SL5504

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Optoisolators, also known as optocoupers, are components used to electrical isolation between two parts of a circuit, usually between the input and output, using a combination of light emitting diode (LED) and a photoreceiver. The SL5504 optoisolator is a 5mm-wide compact optocoupler manufactured by Vishay Semiconductor that integrates a gallium-arsenide infrared (GaAIr) LED along with a phototransistor within one 5mm package.

Application Field

The SL5504 optoisolator can be widely found in many different types of device applications such as in variable energy control of welding machines, signal transmission, conversions, logic control, current loop interfacing, level translation, switching relays, signal conditioning, switch-mode power supplies, control circuits, industrial interfaces, servo motor control, instruments, computers, battery management systems, automotive HVAC, off-board diagnostics and PLCs.

The optocoupler is also able to function under a wide range of operating temperature, from -40℃ to 120℃, making it suitable for industrial uses that require heavy temperature conditions for example, heaters, ventilation systems, air conditioners or generators. Additionally, the SL5504 optoisolator is also designed with great noise suppression from interference of high power sources, and its high common-mode transient immunity of 5000V/µs makes it suitable for use in harsh industrial environments.

Working Principle

The SL5504 optoisolator uses a phototransistor configured as a Darlington-pair current-sense amplifier. The infrared LED is used as a light source to trigger the phototransistor on the receiver side. When the LED is activated by the input control circuit, a current will be detected by the phototransistor, inducing a voltage drop across its collector-emitter terminal rendering it in a “ON” state. This will cause the output of the optoisolator to provide an appropriate current, voltage or resistance in the output circuit.

When the LED is deactivated, the reverse process happens, where the phototransistor will be turned off and the output circuit will be deactivated accordingly. This feature gives the optoisolator the necessary isolation between high voltage levels and low voltage levels, making it suitable for use in applications that requires a high-voltage power source and a low-voltage control unit.

Furthermore, the combination of the LED and phototransistor in the optoisolator also helps to provide an isolation ratio up to 1000:1, meaning the input and output can be safely separated from each other while still having them interact with one another without causing any damage.

Conclusion

All in all, the SL5504 optoisolator is an extremely reliable optocoupler that can be found in many industrial and consumer electronics, providing isolation between the input and output circuit which allows the two components to interact without being directly connected. With its wide operating temperature range and high common-mode transient immunity, it is ideal for industrial use and is able to withstand a wide range of conditions.

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