This DC-DC Adjustable Voltage Step-Down Module is a versatile and efficient solution for converting various DC input voltages to a stable output voltage. Designed for a wide input range from 5V to 27V, it allows output adjustment from 1.25V to 32V, accommodating a variety of applications. For USB applications, the output voltage matches the module’s setting rather than defaulting to 5V, ensuring precise voltage control. In cases where the module’s output mirrors the input voltage and cannot be adjusted, turning the "voltage potentiometer" counterclockwise at least ten times will allow full adjustability. The module is equipped with features such as high efficiency (up to 96%), thermal shutdown, current limiting, and short circuit protection, offering reliable performance. However, it lacks input reverse polarity protection, so if required, a high-current diode should be used in series with the input. Compact and lightweight, this module is ideal for DIY projects and various electronic applications.

1. Use as a Step-Down Module with Overcurrent Protection: Press the right button until the "OUT" LED lights up; the digital meter will show the output voltage. Adjust the “voltage potentiometer” to set the desired output voltage. Press the right button until the digital meter displays the output current. Short the output terminals and adjust the “current potentiometer” to set the overcurrent protection limit (e.g., setting to 4A allows up to 4A output current). Connect the load to the module.

2. Use as a Battery Charger: Determine the battery's float voltage and charging current (e.g., for a 3.7V/2200mAh lithium battery, the float voltage is 4.2V, and the charging current is 2200mA). With no load connected, adjust the “voltage potentiometer” to set the float voltage. Press the right button to display the output current on the digital meter. Short the output terminals and adjust the “current potentiometer” to set the charging current. The module indicates when charging is complete by switching from blue (charging) to green (fully charged) light. Connect the battery for charging (complete steps 1-4 without connecting the battery).

3. Use as an LED Constant Current Driver Module: Adjust the “voltage potentiometer” to set the desired output voltage. Press the right button to display the output current, then short the output terminals. Adjust the “current potentiometer” to set the LED’s operating current. Connect the LED to the module (complete steps 1 and 2 without connecting the LED).