Ncp1027: 10 W, 24 V / 5 V Off-line Power Supply

This design note features a low power, off-line dual output power supply intended for Industrial Control applications. ON Semiconductor’s NCP1027 integrated monolithic controller is implemented in a discontinuous conduction mode (DCM) flyback topology to provide 24 volts for powering motors or relays and an additional 5 volt output is provided utilizing the LM2574-5 Buck Switching Regulator This latter output is useful for Logic level power and is derived from the 24 Vdc main output. With the exception of T1, all magnetics are “off-the-shelf” parts from Coilcraft. The NCP1027 main controller features current mode control and ac mains “brown-out” sensing. Additional features of this chip not specifically used in this application include slope compensation for continuous conduction mode topologies and a power limit function (see NCP1027 data sheet at www.onsemi.com). The circuit also includes a conducted EMI Filter composed of C1, C9, and L1.
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Ncp1027: 10 W, 24 V / 5 V Off-line Power Supply application circuits
Ncp1027: 10 W, 24 V / 5 V Off-line Power Supply application circuits



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