Product Overview NCP1379: Controller, Quasi-Resonant, Current Mode For complete documentation, see the data sheet Product Description The NCP1379 is a high performance device aimed at powering quasi-resonant converters. Capitalizing on a proprietary valley lockout system, the controller shifts gears and reduces the switching frequency as the power loading becomes lighter. This results in a stable operation despite switching events always triggering in the drain-source valley. This system works down to the 4th valley and toggles to a variable frequency mode beyond, ensuring an excellent standby power performance. To improve the safety in the overload situations, the controller includes an Over Power Protection (OPP) circuit which clamps the delivered power at high-line. Safety-wise, a fixed internal timer relies on the feedback voltage to detect a fault. Once the timer elapses, the controller stops and enters auto-recovery mode, ensuring a low duty-cycle burst operation. Particularly well suited for TV power supply applications, the controller features a low startup voltage allowing use of an auxiliary supply to power the device. Features • • • • • • • Benefits Quasi-resonant peak current mode control operation Valley switching operation with valley lockout Frequency foldback at light load Adjustable overpower protection Auto-recovery output short circuit protection Fixed internal 80 ms timer for short circuit protection VCC range operation up to 28 V • High efficiency operation • Provides for noise-immune operation • Improves light load efficiency Applications End Products • Auxiliary power supplies (flat TV, appliances) • Power AC-DC converters for adapters, TVs and set top boxes 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 NCP1379DR2G Pb-free Active Flyback Current Mode Variable Yes Yes Yes Yes 28 SOIC-8 Halide free 9 500 / 800 Application Diagram For more information please contact your local sales support at www.onsemi.com Created on: 6/30/2016