VOL628A Isolators

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Optoisolators offer an effective way of providing electrical insulation between two circuits by using light to bridge the gap between them. The VOL628A optoisolator is a transistor, photovoltaic output type of optoisolator, developed by Vishay Intertechnology. It provides reliable galvanic insulation between a low-voltage and a high-voltage circuit.

The VOL628A optoisolator consists of a miniature GaAlAs infrared LED and a MOS phototransistor. The LED is pre-biased and the detector is MOS−enhanced with superior linearity, making it well suited for ultra-low power switched photocoupler applications. The device can be used in ITSM circuits, switchmode power supplies, motor control, and interfacing between circuits of different potentials.

Working Principle

The VOL628A optoisolator works on the principle of photocoupling. The LED in the optoisolator emits an infrared light beam when current flows through it. The phototransistor then detects the light beam and causes the current to flow through it, providing an electrical output. The key advantage of optoisolators is that there is no physical or electrical connection between the two circuits. This ensures that any voltage fluctuations do not travel from one circuit to the other, increasing the safety and reliability of the system.

The VOL628A device has fast rise and fall times, low capacitance, and low off-state current. It also has an optimized optical system with enhanced linearity and a wide acceptance angle, making it ideal for interfacing different types of electrical systems.

Application Field

The VOL628A optoisolator is ideal for applications where electrical isolation is required between low-voltage and high-voltage circuits. It is also used in systems that require fast response, such as motor control, computer interface, signal regeneration, and any other instances where quick on/off action is needed. The VOL628A device can also be used in isolated AC/DC power supplies, relay drivers, medical instruments, and consumer appliances.

The VOL628A optoisolator is a reliable and cost-effective solution for applications where electrical isolation is required. It is easy to install and maintain, and provides a safe and reliable path for signal transmission between two different circuits. It is ideal for applications that require fast response, low off-state current, and low capacitance.

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