Ncp1308: +/- 18 V Dual Output Power Supply

A low cost 45 watt nominal, 90 watt peak, dual +/- 18 volt output power supply is presented here for powering Audio Amplifiers or similar applications. Because the sum of the outputs are sensed, good voltage regulation and tracking is provided despite the extremely simple zener and Optocoupler voltage feedback circuit. The off-line power converter is implemented utilizing ON’s NCP1218 quasi-resonant (QR) flyback controller. This topology provides very high conversion efficiency and low noise generation because of the QR, zero voltage switching properties and the fact that the flyback switching operation is achieved in the discontinuous inductor current, critical conduction mode. The input circuit features common and differential mode conducted EMI filtering using off-the-shelf components. An auxiliary Vcc winding on the flyback transformer also provides for very low input standby power (less than 1 W) under no load conditions.
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Ncp1308: +/- 18 V Dual Output Power Supply application circuits
Ncp1308: +/- 18 V Dual Output Power Supply application circuits



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