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Application Field and Working Principle of PAM3103AABADJ

The term "PMIC - Voltage Regulators - Linear" typically refers to the PAM3103AABADJ, which is a monolithic integrated linear voltage regulator. It is designed to provide regulated output voltages and current with wide range output levels and low noise. It is well suited for applications such as power supplies, motor control, and other equipment where a reliable and efficient voltage source is required.

Features of the PAM3103AABADJ

The PAM3103AABADJ has a wide input range from 8V up to 20V and is capable of delivering 3A current with a maximum power dissipation of 40W. It has an adjustable output voltage ranging from 4.5V to 16V with very low dropout voltage. This linear voltage regulator has a very low input voltage noise and ripple rejection. Its excellent power supply rejection ratio makes it suitable for line powered equipment. Additionally, the PAM3103AABADJ features temperature protection and over-voltage protection. It also has a low supply current of only 6µA in the shutdown mode.

Application Fields of the PAM3103AABADJ

Due to its versatility, the PAM3103AABADJ is suitable for a wide range of applications. It can be used as an auxiliary regulator in linear and switch-mode power supplies, an inverter in automotive and various consumer applications, or as a post regulator in computer and peripheral equipment. Additionally, the PAM3103AABADJ can be used for monitoring and controlling power sources in industrial automation systems and robotics. In medical equipment, it can be used for accurate voltage and current regulation as well as testing.

Working Principle of the PAM3103AABADJ

The PAM3103AABADJ is based on a typical linear regulator circuit. It consists of a reference voltage source and a series pass element. The reference voltage source is established by the zener diode and the resistor network which create a voltage reference. The series pass element is formed by the P-channel MOSFET and includes the error amplifier. The output of the error amplifier will control the gate voltage of the P-channel MOSFET to maintain the output voltage in the range of desired one.

Once the output voltage reaches the desired level, the internal feedback loop will be activated to maintain it. The error amplifier will then compare the actual voltage at the output to the reference and provide a control voltage to the gate of the P-channel MOSFET. If the output voltage rises or falls, the error amplifier will adjust the gate voltage and control the current the series pass element allows, thus maintaining the output voltage at the desired level.

Conclusion

The PAM3103AABADJ is a versatile monolithic integrated linear voltage regulator particularly suitable for applications such as power supplies, motor control, and other equipment. It features wide input range, adjustable output voltage, low dropout voltage, low input voltage noise and ripple rejection, as well as temperature and over-voltage protection. Its working principle is based on the typical linear regulator circuit which consists of a reference voltage source and a series pass element.

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