MOC3011SVM

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Optoisolators – Triac, SCR Outputs are widely used across many industries such as automotive, HVAC, home security systems, industrial automation, medical instrumentation, etc. The MOC3011SVM is a triac-output, optically-isolated switch module that is suitable for the control of silicon controlled rectifiers (SCRs) and triacs up to 600V both AC and DC. Optically isolated if the input is connected to ground.

The diagram to the right can be used as a reference for its working principle. The MOC3011SVM contains an infrared emitting diode (IRED) which optically isolated an optically coupled silicon bilateral switch, and output, in this case, a TRIAC. The TRIAC can be used to switch AC or DC at its peak blocking and off-state voltage ratings (up to 600V). The insulated TRIAC gate voltage generated is typically 5.5V (nominal) at an IF of 20mA.

The MOC3011SVM is highly versatile as it can be operated in two modes. The first and most commonly used is Zero Voltage Triggering (ZVT). In this mode, the power source must be applied in-phase with the gate voltage input signal. The second is Active State Mode which uses a DC and has the power source out-of-phase with the gate voltage input signal. This mode is most useful for reducing the surrounding power dissipation of gate circuits. Both modes require no external components other than an isolation barrier.

When it comes to application fields, the MOC3011SVM is generally put to use in HVAC, home security systems, and industrial automation. It is especially useful for applications such as direct drive PFC (Power Factor Correction) supplies, motor control of three-phase AC loads, as well as harsh environment applications such as pumps, HVAC, home appliances, etcetera.

There are also several other applications as per the manufacturer’s recommendation such as EMS (Energy Management System), gas control devices, industrial heat control and regulation systems, and CNC (computer numerical control) machines. As one can imagine, with AC and DC control, the MOC3011SVM can be applied in a wide range of industries and applications from automotive to medical instrumentation.

The MOC3011SVM can also be used with an AC Low Voltage Motor Control (LVM) circuit. Such a circuit typically consists of a DC bus voltage, a three-phase bridge, an opto-isolated TRIAC switch, and a protection element such as a fuse/circuit breaker. The opto-isolation TRIAC switch can be connected to the three-phase bridge using the MOC3011SVM. This ensures that the power source is not subject to ground anomalies and ground leakage currents.

The MOC3011SVM provides both an economical and reliable opto-isolation interface between the power source and the load. Its current regulated output, high-power dissipation, low off-state power dissipation, along with its flexible design makes it one of the most popular opto-isolated TRIAC switches in the market. Its capability to work in both Zero Voltage Triggering (ZVT) and Active State Polarity (ASP) modes with AC or DC applications make it suitable for various applications and industries.

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