1A transistor integrated circuit driven by photoisolator

Published:2011/4/27 9:42:00 Author:Nicole | Keyword: transistor, opto-electrical isolator drive | From:SeekIC

Any standard photoelectric isolator can produce enough output to meet the input current requirement of 1A power transistor. When it is without drive singal, R1 pulls in the Q1's base current, to keep it cut off. To add power supply to LED D1, then LM195 will be absolutely conducted by the insufficient 20μA current which is produced by photodiode D2. The power voltage can reach 42V.



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