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This literature is subject to all applicable copyright laws and is not for resale in any manner.FOD2741A, FOD2741B, FOD2741C Optically Isolated Error Amplier August 2008 FOD2741A, FOD2741B, FOD2741C Optically Isolated Error Amplifier Features Description Optocoupler, precision reference and error amplifier in The FOD2741 Optically Isolated Amplifier consists of the single package popular KA431 precision programmable shunt reference and an optocoupler. The optocoupler is a gallium ars- 2.5V reference enide (GaAs) light emitting diode optically coupled to a CTR 100% to 200% silicon phototransistor. It comes in 3 grades of reference 5,000V RMS isolation voltage tolerance = 2%, 1%, and 0.5%. UL approved E90700, Volume 2 The Current Transfer Ratio (CTR) ranges from 100% to CSA approval 1296837 200%. It also has an outstanding temperature coefficient VDE approval 40002463 of 50 ppm/C. It is primarily intended for use as the error BSI approval 8702, 8703 amplifier/reference voltage/optocoupler function in iso- Low temperature coefficient 50ppm/C max. lated AC to DC power supplies and DC/DC converters. FOD2741A: tolerance 0.5% When using the FOD2741, power supply designers can FOD2741B: tolerance 1% reduce the component count and save space in tightly FOD2741C: tolerance 2% packaged designs. The tight tolerance reference elimi- nates the need for adjustments in many applications. Applications The device comes in a 8-pin dip white package. Power supplies regulation DC to DC converters Functional Bock Diagram Package Outlines NC LED 1 8 8 1 C FB 2 7 E COMP 3 6 8 8 NC GND 4 5 1 1 2004 Fairchild Semiconductor Corporation www.fairchildsemi.com FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1