EL357ND(TA)-VG

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Optoisolators, also referred to as opto-couplers, serve as an excellent mechanism for keeping signals separated and reducing the interference that is caused when two very different systems work together. The EL357ND(TA)-VG is a single channel output optocoupler using a photovoltaic (PV) output transistor. It is designed to provide isolation while maintaining high speed switching between two connected electronic systems.

The primary benefits of the EL357ND(TA)-VG optocoupler is its ability to provide exceptionally reliable isolation between two systems with minimal attenuation of signals traveling across. Maximum transferable power is given as 1 Watt while the turn-on and turn-off delay times are 4.5 µs and 11.5 µs respectively at an ambient temperature of 25°C. To further increase the efficiency and isolation of the device, maximum collector-emitter voltage (VCE) for the connected transistor should be limited to 60 volts and the collector-emitter saturation voltage to 1.0 volts.

The EL357ND(TA)-VG has a wide application field that includes its use in communication systems, programmable logic controllers, AC adapters, and other electrical circuits. One notable example of its application is when used with pulse-width modulation (PWM) controllers. In these applications, optocouplers are typically used to connect PWM outputs to circuit nodes, allowing for easy operations and enhanced reliability. This is due to the photovoltaic output of the EL357ND(TA)-VG, allowing for linear current transfer across the connection while isolating any noise signals that may be present.

The working principle of the device can be explained as the light generated by the LED, and emitted through its window, will continuously encounter the PV layer, composed of four equal diodes connected in a series, within the phototransistor. By applying a forward bias voltage to the light-emitting diode (LED), the current flowing through it will be converted into photons which are then impinged onto the PV layer, creating a potential difference across the collector-emitter region within the phototransistor. This electric current is then utilized as an output from the phototransistor. With such a circuit, signals can be isolated from one another, allowing for more reliable operation.

In conclusion, the EL357ND(TA)-VG is a single channel output optocoupler featuring a photovoltaic (PV) output transistor, designed to provide reliable isolation between two disparate systems with minimal attenuation of signals. Its wide application field includes communication systems, programmable logic controllers, AC adapters, and other electrical circuits. Using the photovoltaic output, linear current transfer is possible across the connection, while reliably isolating any noise signals that may be present. With such an optocoupler, operation becomes significantly more stable and reliable.

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