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Chapter V : Optical Semiconductors : How to Use a Photocoupler

Design example of signal interface using phototransistor coupler

The figure below shows an example of an interface circuit that converts a 5 V signal into a 10 V signal using a phototransistor coupler.

How should we design the resistor RIN on the LED input side and the resistor RL on the phototransistor output side?

And how should we select CTR of the phototransistor coupler?

We will explain from the next page with the following steps.

Step 1. Design of LED input-current IF and input-side resistor RIN

Step 2. Calculate output current from IF and CTR

Step 3. Design of output-side resistor RL

Step 4. Check each designed constant

Interface circuit of DC5V and DC10V
Interface circuit of DC5V and DC10V

Chapter V : Optical Semiconductors

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