LM79L15ACM/NOPB

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Introduction to the LM79L15ACM/NOPB Application Field and Working Principle

The LM79L15ACM/NOPB voltage regulator is a low-voltage and low-power linear regulator developed by Texas Instruments. It is classified as a PMIC (power management IC) voltage regulator and is a member of the LM78L15-LVM family. It is designed to operate at a frequency of 150 kHz and is capable of outputting a constant voltage up to a maximum of 15V.

The LM79L15ACM/NOPB voltage regulator is primarily intended for a variety of portable and desktop electronic devices to ensure stable operation. This can range from providing a steady 5V output to components such as sensors and microcontrollers, to supplying a regulated 12V voltage for the PC board. The device can also be found in automotive applications, particularly for instrumentation systems.

LM79L15ACM/NOPB Working Principle

The LM79L15ACM/NOPB is a low-drop linear voltage regulation device. The working principle of this voltage regulator is simple: it regulates the input voltage source to a desired output voltage. A differential amplifier within the device amplifies the reference voltage present at the device\'s input. This reference voltage will change depending on the load current, such that the regulator regulates its output with minimal load regulation.

The LM79L15ACM/NOPB’s differential amplifier controls the voltage drop across an external pass transistor, known as the series pass element. The voltage drop of the pass element is reduced via the amplifier, thereby causing the output voltage to be regulated to the desired level. This degree of voltage drop is detected by the error amplifier, which adjusts the output voltage by varying it to the voltage drop between the resistor and the base of the series pass element.

The LM79L15ACM/NOPB also utilizes a current mirror circuit to regulate the pass transistor\'s base current using a current sense resistor, which is set at the desired operating point. The operating point of the pass element is also maintained by a thermal shutdown device, located near the device\'s output. This thermal shutdown device is triggered when the temperature of the device’s output exceeds a programmed value, and will reduce the output voltage until the normal conditions are restored.

Conclusion

The LM79L15ACM/NOPB voltage regulator is a versatile device designed to operate at a frequency of 150 kHz, providing a constant voltage up to a maximum of 15V. It is applicable to a variety of portable and desktop electronic devices, and is also ideal for automotive applications. Its working principle utilizes a differential amplifier to regulate voltage drop across an external pass transistor element, and a thermal shutdown mechanism to maintain the desired operating point. With its versatile features, the LM79L15ACM/NOPB is a must-have device for anyone designing a voltage regulation circuit.

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