NCP1077A

DATA SHEET www.onsemi.com Enhanced Off-line Switcher for Robust and Highly Efficient Power Supplies NCP1075A/B, NCP1076A/B, NCP1077A/B, NCP1079A/B MARKING DIAGRAMS PDIP−7 (PDIP−8 LESS PIN 6) CASE 626A P107xPuzy AWL YYWWG The NCP107xuz products integrate a fixed frequency current mode controller with a 700 V MOSFET. Available in a two different pin−out of the very common PDIP−7 package, the NCP107xuz offers a high level of integration, including soft−start, frequency−jittering, short−circuit protection, skip−cycle, a maximum peak current set−point, ramp compensation, and a dynamic self−supply (DSS, eliminating the need for an auxiliary winding). Unlike other monolithic solutions, the NCP107xuz is quiet by nature: during nominal load operation, the part switches at one of the available frequencies (65, 100 or 130 kHz). When the output power demand diminishes, the IC automatically enters frequency foldback mode and provides excellent efficiency at light loads. When the power demand reduces further, it enters into a skip mode to reduce the standby consumption down to a no load condition. Protection features include: a timer to detect an overload or a short−circuit event, Over−voltage Protection with auto−recovery. Ac input line voltage detection prevents lethal runaway in low input voltage conditions (Brown−out) as well as too high an input line (Ac line Over−voltage Protection). This also allows an Over−power Protection to compensate all internal delays in high input voltag...