MC79L05ACDR2

MC79L05ACDR2 application field and working principle

MC79L05ACDR2 is a three-terminal voltage regulator, and falls under the category of Power Management ICs (PMICs), more specifically under Voltage Regulators-Linear.

It is designed to output a fixed voltage of 5V with a maximum load current of 0.1 A. It consists of an internal series regulator that is configured to output a fixed 5V, a Zener Diode, an Error Amp, an Adjustment Pin and a reference voltage pin. The output voltage can be adjusted by connecting a resistor, R1, between the adjustment pin (Adj) and ground.

The MC79L05ACDR2’s operating temperature is -40C to 85C. It requires an input voltage of 7V - 12V, and features a thermal shutdown protection mechanism to protect the components from high temperature. It is also capable of supplying a short circuit protection, over voltage protection and transient protection.

Working Principle

The MC79L05ACDR2 works by sensing the input voltage and comparing it with a reference voltage to form an error voltage. The error voltage is then used to adjust the output voltage to maintain a constant 5V output voltage.

When the input voltage is lower than the reference voltage, the error voltage will increase, causing the series regulator to come on, and reduce the output voltage to maintain a 5V constant voltage. On the other hand, when the input voltage is higher than the reference voltage, the error voltage will decrease, causing the series regulator to turn off and maintain a constant 5V output voltage.

The MC79L05ACDR2 also features an over-current protection. When the current load exceeds the maximum output current of 0.1A, the series regulator will shut off and the device will not be able to provide any output current.

Applications

The MC79L05ACDR2 is widely used in electronic devices, such as smartphones and computers, to regulate the power supply and output a constant 5V. It is also used in industrial instruments, such as process controllers and infrared thermometers, to provide reliable power supplies to ensure safety and accuracy of the instrument readings.

In the automotive industry, the MC79L05ACDR2 is used to provide a steady supply of 5V power to automotive sensors, control units and other electronic components.

Other applications include LED drivers, LCD drivers and voltage shifting in POS terminals.

Conclusion

The MC79L05ACDR2 is a versatile voltage regulator designed to provide a reliable 5V output for various electronic and automotive applications. With its over-voltage protection and thermal shutdown protection, the MC79L05ACDR2 offers a reliable power supply with safety and accuracy.