Off lining switching power supply solution of OnSemiNCP107515W low power consumption

  
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The NCP1072/NCP1075 products integrate a fixed frequency current mode controller with a 700 V MOSFET. Available in a PDIP 7 or SOT 223 package, the NCP1072/5 offer 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 Se
Off lining switching power supply solution of OnSemiNCP107515W low power consumption - schematic

lf Supply eliminating the need for an auxiliary winding. Unlike other monolithic solutions, the NCP1072/5 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, Overvoltage Protection with auto recovery and AC input line voltage detection. For improved standby performance, the connection of an auxiliary winding stops the DSS operation and helps to reduce input power consum ption below 50 mW at high line.



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