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Renesas India - Knowledgebase

Why does the delay occur if the PS2561D elements rise in the waveform?

Latest Updated:01/01/2009


In the photocoupler PS2561D, the rise of the waveform of the output-side elements is delayed by 25 µs from the rise of the input waveform. The load resistance of the light-receiving side is 1 kΩ. The current flowing in the light-emitting side elements is 20 mA and is normal. Why does the delay occur?


As described in the characteristics of the response time vs. load resistance, the delay is assumed to occur due to a large load resistance.
If you are looking for a high-speed-response product, consider an IC output type.

Suitable Products
Diodes for Constant Voltage
Photocouplers / Optocouplers