LM78M24CT

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Linear voltage regulators are the most widely used form of voltage regulation with the LM78M24CT being one of the most popular linear voltage regulator ICs. It is capable of supplying up to 24 volts of output current to a load ranging from 0.1A – 0.8A. This device is also capable of withstanding high temperatures and wide input voltages, making it suitable for a variety of applications.

Application Field of LM78M24CT

The LM78M24CT offers impressive power regulation in a wide range of applications. This device is primarily used for regulating the output of DC-DC converters, located in the power supplies of computers and other related devices. It is also a popular choice for powering microcontrollers and other digital circuits, with low current outputs.

The thermal design of the device makes it suitable for voltage regulation and current limit operations in various industrial and factory automation applications. Additionally, the LM78M24CT can also be used in portable electronics and other applications that require a stable output voltage.

Working Principle of LM78M24CT

The LM78M24CT is a three-terminal adjustable voltage regulator that utilizes negative-feedback circuit topology to regulate the output voltage. This device is primarily designed as a “regulated current source”, as it controls the output current rather than the input voltage. This is achieved by sensing the output current using an internal reversing current monitor (RIM) and controlling the output voltage based on the RIM’s measurements.

To measure the load current, the LM78M24CT first sets an internal preset voltage across the RIM. Subsequently, the RIM performs a series of measurements on the current flowing through it. When the load’s current changes, the RIM compensates the voltage drop across itself automatically. The compensation acts as a feedback loop that causes the output current of the regulator to remain constant.

The LM78M24CT includes an embedded Over-Current Protection function. During turn-on, the OCP monitors the output current of the device by measuring the potential across the output resistor. Once it detects that the output current has exceeded the preset OCP threshold, the device turns off the output for a duration that depends on the setting of the current limit. Additionally, the device also includes short-circuit protection, which will stop the output in the event of a short-circuit, and thermal overload protection.

Conclusion

The LM78M24CT offers impressive features and is suitable for a variety of applications, making it one of the most popular voltage regulator ICs. It utilizes negative-feedback circuit topology to regulate the output current via an internal reversing current monitor. Additionally, the device has embedded protection features such as Over-Current Protection, short-circuit protection and thermal overload protection.

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