Controller, Quasi Resonant, Current Mode, Low Standby, with PFC Shutdown

Housed in a SO-14 package, the NCP1382 includes everything needed to build rugged and efficient Quasi-Resonant (QR) Switching Power Supplies. When powered by a front-end Power Factor Correction circuitry, the NCP1382 automatically disconnects the PFC controller in low output loading conditions (with an adjustable level), thus improving the standby power. This is particularly well suited for medium to high power offline applications, e.g. notebook adapters. When the current setpoint falls below a given value, e.g. the output power demand diminishes, the IC automatically enters the so-called skip cycle mode and provides excellent efficiency at light loads. Because this occurs at an adjustable low peak current together with a proprietary Soft-Skip technique, no acoustic noise takes place. Skip cycle also offers the ability to easily select the maximum switching frequency at which foldback and standby take place. The NCP1382 also features several efficient protection options like a) a short-circuit overload detection independent of the auxiliary voltage b) an auto-recovery brown-out detection and c) an input to externally latch the circuit in case of Overvoltage Protection or Over Temperature Protection.. NCP1381 vs. NCP1382: Latchoff Level On the Skip Adjustment Pin: NCP1381 3.5 V Typ. NCP1382 2.5 V Typ