NJM79L15UA

Introduction

NJM79L15UA is a linear voltage regulator that belongs to the product line of PMIC (Power Management Integrated Circuit). It is able to maintain a regulated output voltage at 5V, independent of the input voltage. The regulator consists of an error amplifier and a series pass element, which consists of an internal PNP transistor. This product also contains an auto shut-down circuit, which protects the device when the input voltage goes beyond the specified limit.

Application field

NJM79L15UA can be used in a wide range of applications. It is typically used for regulating the input voltage and providing a stable 5V output. It is often used as a power supply for digital devices like microwave oven,personal stereos, mobile phones, home appliances, and so on. Besides, this voltage regulator can also be used for situations where the output voltage needs to be regulated precisely, such as laboratory power supplies and medical devices.

Working principles

The working principle behind the NJM79L15UA voltage regulator is fairly simple. The input voltage is regulated by a series pass element and an error amplifier. The pass element is a PNP transistor and the error amplifier consists of a fixed reference voltage and a feedback resistor. When the input voltage exceeds 5V, the output voltage is regulated by the feedback resistor. The error amplifier is designed to keep the output voltage at 5V.

The regulator also has an auto shut-down function. When the input voltage exceeds the specified limit, the voltage regulator shuts down and prevents any internal damage to the system.

Conclusion

NJM79L15UA is a linear voltage regulator that belongs to the product line of PMIC (Power Management Integrated Circuit). It is widely used for regulating the input voltage and providing a stable 5V output for digital devices. This voltage regulator is equipped with an error amplifier, a PNP transistor, and an auto shut-down circuit to protect the system from the damage caused by input voltage exceeding the specified limit.