TPS71H33QPWPR

TPS71H33QPWPR Linear Voltage Regulator Application Field and Working Principle

Linear voltage regulators are widely used in the field of power management and voltage regulation. They are especially suitable for applications that require precise voltage and current control, such as microcontrollers and digital signal processors (DSPs). The Texas Instruments TPS71H33QPWPR is a step-down converter that provides an adjustable output voltage of up to 3.3 V while operating on 6 V to 14 VDC input power. It is widely used in many applications, including medical and industrial instruments, as well as in automotive applications such as windshield wiper motors, window controls and alternators. This article will examine the application field and working principle of the TPS71H33QPWPR.

Application Field

As mentioned, the TPS71H33QPWPR is an adjustable linear voltage regulator, usually used in microcontroller and DSP applications. Its output voltage can be set by an external potentiometer, providing output voltage levels as low as 1.95V and up to 3.3V. The highest current offered is 2A, making it suitable for a wide range of applications, from low-power microcontrollers to light loads.

The TPS71H33QPWPR comes with an integrated high-side MOSFET switch, which allows it to operate in both buck and boost configurations. This makes it suitable for use in applications with highly varying input power requirements, such as a car dashboard that needs to switch between running on 6V and 14V battery power. In addition, the TPS71H33QPWPR also has a low quiescent current of only 36 μA, making it useful in low-power applications.

The TPS71H33QPWPR is also a good choice for automotive applications due to its high load and line regulation. Its high transient load response makes it well suited for fast load changes, which is essential for automotive applications. In addition, it has a low output ripple of only 10 μV, guaranteeing clean output power with minimal noise.

Working Principle

The TPS71H33QPWPR works on the linear voltage regulator principle. It starts by converting the input voltage (6 V-14 V input) to a lower output voltage using a series of transistors, resistors and capacitors. The transistors act as switches, opening and closing to limit the current that flows between the input and output. The resistors and capacitors form a network similar to a ladder, enabling the regulator to maintain a constant output voltage even when there is a sudden change in the input voltage.

The regulator also utilizes an external error-amplification circuit, which is connected to the input power. This circuit amplifies small changes in the output voltage relative to the input voltage, allowing the regulator to adjust itself for optimal voltage regulation. This is known as feedback regulation, and it is the key to achieving precise and accurate voltage regulation.

Finally, the regulator comes with an integrated high-side MOSFET switch, which allows it to operate in both buck and boost configurations. This allows the regulator to maintain a constant output voltage even when the input power drops below 6 V. In addition, the switch also provides over-voltage protection, ensuring that the output voltage remains safe when the input power exceeds 14 V.

Conclusion

The Texas Instruments TPS71H33QPWPR is a versatile and highly reliable linear voltage regulator, suitable for a wide range of applications. It offers adjustable output voltage from 1.95V up to 3.3V, as well as an integrated high-side MOSFET switch for buck/boost operation and over-voltage protection. This makes it ideal for applications requiring precise voltage regulation, such as automotive and medical applications. Its low quiescent current, high load and line regulation, and low output ripple make it a great choice for low-power applications.