Ncp1014: 10 W, 3-output Off-line Power Supply

This universal input, off-line switchmode power supply provides 3 mains isolated and regulated outputs. The converter circuit is a flyback based topology utilizing ON Semi’s NCP1014 monolithic switcher in an SOT-223 package. The output provides 5 and 12 volts with an additional negative 5 volt output that is isolated galvanically from the other two outputs. For simplicity, the AC input is half-wave rectified via D1 and conducted EMI is attenuated by C1 and L1. A standard Bridge Rectifier CAN be substituted if desired with lower line frequency ripple. U1 is power by an aux winding on T1 for very low standby power when the supply is unloaded. Voltage sensing, and feedback from the main 5 volt output is accomplished with a simple Zener Diode (Z1) and Optocoupler circuit. The transformer secondary utilizes a stacked winding configuration for the 5 and 12 volt outputs which provides good cross regulation with the 5 volt output. Tight regulation is provided on the isolated – 5 volt output via a 3-terminal Regulator
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Ncp1014: 10 W, 3-output Off-line Power Supply application circuits
Ncp1014: 10 W, 3-output Off-line Power Supply application circuits



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