TPS72101DBVRG4

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Linear voltage regulators are a type of DC regulator that preserves a constant output voltage regardless of the differences in input voltage, load variations, ambient temperature and other fluctuating factors. The TPS72101DBVRG4 Linear voltage regulator is an example of such a device. This article explores its application field and working principle.

The TPS72101DBVRG4 is a High PSRR, Low Dropout Linear Regulator designed to operate over a wide temperature range. It is generally used as an alternate or backup power supply or as a ±5V regulator. With an adjustable output voltage range of 0.8V to 5.5V, it can be used in a variety of applications such as digital or analog circuits, LED displays, LED lighting, ultra-low-voltage applications, audio to digital converters, battery operated products, and other low-power applications. It is available in the small form factor of PowerPAD 3-Pin SOT-23 package.

The working of the TPS72101DBVRG4 is based on a voltage difference between the input voltage and the fixed output voltage. This voltage difference is then segregated into two components, one being the input current that passes through the ground to the output and the other being the erosive loss of energy at the input stage. This concept of voltage control and energy losses is applicable to all linear regulators. Essentially, the main components of the regulator include an operational amplifier, an error amplifier, a voltage reference, a pass device (transistor, diode or MOSFET), and an internal element responsible for compensating the loop of the regulator and thus avoiding oscillations or other inefficiencies.

The functioning of the TPS72101DBVRG4 linear voltage regulator begins with the input voltage being applied to the regulator. The reference voltage is generated and combined with the feedback voltage coming from output. The error amplifier compares the summed up output with the reference voltage and amplifies the difference between them. This amplified voltage is then applied to the pass device that controls the amount of current passing through the regulator. The current passing through the regulator eventually regulates the output voltage. This, combined with the low dropout voltage, helps to ensure a stable regulated voltage.

In conclusion, the TPS72101DBVRG4 is a linear voltage regulator suitable for a range of applications, from LED displays and lighting to ultra-low-voltage applications. The device provides an adjustable output voltage from 0.8V to 5.5V, in addition to its wide temperature range, high PSRR, and low dropout voltage. Working on the principles of voltage control and energy losses, the regulator ensures the production of a stable output voltage by comparing the reference voltage with the feedback voltage, amplifying this difference and controlling the current passing through the regulator.

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