Optocoupler switch circuit diagram

Published:2011/9/15 2:12:00 Author:Rebekka | Keyword: Optocoupler switch | From:SeekIC

Figure 1 (b) shows off mode of the circuit. As no signal input, BG is stopped. When a signal is input, BG is conducted, due to BG's collector junction drops below 0.3V, which is much smaller than the light-emitting diode forward voltage, the light-emitting diode does not emit light without current flowing, then the resistance of a, b is large. It is equivalent to switch off . It is normally closed type. Visible, a, b ends are not limited by high or low potential in the circuit, but in theapplicationsof the circuit, we should make abe positive, b endbe negative, and U & ab> 3V, at the same time, Uab should be less than the BVceo of optical transistor.



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