MOC3052TVM_F132

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The MOC3052TVM-F132 is a 6-pin zero-cross optoisolator device designed for use in various AC load control applications. It contains two GaAs infrared emitting LED’s and a zero-cross detector with an FET output. The zero-cross detector provides a Schmitt trigger output with a single pulse for each half AC cycle, suitable for triggering TRIAC. The optoisolator is designed to minimize hazards associated with hazardous levels of high voltage AC or DC which may not be fully isolated from the line.

Application Field of MOC3052TVM_F132

The MOC3052TVM-F132 optoisolator is typically used in AC line powered appliances like lighting controllers, motor controllers, AC valve driver, electric dimmers, temperature controllers, long distance communication and safety interlocks. Due to high noise environment and the high common-mode transient immunity, the MOC3052TVM-F132 can be also used in applications like medical equipment, domestic automation, etc.

Working Principle of MOC3052TVM_F132

The MOC3052TVM-F132 consists of two GaAs infrared emitting diode (IRED) chips, which are also known as input diode, and a zero-cross detector with an FET output. The input diode, when supplied with a continuous operating current, produces the modulated light pulses. The zero-cross detector senses the zero-crossing of the input waveform, and then generates a single pulse for each half AC cycle, transforming the AC line power into a DC pulse. This DC pulse is then applied to the output FET, causing it to switch on, thus triggering the TRIAC.

In the MOC3052TVM-F132, the input circuit contains two IRED’s, which form the modulated light source. This modulated light source produces a light pulse of several milliseconds, every half mains cycle. As this pulse is produced, the zero-cross detector senses the zero-crossing of the input waveform, generating a single pulse for each half AC cycle. The output section consists of a FET, which switches on every half AC cycle, thus generating the desired output voltage.

In summary, the working principle of MOC3052TVM-F132 is a zero-cross detection circuit, which produces a single digital pulse for each half AC cycle, to trigger the FET in the output section, which in turn triggers the TRIAC.

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