HCPL-7721-560E

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Optoisolators are an important component in the modern electrical and electronic system. The function of optoisolators is to electrically isolate a sensing input circuit from the output controlling circuit. In logic output optoisolators, the input voltage is electro-optically converted into an optical signal, after appropriate amplification, is used to drive a logic output device.

One such logic output optoisolator is the HCPL-7721-560E. This optoisolator is specially designed for driving high voltage logic input systems such as relays, opto-mechanical outputs, thyristors, TRIACs, etc. This anti-parallel optoisolator has a separate open collector output stage for each of the two channels. The two channels can be enabled independently with a control voltage on the control terminals.

HCPL-7721-560E has many features which make it suitable for many applications. It has features like low power dissipation, fast switching speed, and an ability to withstand high transient current spikes. The optoisolator is also designed both functionally and mechanically for reliable operation. It can operate in a wide range of temperatures which makes it suitable for a variety of applications.

The application field of HCPL-7721-560E is primarily for isolating the two sides of the system. This optoisolator can be used for driving logic inputs for controlling thyristors, TRIACs, etc. It can also be used for driving relays or for providing isolated protection to the logic input systems from high transient currents.

The working principle of HCPL-7721-560E is based on standard optoisolator design. An LED is used to convert electrical signal into optical signal, then is amplified and finally used to turn on the internal transistor which is also connected to the output pins. When the input voltage to the control terminal is increased, the LED will be illuminated, and the transistor connected to the output pin will be turned on, allowing current to pass through the output pin. The current flow is limited by an internal resistor which prevents the overload of the system. The separate open collector output stage for each channel allows the user to select the desired channel for the desired application.

In conclusion, HCPL-7721-560E is an efficient and reliable optoisolator with logic output. It can be extensively used for isolating the two sides of the system and driving logic inputs for controlling thyristors, TRIACs, etc. This optoisolator is suitable for a variety of applications due to its high performance features and wide operating temperature range.

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