LK112M55TR

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Linear voltage regulators are one of the most widely used PMIC (power management integrated circuits) devices in today\'s markets. There are a variety of linear voltage regulator devices available, each having different features and specifications suitable to the power needs of a particular application. One such voltage regulator is the LK112M55TR. In this article, the application fields and working principle of the LK112M55TR will be discussed.

The LK112M55TR is a linear voltage regulator used for a wide range of applications. It can provide a stable output voltage of 5.0V with an input voltage range of 8V to 12V. It is capable of delivering a maximum current of 1A and can function over an ambient temperature range of -25°C to 125°C. The key features of the LK112M55TR are high input voltage capability, low quiescent current, high surge capability, low drop out voltage, over temperature and over current protections, and high power supply rejection ratio (PSRR).

The LK112M55TR is mainly used in a variety of portable electronics applications such as notebooks, PDA’s, portable media players, set-top boxes, digital cameras and camcorders, LED lighting and power supplies for industrial control systems. Its thermal shutdown, overload protection and over-voltage protection make it reliable and safe for use in these applications. Additionally, it supports a wide range of input voltages, making it suitable for applications powered by AC/DC wall adapters and batteries.

The LK112M55TR is a linear voltage regulator with voltage Reference (VR) technology. This device operates with a fixed reference voltage and regulates the output voltage to a desired level. An external resistor Rsc sets the output voltage. It can also accept an input voltage higher than the rated output voltage, making it suitable for applications in which the input voltage can peak above the rated output voltage.

When the input voltage is higher than the output voltage, it will flow through the pass transistor M1 and the voltage at the drain is regulated via the Rsc network. The LM1117, the voltage regulator, monitors the voltage at the inverting input to compare and compare it to the 1.25V reference voltage. If the drain voltage is made by the Rsc too large, the regulator will reduce it by sending more current to the gate of output transistor M1.

The second pass transistor M2 is used to control the load current. When load current increases, the voltage at the drain of M2 will increase and then the current of the drain-source of M2 will increase too. In this way, the output current is held constant and the excess current is diverted to the ground.

In summary, the LK112M55TR is a highly reliable, versatile and cost-effective linear voltage regulator with a wide range of applications. With its large input voltage range and high surge capability, it is ideal for portable electronics applications. It also features current overload protection, thermal overload shutdown and over-voltage protection, making it a highly reliable device. With its low quiescent current, high power supply rejection ratio (PSRR) and high output current, it is an excellent choice for a variety of applications.

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