VO0661T Isolators

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Optoisolators - Logic Output

Optoisolators, also known as optocouplers, are widely used in the electronics industry to provide electrical isolation between two circuits. Among them, the logic output optoisolator is one of the most common types used in various applications. This article will discuss the application field and working principle of VO0661T, a high-speed silicon-controlled optocoupler.

VO0661T Application Field

VO0661T is a kind of AC-input type optocoupler which utilizes a discrete fast response Silicon Controlled Rectifier (SCR) as the output photodiode. It is designed for applications where a transient response time is required and has a Minimum Isolation Voltage (VISO) of 6000Vrms and a Maximum Working Voltage (VWDM) of 1000VAC. Main application fields for VO0661T optoisolator include, but not limited to, PC-based systems, consumer products, industrial controllers, machinery automation, and motion control.

VO0661T Working Principle

The primary and secondary circuits are completely isolated by the optoisolator. In VO0661T, the amplifier acts as the primary circuit and the SCR acts as the secondary circuit. When an AC voltage is applied to the optoisolator, the current flow through the primary electrode is modulated by the drain current of the transistor. This modulated current will actuate the internal SCR, thus generating the electric field necessary to turn on the SCR. This will result in the generation of a signal voltage across the secondary circuit, which can be used as the output.

Conclusion

In summary, VO0661T is a kind of AC-input type optocoupler widely used in various applications. It utilizes a discrete fast response Silicon Controlled Rectifier (SCR) as the output photodiode and has a Minimum Isolation Voltage (VISO) of 6000Vrms and a Maximum Working Voltage (VWDM) of 1000VAC. Its working principle is based on modulating the current flow through the primary electrode by the drain current of the transistor, thus actuating the internal SCR and generating the electric field necessary to turn on the SCR.

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