Opto-emitter anode is connected to 5V supply (Logic1). The cathode is connected to the buffer output. When logic 1 is given to the input of LS7406 we get logic 0 as the output. Sink current of opto-emitter is lower than that of LS7406. Now this opto-emitter emits IR rays. This drives the phototransistor whose collector is forced to 24V. When IR rays are emitted from the opto-emitter the phototransistor conducts. The collector to emitter resistance becomes low. So the 24V will appear at emitter voltage. It is given as input for the pre driver (SL100).
Monday, May 12, 2008
Opto emitter anode
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