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Application Field and Working Principle of UA78L08ACDG4

The UA78L08ACDG4 is a 8-Terminal Positive Linear Voltage Regulator. This voltage regulator is generally used in low voltage circuits and its applications include providing regulated voltage for powering other circuits, such as in battery supplies, local on-board regulators, or other applications where a regulated supply is needed.

Important Features

• Input Voltage Range: 7V − 18V
• Output Voltage Range: 5V ±1%
• Output Current: 100 mA
• Low Dropout Voltage
• Safe Operating Area Protection Circuitry
• Thermal Shutdown Protection Circuitry

Working Principle of UA78L08ACDG4

The UA78L08ACDG4 is built around an internally compensated voltage reference and an error amplifier. It contains four transistors; one voltage reference, one error amplifier and two pass transistors. The integrated circuit is attached with a heat sink.

The linear voltage regulator operates on the following principle. The output voltage is fed back to the input and compared to a reference nominal value, this forms a closed loop control system. The error amplifier monitors the output voltage and any discrepancies between the reference potential and the sampled output voltage is amplified. The amplified signal is then passed to a pass transistor which increases or decreases the input current through the feedback loop to maintain the output voltage.

The primary function of the linear voltage regulator is to provide a regulated voltage output regardless of how the input voltage or load changes. It is designed to withstand large load or input voltage variations and maintain the output voltage within preset limits.

Application of UA78L08ACDG4

The UA78L08ACDG4 is a low dropout, positive linear voltage regulator. The output voltage is 5V ±1%. The UA78L08ACDG4 is widely used in applications where a regulated 5V supply is needed, such as portable applications, point of sale systems, industrial systems, and automotive applications. The low dropout voltage, safe operating area protection circuitry, and thermal shutdown protection circuitry makes the UA78L08ACDG4 suitable for use in unstable or high temperature environments.

The UA78L08ACDG4 can also provide a regulated output in applications where the input voltage is higher than the required output voltage. It is particularly useful in applications where the input voltage is constantly changing, as the output voltage can be maintained irrespective of the input voltage fluctuations.

Conclusion

The UA78L08ACDG4 is a pragmatic solution for low-voltage, linear voltage regulator applications. With its low dropout voltage, safe operating area protection circuitry and thermal shutdown protection circuitry, it is suitable for use in unstable, high temperature, and low voltage environments. Its applications include powering portable systems, point of sale systems, industrial systems, and automotive applications.

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