HCPL-7720-520

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Optoisolators - Logic Output

HCPL-7720-520 is a general purpose optoisolator which can be used for a variety of applications. This optoisolator is known for its reliability, durability and small size. The HCPL-7720-520 consists of a convenient 14-pin dip package and can be mounted directly on a PC board. It has a maximum isolation voltage of 5,000V peak, making it suitable for use in high voltage and/or sensitive electronic circuits which require insulation.

Application Fields

The HCPL-7720-520 is ideal for use in applications where isolation and/or high voltage protection is required. Examples of these applications include interfacing with industrial automation systems, monitoring 5V TTL logic levels, monitoring 3-phase AC power signals, controlling motor drive circuits, and protecting delicate circuits from induced surges and transients. The HCPL-7720-520 can also be used to provide input and output isolation for systems operating in hazardous or hostile environments.

Working Principle

The HCPL-7720-520 optoisolator works on the principle of an input LED and an output phototransistor pair. The LED is powered by the input signal, which causes it to generate light proportional to the input signal, which is then detected by the output phototransistor. The photons from the LED are absorbed by the phototransistor’s base-emitter junction, causing it to conduct. The output of the phototransistor is then sent to the output circuit.

The HCPL-7720-520 is designed for use with TTL logic levels, meaning it can detect voltages between 0 and 5 volts. It has a turn-on voltage of 2 - 4V and a turn-off voltage of 0 - 0.5V. The hysteresis of the HCPL-7720-520 optoisolator (the difference between the turn-on and turn-off voltage of the device) is 0.5V which prevents it from oscillating due to small fluctuations in input voltage.

The HCPL-7720-520 optoisolator has a wide bandwidth and can detect frequencies up to 1 MHz, making it suitable for high speed applications such as motor control. The device is also capable of driving loads up to 1.5A, allowing it to be used for controlling large loads as well as providing isolation.

Conclusion

The HCPL-7720-520 is a versatile optoisolator which can be used for a variety of applications which require isolation or high voltage protection. It is suitable for use with TTL logic levels, has a wide bandwidth, and can drive loads up to 1.5A. The HCPL-7720-520 is known for its reliability, durability and small size, and is easily mounted onto a PC board.

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