Fairchild FPS Series Design Manual
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17www.fairchildsemi.com/fpsFPS™ Design GuideExamples of Typical Application Circuits24V/100mA outputLp=1700uH 100/25 EF20 (on Vogt Fi324 core)85V-265VAC from applianceinput filter stagefsw=134kHz148512VCC 5DRAIN 7VSTR 8GND1GND2GND3VFB4122 311234FS1230V/250mAC20633nF50VC10433nF50VT1VOGT EF20D201SB180R101C1022.2nF1000VC300YCAP250VR2011K0.25WD1001N4007C10110uF400V+CONN1B2P3-VHR2021K0.25WIC1FSD200MC1031uF50V+R2033K0.25WR20491K0.25WCONN2B2P-VHL100IC3KA431LZIC2H11A817A.WD102UF4007D1011N4007R102100K0.6WR20511K0.25WC201100uF50V+C10010uF400V+L101In this converter, isolation is provided by the transformer and the H11A817A optocoupler. Output accuracy is improved using theKA431 voltage reference. The values R201, R203, C206, R204 and C104 set the closed loop control parameters and performance.Using a Schottky diode is a cost-effective method of improving efficiency where needed.• Feedback circuit using KA431 reference and H11A817A optocoupler– More accurate regulation over line, load and temperature than with a Zener diode• Schottky diode used in output stage– Cost-effective means of improving efficiency• Integrated soft start function– Prevents power surges during switch-on timeFairchild Devices DescriptionFSD200M Fairchild Power Switch (0.3A/134kHz)KA431 2.5V Reference (2.5V)H11A817A Transistor OptocouplerSB180 Schottky Diode (1A/80V)UF4007 Fast Recovery Diode (1A/1000V)1N4007 General Purpose Diode (1A/1000V)2.5W Single Output Isolated Flyback Using FSD200 with KA431 ReferenceTypical Application – Isolated main or standby power supplies for household appliances |
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