L78L09ABZ

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Linear regulators are electronic components used to convert a higher voltage into a lower one. Often the input voltage is much higher than the required output. A linear regulator will convert a higher voltage to a lower one while providing clean, regulated power. The L78L09ABZ is a linear voltage regulator which provides a constant output voltage of 9V and up to 100mA of load current in reduced voltage applications.

Features and Benefits of the L78L09ABZ

• High accuracy over line and load for predictable performance: The device features a high accuracy of ±1% over a wide input range, allowing a predictable output voltage over line and load.
• Wide input voltage range: The L78L09ABZ has a wide input voltage range of 8V-18V, allowing the device to easily accommodate both low-voltage and high-voltage applications.
• High accuracy over temperature: The device is designed to provide a very stable output voltage even over a wide temperature range, guaranteeing long-term performance.
• Quiescent current: The device operates with a low quiescent current, helping to reduce power consumption and extend battery life in portable applications.
• Numerous safety features: The device includes numerous protection features that ensure safe operation in all conditions. These include over-voltage and over-temperature protection, and reverse-polarity protection.

L78L09ABZ Application Field and Working Principle

The L78L09ABZ is a linear voltage regulator commonly used in a variety of applications. It is particularly suitable for use in applications that require a constant output voltage, such as personal computers, industrial control systems and test and measurement systems.

The device works by comparison – the error amplifier compares the voltage present at the output pin to a reference voltage, and makes adjustments to the pass voltage accordingly. A power transistor is used to regulate the final output voltage.

The regulator works by first controlling the input voltage. The input control circuit operates by monitoring the input voltage and reducing it, if necessary. This prevents excessive voltages from entering the internal circuits, thereby protecting them from damage.

The output voltage of the device is then regulated by the error amplifier. The error amplifier compares the voltage present at the output pin with a reference voltage, and makes adjustments to the pass voltage accordingly. If the output voltage is too low, the error amplifier increases the pass voltage and vice versa. This enables the device to provide a constant and accurately regulated output voltage.

The device also includes a power transistor which acts as a switch to control the output voltage. The power transistor is activated by the error amplifier and is used to regulate the final output voltage.

Finally, the device includes a number of protection features that ensure safe operation in all conditions. These include over-voltage, over-temperature, reverse-polarity and short-circuit protection. These protection features enable reliable and robust operation, ensuring a long service life.

Conclusion

The L78L09ABZ is a linear voltage regulator which provides a constant output voltage of 9V and up to 100mA of load current in reduced voltage applications. It is suitable for use in a variety of applications, such as personal computers, industrial control systems and test and measurement systems. The device is designed to provide a very stable output voltage even over a wide temperature range, and includes numerous protection features that ensure safe operation.

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