P1011AP10 DIP7 ORIGINAL

plied MonolithicSwitcher for Low Standby-Power Offline SMPSNCP1010, NCP1011,NCP1012, NCP1013,NCP1014The NCP101X series integrates a fixed−frequency current−modecontroller and a 700 V MOSFET. Housed in a PDIP−7 or SOT−223package, the NCP101X offers everything needed to build a rugged andlow−cost power supply, including soft−start, frequency jittering,short−circuit protection, skip−cycle, a maximum peak current setpointand a Dynamic Self−Supply (no need for an auxiliary winding).Unlike other monolithic solutions, the NCP101X is quiet by nature:during nominal load operation, the part switches at one of the availablefrequencies (65 − 100 − 130 kHz). When the current setpoint fallsbelow a given value, e.g. the output power demand diminishes, the ICautomatically enters the so−called skip−cycle mode and providesexcellent efficiency at light loads. Because this occurs at typically 1/4of the maximum peak value, no acoustic noise takes place. As a result,standby power is reduced to the minimum without acoustic noisegeneration.Short−circuit detection takes place when the feedback signal fadesaway, e.g. in true short−circuit conditions or in broken Optocouplercases. External disabling is easily done either simply by pulling thefeedback pin down or latching it to ground through an inexpensiveSCR for complete latched−off. Finally soft−start and frequencyjittering further ease the designer task to quickly develop low−cost androbust offline power supplies.For improved standby performance, the connection of an auxiliarywinding stops the DSS operation and helps to consume less than100 mW at high line. In this mode, a built−in latched overvoltageprotection prevents from lethal voltage runaways in case theOptocoupler would brake.