Onsemi NCP1070

Description

The NCP107x products integrate a fixed frequency current mode controller with a 700 V MOSFET. Available in a PDIP−7 or SOT−223 package, the NCP107x 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 Self−Supply (eliminating the need for an auxiliary winding). Unlike other monolithic solutions, the NCP107x 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 consumption below 50 mW at high line.

Features

• Built−in 700 V MOSFET with RDS(on) of 4.7  (NCP1076/77) /11  (NCP1072/75) / 22  (NCP1070/71)
• Large Creepage Distance Between High−voltage Pins
• Current−Mode Fixed Frequency Operation – 65 / 100 / 130 kHz
• Peak Current: NCP1070/72 with 250 mA, NCP1071 with 350 mA,NCP1075 with 450 mA, NCP1076 with 650 mA and NCP1077 with800 mA
• Fixed Ramp Compensation
• Skip−Cycle Operation at Low Peak Currents Only: No AcousticNoise!
• Dynamic Self−Supply: No Need for an Auxiliary Winding
• Internal 1 ms Soft−Start
• Auto−Recovery Output Short Circuit Protection withTimer−Based Detection
• Auto−Recovery Overvoltage Protection with AuxiliaryWinding Operation
• Frequency Jittering for Better EMI Signature, IncludingFrequency Foldback Mode
• No Load Input Consumption < 50 mW
• Frequency Foldback to Improve Efficiency at LightLoad
• Internal Temperature Shutdown
• These are Pb−Free Devices

Typical applications

• Auxiliary / Standby Isolated Power Supplies WhiteGoods / Smart Meter / E−Meter

More information

• Datasheet
• IC product information