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About information presented in this cross reference

The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
Please note that this cross reference is based on TOSHIBA's estimate of compatibility with other manufacturers' products, based on other manufacturers' published data, at the time the data was collected.
TOSHIBA is not responsible for any incorrect or incomplete information. Information is subject to change at any time without notice.

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재고 확인 및 구매

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

Types of Optical Semiconductors
Light-Emitting Principal of LEDs
The wavelength range of LEDs
What Is a Photocoupler?
Why Are Photocouplers Necessary?
Types of Photocouplers
Types of Photocouplers (Packages)
Types of Photocouplers (Internal Structure)
Safety Standards of Photocouplers
Characteristics of Photocouplers (Current Transfer Ratio: CTR)
Principal Characteristics of Photocouplers (Trigger LED Current)
Aging Variation Data of Photocouplers
How to Use a Photocoupler “Input Current”
How to Use a Photocoupler “Output Current”
How to Use a Photocoupler “Output-Side Resistor”
How to Use a Photocoupler Check

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