PS2761B-1-A

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Optoisolators - Transistor, Photovoltaic Output, like the PS2761B-1-A, are widely used in a variety of applications. This article will discuss the application field and working principle of the PS2761B-1-A.

The PS2761B-1-A is a 4-pin optoisolator with a transistor output that provides electrical isolation between a control circuit and a load.It is designed for direct replacement of mechanical relays in automotive electronics. It has low current consumption, incorporates a photovoltaic input, and is available in a SOP package. It also features an input voltage range of 4.5-16V and supports an operating temperature range of -40℃ to 85℃.

The optoisolator’s primary application fields include Automotive communications systems, Factory automation systems, Industrial motor controllers, Office automation systems, and Home appliances. In these application fields, the optoisolator creates galvanic isolation between two circuits, which prevents the uncontrolled transfer of disturbance signals and reduces system malfunctioning.

The working principle of the PS2761B-1-A is based on the photo-current transfer. The isolated input into the optoisolator consists of an input pin, a dielectric layer, and an infrared LED. The input pin is connected to one terminal of the input voltage while the infrared LED is connected to the second terminal. When triggered, the infrared LED produces light with a wave length of 880nm. This light passes through the dielectric layer and is absorbed by a photodiode. The photodiode converts the absorbed light into a current that passes through a photoresistor, producing an input signal.

The output signal is generated by the emitter and collector terminals. When the input pin is triggered, a photo-current is generated which causes a voltage drop across the photoresistor and the output pnp transistor to be turned on. This in turn, produces an output current, which is applied to the load.

In summary, the PS2761B-1-A optoisolator is a 4-pin device with a transistor output that provides electrical isolation between two circuits. Its primary application fields include Automotive communications systems, Factory automation systems, Industrial motor controllers, Office automation systems, and Home appliances. Its working principle is based on photo-current transfer which produces an output current applied to the load from the input pin when it is triggered.

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