onsemi NCP107x Off-Line Switchers

Unlike other monolithic solutions, the NCP107x Switcher is quiet by nature: during a nominal load operation. The NCP107x switches at one of the available frequencies (65kHz or 100kHz). When the output power demand diminishes, the Switcher automatically enters frequency foldback mode and provides excellent efficiency at light loads. When the power demand reduces further, the NCP107x enters into a skip mode to reduce the standby consumption down to a no-load condition.

The onsemi NCP1075, NCP1076, NCP1077, and NCP1079 Switchers feature various protection features. These protection features include a timer to detect an overload or a short-circuit event and Over-voltage Protection with auto-recovery. AC input line voltage detection prevents lethal runaway in low input voltage conditions (brown-out) and too high an input line (AC line over-voltage protection). This feature also allows over-power protection to compensate for all internal delays in high input voltage conditions and optimize the maximum output current capability. For improved standby performance, the connection of an auxiliary winding stops the DSS operation and helps to reduce input power consumption below 50mW at the high line.