ILQ621GB-X017T

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Optoisolators are commonly used in circuits as a way of electrically isolating things from each other. One particular type of optoisolator, the ILQ621GB-X017T, is engineered for applications where a high common mode transient immunity is needed, providing the ability to accurately sense circuit events. This article will explore its application field and specific working principle.

Application Field

The ILQ621GB-X017T is designed to be used in low voltage systems with an operating voltage of 5V. It has a compact design making it an ideal choice for applications where space is at a premium. It is also well-suited for many automotive applications, such as automotive body control systems, automotive interior lighting, and headlights. Additionally, this optoisolator is approved by many major standards and certification agencies, such as UL746C, UL1977, VDE, and CSA, to name a few.

The ILQ621GB-X017T has a wide range of applications due to its many features. It has an LED indicator, allowing the user to visually monitor the output state. It has logic outputs on both output pins, meaning that it can be used to flip either one output or both at the same time. It also has a wide temperature range, allowing it to be used in high temperature environments. Finally, it has a high common-mode transient immunity (CMTI) of over 50kV/µs, making it ideal for sensing circuit events.

Working Principle

The ILQ621GB-X017T is a transistor-photovoltaic output optoisolator, meaning that it uses a combination of a transistor and photovoltaic cell to isolate two circuits. The primary circuit consists of an LED which emits light when triggered. The secondary circuit contains a photovoltaic cell which emits an electric charge in response to the light emitted by the LED. This electric charge is then amplified by a transistor, and the resulting voltage is applied to the input of a logic circuit.

The logic circuit contains two output transistors, one for each of the output pins. The voltage of the input is compared to a reference voltage. If the voltage is higher than the reference voltage, the first output transistor is activated, resulting in a logic high at the output. Similarly, if the voltage is lower than the reference voltage, the second output transistor is activated, resulting in a logic low at the output. In this way, the ILQ621GB-X017T can accurately sense circuit events and respond accordingly.

Conclusion

The ILQ621GB-X017T is an ideal option when looking for a transistor-photovoltaic output optoisolator. Thanks to its wide temperature range, LED indicator, and high common-mode transient immunity, it is well-suited for use in a variety of applications. Additionally, by understanding its working principle, users can leverage its many features to accurately sense circuit events and control outputs.

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