680581-3

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680581-3, commonly referred to as a three-terminal in-line series pass device, is a linear regulator integrated circuit for maintaining constant output current in a varying load. It is widely used in both the residential and commercial sectors for powering medium to high power electronic devices.

The 680581-3 consists of an adjustable voltage regulator, an input regulator, and a current and voltage reference. The adjustable voltage regulator and input regulator control the output voltage and current by either increasing or decreasing the voltage or current depending on the input voltage. The current and voltage reference are used to adjust the output voltage and current while the load changes.

The 680581-3 is set up as a voltage regulator by clogging together two resistors in a series. The value of the resistors is selected depending on the desired output voltage. The two resistors form a voltage divider and these outputs from the voltage divider can be used as the control input for the 680581-3. The 680581-3 operates as a current source, with output voltage regulated when there is a change in load. This is achieved by controlling the voltage at the third terminal of the 680581-3. This third terminal is commonly referred to as the sense voltage or sense terminal.

When the output current reaches the desired level, the voltage reference begins to rise and the voltage at the sense terminal also increases. This causes the 680581-3 to decrease the output current and increase the output voltage as the current decreases. This ensures that the output current is maintained at the desired level.

The 680581-3 has a wide range of applications, from consumer electronics, electrical appliance, and automotive solar panel systems, to industrial and medical applications. It can be used in systems with a relatively high input voltage, such as those used for electric vehicle (EV) charging stations. Its high efficiency also makes it suitable for use in optical networking systems.

In conclusion, the 680581-3 is a highly versatile three-terminal in-line series pass device used for maintaining constant output current in a varying load. It can be employed in a variety of applications which require a low noise and high efficiency linear regulator. Its relatively high input voltage tolerance and its ability to handle load transients also make it a widely used component in the consumer and industrial markets.

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