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Chapter V : Optical Semiconductors : How to Use a Photocoupler Check

Step 4. Check each constant.
Consider whether there is sufficient margin for operating temperature, speed, lifetime design, tolerance of resistor, etc.

How to Use a Photocoupler Check

Temperature range ⇒ VF, CTR, allowable current, etc.

Load resistance ⇒ switching speed, influence of dark current, etc.

Allowable current
Allowable current
Dark current
Dark current
Switching time -RL
Switching time -RL

Confirmation of lifetime of the set

The optical output of the input LED of photocoupler decreases with the passage of time.

It is necessary to confirm that the characteristics are satisfied, for which purpose this deterioration during the lifetime target of the set must be included.

The aging variation of the optical coupler can be calculated from input current (IF) and ambient temperature.

Confirmation of lifetime of the set

Chapter V : Optical Semiconductors

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