Design Guidelines for Transistor Output Optocouplers

摘要

A standard optocoupler provides complete electrical isolation of electronic circuits from input to output while transmitting information across that electrical isolation barrier using infrared light from the phototransistor contained inside the optocoupler. There are two primary operating modes for transistor output optocouplers: Linear mode and digital logic mode. Optocouplers can provide isolation benefits for many possible circuits, but for this article we will assume a simple common collector configuration for the phototransistor output.