VO4156M-X006

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Optoisolator circuits provide an electrically safe method of isolated control for a wide variety of AC and DC loads. The use of light-emitting diode (LED) transmitters coupled with photoelectric isolators and solid-state output devices such as Triacs or SCRs permit the control of higher power loads than can normally be driven directly by microprocessors or logic circuits. The VO4156M-X006 is a popular isolated AC switch with a low profile optoisolator used to control high current AC loads up to 600 Volts.

The VO4156M-X006 utilizes a 400V AC MOSFET with a blocking voltage up to 600V and a continuous current rating of 10A. The open-collector photo-TRIAC output is suitable for switching resistive, inductive, and capacitive loads and has a surge current rating up to 20A. It also features a built-in active current balancing circuit reducing power losses by balancing the MOSFET current sourcing and sinking. An output thyristor or SCR is also available for applications with higher power AC loads. The optical isolation between the control or driving stage and the output stage provides galvanic isolation, allowing a safe switching environment for sensitive input circuit configurations.

The primary application field of the Vo4156M-X006 is in industrial process control and automation; such as temperature control, building temperature control, UV systems and processes control, AC motor control or voltage regulator. The use of an optically-isolated control makes it possible to isolate a high power load from the input signal. The optical isolation allows for safe design configurations without the fear of electrical interference from the load circuit. The VO4156M-X006 can also be used for AC dimmer and lighting controls, particularly if the extra blocking voltage and/or surge current rating are required.

The working principle behind the VO4156M-X006 is relatively simple. The optical isolator consists of an LED, capable of emitting visible light, and a phototransistor or TRIAC mounted inside the optoisolator package. The LED is connected to the input circuit by an isolation barrier, usually a voltage or current source. When the LED is activated, the light emitting from the LED is directed to the phototransistor or TRIAC, which then activates its control output. This output is then used to control the MOSFET or SCR which is then used to control the connected load.

In summary, the Vo4156M-X006 is an optically isolated AC switch which is used for controlling high power AC loads. The optically isolated control circuit makes it possible to use with sensitive input configurations. The primary application fields are in the field of industrial process control and automation. The working principle of the VO4156M-X006 utilizes an LED and phototransistor or TRIAC, where the LED emits light which is then used to activate the TRIAC control output.

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