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SWITCHING POWER SUPPLY DESIGN REVIEW - …
SWITCHING POWER SUPPLY DESIGN REVIEW60 WATT FLYBACK REGULATORBy Raoji Patel and Glenn FritzThis paper gives a practical example of the DESIGN of an off-line SWITCHING POWER governing the choice of a discontinuous flyback topology are discussed. The designuses a pulsed-width modulation (PWM) control scheme implemented with a UnitrodeUC3840 IC. This chip's voltage-feed-forward feature is used to achieve improved outputregulation. The paper discusses closing the control loop to achieve both stability andadequate dynamic regulation, and provides guidelines for transformer DESIGN and compo-nent circuit developed herein operates from a l17V (::!::15%), 60 Hz line and meets thefollowing objectives:I. Output voltages:a. +5V, :!::5%: voltage: 50mV p-p maximumb. +12V, :!::3%: voltage: lOOmV p-p maximum2. Fificiency: 70% minimum3. Line isolation: 3750 VThese objectives are met by using a flyback converter topology with a MOSFET powerswitch operating at 80kHz. The DESIGN features primary side SELECTION OF FLYBACK TOPOLOGYThe flyback, when compared to other SWITCHING regulator topologies, has several cost andperformance advantages:Cost Advantages:1.
SWITCHING POWER SUPPLY DESIGN REVIEW 60 WATT FLYBACK REGULATOR By Raoji Patel and Glenn Fritz This paper gives a practical example of the design of an off-line switching power supply.
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