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Chapter V : Optical Semiconductors : How to Use a Photocoupler “Input Current”

Step 1. Design LED input current and input resistor RIN.

How to Use a Photocoupler “Input Current”

What is the input current (IF) of the photocoupler?

It is determined by (1) input power supply voltage (5 V), (2) current limiting resistor (RIN), and (3) forward voltage (VF) of LED.

From the specification example, determine the current limiting resistor and the input current (IF).

RIN=(VCC-VF)/IF=(5 V-1.3 V)/10 mA=370 Ω

Specification example

Chapter V : Optical Semiconductors

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