Pololu Shunt Regulator: 33.0 V, 32.8Ω, 3W

Pololu offers a versatile shunt regulator designed to manage excess voltage in motor control applications. These regulators are ideal for scenarios where energy from a motor, typically when slowing down, is returned to the power supply. Fixed and adjustable versions are available, covering voltages from approximately 5V to 35V, and they feature a ±3% accuracy. The shunt regulator is connected in parallel with the power supply, drawing minimal current under normal conditions but activating to dissipate energy during voltage spikes.

In applications without batteries, such as when using a power supply that cannot handle reverse current, these shunt regulators are invaluable. They mitigate the risk of damage to motor controllers and other electronics by limiting voltage spikes. This is particularly beneficial in environments with over-voltage protection, where excessive voltage can cause the power supply to shut down.

Unlike standard transient voltage suppressors, which may lack the precision needed for sensitive power supplies, Pololu's shunt regulators provide a reliable solution. When voltage exceeds the set point, they draw significant current to stabilize the voltage, protecting connected devices.

Pololu's shunt regulators come in various configurations, including fixed set points or adjustable via an onboard multi-turn potentiometer. Options include different shunt resistances and power ratings, with higher-power models featuring additional resistors to handle increased loads.

For those requiring customization, the adjustable versions allow fine-tuning of the voltage set point. This flexibility ensures compatibility with a wide range of applications, making them suitable for both standard and unique power management needs.

To adjust the voltage set point, connect a higher voltage through a current-limiting resistor and measure the regulator's voltage. This ensures precise control and protection, typically setting the regulator around 10% above the desired supply voltage to safeguard against fluctuations.