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OPTOISOLATOR_DRIVES_1_A_POWER_TRANSIS_TOR_IC

2014-11-12 02:34  
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OPTOISOLATOR_DRIVES_1_A_POWER_TRANSIS_TOR_IC
Practically any standard optoisolator provides sufficient output to meet input current requirement of power transistor IC capable of handling 1 A. With no drive, R1 absorbs base current of at, holding it off. When power is applied to LED D1, less than 20μA from photo-diode D2 is sufficient to turn LM195 fully on. Supply can be up to 42 V.- Linear Applications, Vol. 2, National Semiconductor, Santa Clara, CA, 1976, AN-110, p 5.