HCPL-3700-320

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The HCPL-3700-320 is a phototransistor optoisolator used to electrically isolate two circuits from one another. This optoisolator is classified as a transistor, photovoltaic output, and can be used in applications that require a strong electrical isolation property. In this article, the application fields and the working principle of the HCPL-3700-320 will be discussed.

Application Fields

The HCPL-3700-320 is mainly used in secondary protection and signal level isolation applications.

• The most common application of the optoisolator is in secondary protection circuits. It can be used in DC-DC converters, relay, and switch drivers to protect the circuits from short circuit and overcurrent. Moreover, in AC load switching and LED drive applications, the optoisolator can provide galvanic isolation to protect the circuits from malfunctioning.
• Optoisolators can also be used in signal level isolation applications, for instance, in industrial communication systems. The optoisolator can isolate the contact closure and logic level signals between two different circuit boards. Besides, a phototransistor optoisolator is suitable for switching high speed signals such as frequency signals.

Working Principle

The HCPL-3700-320 has a phototransistor optoisolator connected to a substrate, forming an electrically insulated package. A light-emitting diode (LED) is housed in a translucent epoxy plastic inside the package. The LED can be activated when a voltage is applied between the anode and the cathode. An electrical signal is transformed into a light signal, which is then modulated to form the output signal. The light signal is detected by the phototransistor, and the transistor amplifies the signal before providing the output.

The optoisolator offers several advantages over other isolation devices, such as the capacitive and magnetic optoisolators. While capacitive and magnetic types of optoisolators are vulnerable to electrostatic discharge (ESD) and electromagnetic interference (EMI), the HCPL-3700-320 optoisolator is highly resistant to ESD and EMI. Additionally, photo-transistor optoisolators can achieve small size, low cost, and good common-mode rejection in comparison with other optoisolators.

Conclusion

In conclusion, the HCPL-3700-320 phototransistor optoisolator is suitable for secondary protection and signal level isolation applications. The optoisolator transforms an electrical signal into a light signal and modulates it to form the output signal. The optoisolator also provides excellent protection against ESD and EMI and offers smaller size and lower costs when comparing with other optoisolators.

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