UA7812CKTER Integrated Circuits (ICs)

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PMIC (Power Management ICs) Voltage Regulators, which are sub-categorized as linear Voltage regulators, play a very important role in the power supply of most circuit boards. A typical example is the UA7812CKTER. It is mainly used as a low drop-out linear regulator that provides a regulated output voltage of 12V and is used in various consumer electronic applications such as PC mainboards, PC power supplies, USB power management ICs, and battery chargers.

Features

The UA7812CKTER is a 3-pin device with a single output voltage of 12V and a maximum output current of 1A. It has a wide input voltage range of 2.5V to 18V and an output voltage tolerance of +/- 0.03V. It also has an operating temperature range of up to 125°C, making it suitable for a wide range of applications.

Working Principle

The working principle of the UA7812CKTER is quite simple. It is designed to use a voltage divider and a voltage feedback reference circuit to maintain the output voltage of 12V. The voltage divider consists of two resistors connected in series. The voltage feedback reference circuit monitors the output voltage, compared to a reference voltage (which is typically set to 12V), to control a voltage error amplifier which sends a signal to the adjustable voltage divider. When the output voltage changes, the error amplifier is activated and sends a signal to the adjustable voltage divider, thus adjusting the output voltage of the UA7812CKTER to maintain the reference voltage.

The UA7812CKTER is also able to limit its output current to prevent overloading. This is done by using a current sense resistor connected to the output of the device. As the output current increases, the voltage across this resistor also increases. This voltage is then used as an input to an internal current limiting circuit, which will then adjust the voltage divider to reduce the output current accordingly.

Conclusion

In summary, the UA7812CKTER is a low drop-out linear voltage regulator that provides a regulated output voltage of 12V. It has a wide input voltage range and an output voltage tolerance of +/- 0.03V. It also has an operating temperature range of up to 125°C. It works by using a voltage divider, voltage feedback reference circuit and current limit circuit to maintain the output voltage stability and prevent overloading.

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