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NJM78L05L2A Application Field and Working Principle

NJM78L05L2A is a Low Dropout (LDO) Linear Voltage Regulator IC that offers both low ripple rejection and low noise, making it ideal for many applications. The NJM78L05L2A is a three-pin Positive LDO Voltage Regulator with a maximum output current of 100mA, allowing it to be used in a range of applications that require a clean, well-regulated power supply.

Application

Due to its wide input voltage range of up to 15V, the NJM78L05L2A is perfect for a multitude of applications. It is widely used for powering up logic circuits, such as micro-processors, memory and logic circuits, sensors and motor drivers. The low dropout voltage of the NJM78L05L2A also makes it ideal for applications with a higher input voltage, such as those found in automotive applications. Additionally, the NJM78L05L2A can be used in power supplies for audio applications, such as amplifiers, pre-amplifiers and music synthesizers, due to its low ripple and low noise output. Furthermore, the NJM78L05L2A can be used as a low dropout reference regulator which provides several points of regulation.

Working Principle

The working principle of the NJM78L05L2A is relatively simple. The device is a linear voltage regulator that uses the voltage difference between its input voltage (Vin) and its output voltage (Vout) to regulate its output. The voltage at the output is determined by two components. The first is a fixed reference voltage, which is established by the internal Zener diode, and the second is a voltage divider, which is created out of two resistors (R1 and R2).

In order to obtain the desired output voltage from the NJM78L05L2A, the voltage divider must be adjusted to match the desired output voltage. The output voltage is then determined by the ratio of the two resistors, i.e. output voltage = reference voltage x (R1/R2). Furthermore, the NJM78L05L2A has an internal series pass transistor, which is used to control the output current. When the output current exceeds the safe limit, the internal transistors will automatically limit the output current.

Conclusion

The NJM78L05L2A is a low dropout linear voltage regulator that is ideal for many applications. With its wide input voltage range of up to 15V, and low dropout voltage, it can be used in automotive and audio applications, as well as for powering up logic circuits and reference regulator applications. Its working principle is relatively simple, and it requires the adjustment of its voltage divider in order to obtain the desired output voltage. Overall, the NJM78L05L2A is a valuable component for many applications.

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