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MC78M05ACT Application Field and Working Principle

As a member of the Linear Voltage Regulators (PMIC - Voltage Regulators - Linear) family, the MC78M05ACT is a voltage regulator designed by ON Semiconductor. It is a 5 V fixed output, low dropout voltage regulator, available in TO-220 and TO-263 (D2PAK) packages. It is suitable for many applications where low dropout, low noise, and good line and load regulation is needed. The regulator allows current up to 1A and features current limiting, overvoltage protection and an active pull-down on the enable pin.

Application Field

The MC78M05ACT is suitable for many applications. It can be used in power supplies, including low noise and fast transient response applications, such as computer peripherals like monitor, laser printers or any device that requires low noise, low power and low dropout voltage regulators. With its low dropout voltage feature, the MC78M05ACT is also suitable for automotive, industrial, telecommunications and other applications.

Features and Benefits

The main features and benefits of the MC78M05ACT are: Presence of an enable pin for logic-level shutdown, Low dropout voltage of only 1.4 V at any load current up to 1 A, Internal current limiting and thermal shutdown for over-current protection, Low output noise, and Low quiescent current.

Working Principle

The MC78M05ACT is a linear voltage regulator, as in all linear voltage regulators, it uses a pass element to control the voltage between two terminals, the input-VDD and the output-VOUT. It works by comparing the input voltage VDD to a reference voltage. If the input voltage is higher than the reference voltage, then the difference becomes a voltage across a resistor, called pass element. This voltage causes a current to flow through the pass element, and this current is used to deliver an output voltage. The regulator is designed to have constant and stable output voltage by compensating for any fluctuations in the input voltage. This is done by increasing or decreasing the current through the pass element in order to keep the output voltage constant.

Conclusion

The MC78M05ACT is a 5 V fixed output, low dropout voltage regulator. It is suitable for many applications where low dropout, low noise, and good line and load regulation is needed. Its features include an enable pin for logic-level shutdown, low dropout voltage of only 1.4 V, internal current limiting and thermal shutdown, low output noise and low quiescent current. As a linear voltage regulator, it works by comparing the input voltage VDD to a reference voltage and then adjusting the current through the pass element to keep the output voltage constant.

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