VO617A-1

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Optoisolators - Transistor, Photovoltaic Output

The VO617A-1 optoisolator is a family of 4-pin optocouplers, which consist of a gallium arsenide infrared emitting diode driven by a high performance current mirror, optically coupled to a highly reliable silicon photovoltaic diode detector with an open collector driving transistor output. The output appears when the light emitted by the LED is detected by the photodiode. This optoisolator provides a wide array of features and applications.

Application Fields

The VO617A-1 can be used in multiple application fields. It is suitable for use in non-latching circuits such as data paths, power supply voltage monitors, pulse generation, and power MOSFET gate drives. It is also useful in noise suppression mechanisms, for industrial motor control, inverter drive control, as general purpose isolators in switching power supplies, and for lighting control.

The VO617A-1 is ideal for use in safety circuits for protecting against electric shock, locked rotor detection, and motor control, as well as for applications in sensing fields such as current and positional sensors and speeded semiconductor production.

Working Principle

The optoisolator works by relying on the principles of optics and electromagnetism. An LED is connected to a current mirror circuit and it emits visible light which is then received by a photodiode. When the photodiode receives the light, an electric current is generated inside it, which stimulates an open collector output driving transistor. As the transistor is open-collector, it is forward biased and contacts the output terminal, forming an electronic switch, thus transferring a signal from one controller to another.

The current mirror circuit creates a very constant current between the emitter and collector of the LED, allowing for the light generated by the LED to be constant and thus providing a precise signaling system. This current mirror is necessary in order to maintain the normal operation of the optoisolator as it prevents excessive current from melting the LED\'s junction when it suddenly turns on.

The photodiode also has its own circuitry as it has to be capable of detecting the light from the LED and convert it into electrical energy. The electric current generated by the photodiode is then connected to a metal-oxide-semiconductor (MOS) field-effect transistor (FET) switch, which is, in turn, connected to the output terminal. When the photodiode detects the light from the LED, it initiates the FET switch, which opens and allows the signal to be transferred from the input to the output.

The optoisolator has an excellent signal to noise ratio and is capable of isolating a signal from noise up to 10kHz. This optoisolator family also provides a fast turn-on time of 3us, and a wide operating voltage range from 8V to 25V. The VO617A-1 is able to handle a high temperature range from -40°C to 105°C and it has a low static current consumption of around 0.1mA.

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