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TL750M12QKTTRQ1 application field and working principle

Linear voltage regulators are among the most common type of voltage regulator. TL750M12QKTTRQ1 is a linear voltage regulator with three-terminal release form. It offers the advantages of low quiescent current (10 µA typical) and low dropout voltage (typical 0.575V at 200 mA). This low dropout voltage is important for battery-powered gadgets, such as cell phones, PDAs, and digital cameras.

Working Principle Of TL750M12QKTTRQ1

The TL750M12QKTTRQ1 works on the classic linear regulator principle, relying on a series resistor to drop the excess voltage, which then fed to the load. As shown in the following figure, the TL750M12QKTTRQ1 includes an internal reference voltage source and an error amplifier. The voltage regulator is compared to a negative feedback control system, where the output voltage is compared to the reference voltage and the feedback signal controls the current (in the external pass element). Thus, the output voltage is regulated according to the reference voltage, the current drawn by the load and the characteristics of the external pass element.

As depicted in the aforementioned figure, the TL750M12QKTTRQ1 has an input and output, as well as a signal pin, referred to as adjust. The input is the voltage from the power source to be regulated, such as a battery. The output is the voltage output from the regulator, which will be the same as the input minus the excess voltage that must be dropped across the series resistor. The adjust pin is also known as the feedback pin, it adjusts the output voltage of the regulator in order to match the reference voltage.

When power is supplied to the TL750M12QKTTRQ1, the internal reference voltage source provides a constant reference voltage to the error amplifier. The error amplifier then compares the reference voltage with the feedback voltage from the adjust pin. The error amplifier sends a signal to the pass element that increases or decreases the amount of current drawn by the load, depending on whether the feedback voltage is higher or lower than the reference voltage. The reference voltage will remain constant as long as the load current is kept within the specified range.

Applications

The TL750M12QKTTRQ1 linear voltage regulator is suitable for applications where a low dropout voltage and low quiescent current are desired, such as battery-powered devices. Possible applications include cell phones, PDAs, digital cameras, automotive electronics, and medical devices.

Conclusion

The TL750M12QKTTRQ1 linear voltage regulator is an efficient, low-cost solution for applications that require a low dropout voltage and low quiescent current. It is typically used for battery-powered electronics, such as cell phones, PDAs, digital cameras and other devices. The device works on the classic linear regulator principle, and is essentially a negative feedback control system, with an input and output, as well as an adjust pin, which is used to adjust the output voltage of the regulator so that it matches the reference voltage.

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