366AABAYDR2 G Pb-free Active Flyback Current Mode Variable Yes 6.5 Yes Yes Yes 28 2000 / 1000 SOIC-7 NCP1366BABAYDR2 G Pb-free Active Flyback Current Mode Variable Yes 6.5 Yes Yes Yes 28 2000 / 1000 SOIC-7 Halide free Halide free For more information please contact your local sales support at www.onsemi.com Created on: 6/30/2016