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SFC2741C

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FOD2741A, FOD2741B, FOD2741C Optically Isolated Error Amplifier Features Description ■ Optocoupler, precision reference and error amplifier in The FOD2741 Optically Isolated Amplifier consists of the popular KA431 precision programmable shunt reference and an optocoupler. The optocoupler is a gallium arsenide (GaAs) light emitting diode optically coupled to a silicon phototransistor. It comes in 3 grades of reference voltage tolerance = 2%, 1%, and 0.5%. ■ ■ ■ ■ ■ ■ single package 2.5V reference CTR 100% to 200% 5,000V RMS isolation UL approved E90700, Volume 2 CSA approval 1296837 VDE approval 40002463 BSI approval 8702, 8703 Low temperature coefficient 50ppm/°C max. FOD2741A: tolerance 0.5% FOD2741B: tolerance 1% FOD2741C: tolerance 2% Applications ■ Power supplies regulation The Current Transfer Ratio (CTR) ranges from 100% to 200%. It also has an outstanding temperature coefficient of 50 ppm/°C. It is primarily intended for use as the error amplifier/reference voltage/optocoupler function in isolated AC to DC power supplies and DC/DC converters. When using the FOD2741, power supply designers can reduce the component count and save space in tightly packaged designs. The tight tolerance reference eliminates the need for adjustments in many applications. The device comes in a 8-pin dip white package. ■ DC to DC converters Functional Bock Diagram NC Package Outlines 1 8 LED C 2 7 FB E 3 6 COMP 8 1 8 NC 4 ©2004 Fairchild Semiconductor Corporation FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1 5 GND 8 1 1 www.fairchildsemi.com FOD2741A, FOD2741B, FOD2741C — Optically Isolated Error Amplifier August 2008

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