HCPL-7720#300

Optoisolators provide a high level of electrical isolation between input and output by utilizing an optical signal path. HCPL-7720#300 is a logic output optoisolator developed by Broadcom and is suitable for applications with medium noise immunity and 4mA output current capability. This article will introduce the application field and working principle of HCPL-7720#300.

Application Field of HCPL-7720#300

The HCPL-7720#300 is a 4mA logic output optoisolator with a wide variety of applications. It can be used in digital circuits for isolating logic signals, such as system logic output, UARTs, and SPI/I2C interface signals. Additionally, it is effective in providing noise immunity from system ports in interfaces and computer peripherals. It can also be used in protection circuits for motor control, automation and rapid control prototyping systems.

Working Principle of HCPL-7720#300

The HCPL-7720#300 optoisolator works on the principle of transferring electrical signals using an infrared LED and a phototransistor. The input signal is converted to an optical signal by the LED, which is then transmitted across the isolated space. After being received by the phototransistor, the optical signal is converted back to an electrical signal, which is then output as the logic signal. The LED and phototransistor are connected in series, with the LED connected to an input voltage source that is usually 5.0V. When the input voltage is low (0V), the LED will not emits light, resulting in the phototransistor being off; when the input voltage is high (5V), the LED is on and emits light, which is received by the phototransistor, causing it to turn on. Therefore, the output voltage that is produced is directly proportional to the input voltage

Conclusion

HCPL-7720#300 is a high-performance logic output optoisolator that provides electrical isolation between input and output signals. It has a wide range of applications and is suitable for digital interface signal isolation, protecting circuits from noisy environments, and providing noise immunity in system interfaces and computer peripherals. Its working principle involves transferring electrical signals through a LED and phototransistor which results in an output voltage that is proportional to the input voltage.