XL4015 5A DC-DC Step-Down Converter – Constant Voltage & Constant Current (CC/CV)

This isn’t just a voltage regulator; it’s a full-featured power supply on a board. Unlike standard buck converters that only control voltage, this module features two potentiometers: one to set the voltage (CV) and one to set the maximum current (CC). This “Constant Current” feature turns the module into a perfect Lithium Battery Charger (set it to 4.2V and limit current to 1A) or a High-Power LED Driver (protecting your LEDs from burning out).