H11C4

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Optoisolators are electronic components that allow an optocoupler to serve as a signal/data isolator. The digital input pulses from a processor or microcontroller are converted to an optical waveform and transferred between the transmitting and receiving section. For improved signal transfer, an LED is used in the transmitting section and the signal is detected by a photodiode in the receiving section. The type of output device is usually dependent on the design of the specific optoisolator. In the case of H11C4 optoisolators, the output device is a Triac or SCR.

The H11C4 optoisolator integrated circuit, produced by Harris Semiconductor, is a 4 no-lead package and provides tight optical coupling between the coupler and its signal source. It has two different control elements for the input stage and the output stage. The input stage houses the transmitter LED, while the output stage houses the photocoupler. The output stage also contains a drive transistor that performs a drive current amplification function, as well as a SCR or Triac as the output device.

The main function of an optoisolator is to provide electrical isolation between the input and output devices, which allows two circuits to interact without introducing important noise to the system. By isolating the system in this way, it prevents the emission of extraneous electrical noise from one side to the other, leading to improved system performance. The output of the H11C4 optoisolator provides tight optical coupling in either Triac or SCR output modes.

The working of the H11C4 optoisolator can be explained in two stages: the optocoupler stage and the output stage. The LED in the optocoupler stage used to emit a light pulse proportional to the input, while the photodiode in the same stage is used to detect and convert this light into an electrical pulse. The detected electrical pulse is being used to activate the output stage, which is a Triac or SCR. In the Triac output mode, the detected electrical pulses are converted to an output voltage of 40V or less, depending on the potential difference between the anode and the gate. On the other hand, in the SCR output mode, the output voltage is variable depending on the level of current injected from the anode.

Due to its small size and fast response rate, H11C4 optoisolators are suitable for high-speed control applications where a fast switching speed is needed. One such application is in the medical industry, where they are used in monitoring and controlling medical equipment such as pulse oximeters. Other applications of H11C4 optoisolators include current sensing, brake lights switching, input isolation, and remote control for toys and appliances.

In summary, H11C4 optoisolators provide tight optical isolation between the input and output stages, allowing two circuits to interact without interfering with each other. It provides an output voltage of 40V max or variable in the SCR output mode. Furthermore, its compact size and fast response rate make it suitable for many high-speed control applications, such as in hospital equipment, current sensing, brake lights switching, and remote control for toys and appliances.

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