Pololu Shunt Regulator: 13.2V, 1.33Ω, 9W

Pololu's shunt regulators are expertly crafted to manage voltage spikes in motor controllers, particularly when energy is fed back into the power supply during motor deceleration. These regulators are ideal for non-battery applications where reverse current might otherwise damage components. They offer fixed values with ±3% accuracy for common voltages and adjustable options for any voltage between approximately 5V and 35V. Under normal conditions, they draw less than 0.5 mA, but when voltage exceeds the set point, they absorb more current to stabilize the system.

In practical applications, these shunt regulators are perfect for scenarios where regenerative braking is not desired or where the power supply cannot handle reverse current. For instance, in robotics, where precise control over motor operations is crucial, these regulators ensure that voltage spikes do not disrupt the system's performance or harm sensitive electronics.

One of the standout features of Pololu's shunt regulators is their adaptability. With both fixed and adjustable versions, they can be tailored to suit a wide range of voltage requirements. The adjustable models are equipped with multi-turn potentiometers, allowing for fine-tuning of the voltage set point, which is particularly useful in custom or variable voltage applications.

The design of these regulators includes a circuit that monitors voltage and uses a MOSFET to control current flow through a shunt resistance. This setup effectively limits the maximum current the device can sink, providing a reliable safeguard against over-voltage conditions.

Pololu offers a variety of shunt regulators differing in voltage set points and shunt resistances. These variations allow users to select the most suitable model based on their specific power needs and system configurations. Whether it's a 3W, 9W, or 15W model, each is designed to handle occasional short pulses, ensuring robust performance without risk of immediate damage from continuous over-voltage.

For those needing precise voltage control, the adjustable versions of the shunt regulators provide an excellent solution. By using a potentiometer, users can easily set the voltage to be about 10% above the supply voltage, ensuring optimal protection. This feature is particularly beneficial for testing and custom setups where exact voltage regulation is essential.