L79L05ACD

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The L79L05ACD is perhaps the most widely used linear voltage regulator. It is a three-terminal, low drop-out voltage regulator with a maximum voltage drop of 0.4 V. It is widely used to regulate the voltage of various electronic devices such as LED drivers, mobile phones, digital cameras, and so on. This article will discuss the application fields and working principle of L79L05ACD.

Application fields

The L79L05ACD is a low drop-out linear voltage regulator. Its outputs can range from 1.2 V to 15 V with a maximum input voltage of 25 V and a maximum output voltage of 18 V. This makes it an ideal choice for a wide variety of applications requiring a regulated output voltage with minimal power dissipation. These applications include:

• Consumer electronics
• Household appliances
• LED drivers
• Mobile phones
• Digital cameras

It is also useful for applications that require a precise voltage source for calibration or testing. The low drop-out voltage of the L79L05ACD makes it well suited for battery-powered applications, where energy efficiency is paramount.

Working principle

The L79L05ACD operates by controlling its output voltage with a transistor in series with the input voltage. The transistor is driven by an adjustable reference voltage on its gate. The reference voltage is adjustable with an external potentiometer, or by connecting a voltage divider with two external resistors. The reference voltage determines the output voltage, and will hold steady even if the input voltage varies up or down. If the load current increases, therefore increasing the voltage drop across the series transistor, the output voltage will remain the same, as long as the maximum output current of 1.5 A is not exceeded.

The L79L05ACD includes several features to protect it from overvoltage, overcurrent, and over temperature conditions. An on-board Zener diode clamps the output voltage at 17 V, protecting the IC from input voltage transients. An on-board current limiting circuit will shut down the output if the current reaches 1.5 A. An over-temperature protection circuit also has the same effect if the temperature of the IC exceeds +150°C.

Conclusion

The L79L05ACD is a three-terminal, low drop-out voltage regulator with a maximum voltage drop of 0.4 V. Its wide input and output voltage ranges make it ideal for a variety of different applications, such as consumer electronics, household appliances, LED drivers, mobile phones, and digital cameras. Its low drop-out voltage and various protection features make it well suited for battery-powered applications, where energy efficiency is of paramount importance. The output voltage of the L79L05ACD is adjustable with an external potentiometer or voltage divider, allowing for precise voltage sources to be used for calibration or testing.

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