TLP191B(TPR,U,C,F)

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An optoisolator is a device which uses a light-emitting component and a light-sensing component to electrically isolate two paths while allowing a signal to pass between them. The TLP191B optoisolator is an example of a transistor-photovoltaic (TPR) output optoisolator which uses a light-emitting diode as the light-emitting component and a phototransistor as the light-sensing component. It has a closed-collector output and a current transfer ratio (CTR) of up to 250 % and is designed for switching operations.The TLP191B optoisolator contains a light-emitting diode which is driven by an input voltage, for example 5 V. When the input voltage reaches the forward voltage of the LED, typically 1.2 V in this case, the LED emits light. This light is detected by a phototransistor which is also driven by a voltage, for example 12 V. When the phototransistor detects the light from the LED, it turns on and allows current to flow through the collector-emitter path of the phototransistor. As this current flows, it creates a voltage drop across the collector-emitter path of the phototransistor, which acts as an output voltage.The TLP191B optoisolator also has a current transfer ratio (CTR) of up to 250 % which is defined as the ratio of the input current to the output current. This is determined by the gain of the phototransistor, i.e. the ratio of the collector current over the emitter current. When the phototransistor is saturated (fully conducting), the CTR is typically in the range of 30 to 50 %. The higher the CTR, the more current can be transferred with the same amount of power.The TLP191B optoisolator is designed for switching operations due to its fast response time and low power consumption. It is typically used in applications such as relay and contactor control, motor control, motor speed control, computer interfaces, data transmission systems, telephone systems, and industrial automation.In summary, the TLP191B optoisolator is a transistor-photovoltaic (TPR) output optoisolator which is designed to electrically isolate two paths while allowing a signal to pass between them. It contains a light-emitting diode and a phototransistor, and has a closed-collector output with a maximum current transfer ratio (CTR) of up to 250 %. It is optimized for switching operations and is commonly used in various industrial and data communication applications.

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