4N28SR2M

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Optoisolators are commonly used to provide electrical isolation between two pieces of equipment, allowing them to interact with each other without dangerous voltage or current spikes passing between them. One of the most commonly used types of opto-isolators is the transistor-photovoltaic output, such as the 4N28SR2M. This type of opto-isolator makes use of a light-sensitive element, typically a light-emitting diode (LED) that emits light when energized, and a photosensitive device, such as a transistor, whose output is affected by the light from the LED. This article will discuss the application field of the 4N28SR2M, as well as its working principle.

Optoisolators are used in many different applications, from controlling the power output of medical equipment to providing an insulating layer between power and control signals in industrial control systems. 4N28SR2M is commonly used to create electrical isolation between signals, such as signals from a alternating current (AC) motor, and logic control signals from a controller. By providing a light-based electrical insulation layer, this type of opto-isolator allows AC motors to be controlled using logic control signals without the danger of electrical current spikes, or ‘back-emf’, from the motor damaging the controller or other components.

In the 4N28SR2M, the light emitted from the LED is detected by the photo transistor, which allows the device to serve as a two-way communication route between two pieces of equipment. When a control signal is applied to the LED, a voltage is induced in the base of the photo transistor. If the control signal is greater than the breakdown level of the photo transistor, the transistor will turn on, and a controlled current will pass through both the collector and emitter of the transistor. This current can then be used to supply power to an external load, such as an AC motor, or to control its operation, such as speed or direction.

In addition to providing signal isolation, the 4N28SR2M can also be used for driving electrical signals. In this application, the LED is provided with a control signal that is above the breakdown level of the photo transistor. This causes the photo transistor to turn on, allowing for a greater amount of current to flow between the collector and emitter of the transistor. By varying the voltage of the control signal, the current passing between the collector and emitter can be effectively controlled.

The 4N28SR2M can also be used for level-shifting or pulse-width modulation (PWM). In level-shifting, the LED is provided with a voltage that is above the breakdown voltage of the photo transistor so that a greater current will pass between the collector and emitter of the transistor. The output of the device is then either a digital or an analog signal, depending on the type of drive used for the LED. For PWM, the LED is driven with a pulse-width modulation signal, allowing for a variable amount of current as the control voltage changes.

The 4N28SR2M is a reliable and cost-effective opto-isolator that is well-suited for a variety of applications. Its ability to provide electrical isolation and to serve as a signal and power interface make it ideal for a variety of industrial and medical applications. With its compact size and wide range of operating parameters, the 4N28SR2M is a reliable and flexible opto-isolator.

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