VO4154H

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Optoisolators isolate input and output signals, and the Triac, SCR Output VO4154H is an integrated optocoupler that can be used for various power applications. It boasts a combination of fast acquisition time, high differential voltages, and low thermal shutdown temperature to ensure a reliable, low cost and easy-to-use solution. The VO4154H device includes an optically-coupled thyristor module and a 6-pin leadless package with a standard dual-in-line package.

Applications of VO4154H

The VO4154H can be used in a variety of applications, such as gate-driving control of a thyristor in motor drives, inverters, and other variable speed drives. It can also be used for phase switching for electronic lighting control, continuous load current control, and on-off control of circuit breakers. Specifically, it enables the on-off control of a thyristor load within a defined range of time counts for higher efficiency and safety. This type of triac optocoupler also finds use in thyristor dimmed lighting systems, as well as in AC current monitoring applications.

Working Principle of VO4154H

The VO4154H Triac optocoupler is based on the concept of electrically isolating an input from an output, thus providing protection against potentially harmful voltages. This is achieved using an Gallium Arsenide Light Emitting Diode (LED) that is optically coupled to a power Triac output. The control signal is applied to the LED and is modulated by an AC voltage applied between the LED and the main current terminal of the output thyristor. This is done to ensure a sufficient synchronizing voltage to the Triac.

The VO4154H Triac optocoupler typically utilises a high voltage, such as 120VAC. The LED and the output thyristor are separated electrically with an insulating layer in between. The insulation layer prevents uncontrolled current flow between the two sides and provides a reliable electrical signal transfer.

When a control signal is applied to the LED, the LED will illuminate. This generates an electric field which is modulated by the AC voltage, and it is the electric field that activates the thyristor, allowing the power signals to pass through the device. The thyristor is configured to switch off when the control signal to the LED ceases. This makes the VO4154H Triac optocoupler suitable for use in applications where high voltage AC power needs to be controlled.

Conclusion

The VO4154H Triac optocoupler is an integrated optocoupler that allows the on-off control of a thyristor load within a defined range of time counts for improved efficiency and safety. It offers fast acquisition time, high differential voltage, and low thermal shutdown temperature, making it a suitable choice for a wide range of power applications. From device safe thyristors to lighting control, the VO4154H Triac optocoupler helps to realise a reliable, low cost, and easy-to-use solution.

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