HCPL-5400#300

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Optoisolators are devices used in electric circuits to protect them from dangerous high voltage spikes. The HCPL-5400#300 is a logic output optoisolator capable of operating at an isolation voltage of 6kV RMS. It is used to provide a reliable and fast optical connection between a low-level digital control circuit and a higher voltage control circuit. This section will discuss the application fields and underlying working principle of the HCPL-5400#300.

Application Field

The HCPL-5400#300 is a 3-channel optoisolator with phototransistor output. Its most common application field is providing an optically-isolated 3-stage AC/DC control. Its 3 individual channels can drive up to 200mA of load current and, thanks to its hermetic construction, can operate in an extremely wide temperature range of -40°C to 105°C. Besides AC/DC control, the HCPL-5400#300 can also be used in motor-driver circuits and automotive control applications.

By virtue of its high common mode transient immunity (CMR) and high dV/dt capability, the HCPL-5400#300 is also often used in applications involving long cable connections and long signal lines to ensure signal integrity over a large distance. In addition, its low input current feature makes it a preferred choice for applications that require a power supply of only a few milliwatts, such as telecom isolator solutions.

Working Principle

The HCPL-5400#300 utilizes a dual input structure to achieve a high isolation voltage and fast response time. The two inputs in the device are the LED side and the phototransistor side. These two inputs form an optocoupler to provide a three-port connection: the low current side, the logic side, and the high voltage side.

At the LED side, a differential input signal is made by two light emitting diodes (LEDs) connected in series and fed by a current source. These two LEDs together emit light and the light intensity is modulated as the input signal changes. This modulated light is then detected by the inverse-parallel connection of two phototransistors, at the phototransistor side. The phototransistors detect the modulated light and output a high impedance voltage signal, thus providing a controlled electrical connection between the two sides.

The phototransistors in the HCPL-5400#300 are optically coupled to the LEDs in a closed loop configuration. This closed loop combined with the differential input arrangement ensures fast response time and high slew rate. Furthermore, the use of a metal can package allows the device to achieve high common mode noise rejection.

Conclusion

The HCPL-5400#300 is a logic output optoisolator perfect for a wide array of applications such as AC/DC control, motor control, and telecom isolators. It is fast and offers high isolation voltage and high common mode noise rejection. Its closed loop configuration and differential input arrangement ensure both fast response time and reliable functioning.

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