1.2-34V 5A DC-DC Step-Down CC/CV Buck Converter with Volt, Amp & Power Meter — XL4015 Battery Charger & LED Driver with USB Output

More than just a voltage regulator — this XL4015 5A CC/CV Step-Down Buck Converter is a complete adjustable power module with Constant Voltage, Constant Current control, a built-in LED display showing real-time voltage, current, and power, and both screw terminal and USB outputs. Whether you're charging batteries, driving high-power LEDs, building a bench power supply, or regulating solar panel output, this module does it all — and shows you exactly what it's doing on the display.

⚡ Why Choose This Module?

• Dual CC/CV control — Two onboard potentiometers let you independently set the output voltage (1.2V–34V) and current limit (0–5A). The module automatically switches between Constant Voltage and Constant Current modes based on load demand.
• Built-in LED meter — No external multimeter needed. The onboard display cycles through input voltage, output voltage, output current, and output power at the press of a button.
• Dual output connections — Screw terminals for general wiring plus a USB Type-A port for charging phones, powering Raspberry Pi, or any USB device (when set to 5V).
• High efficiency — Up to 96% conversion efficiency at 180 KHz switching frequency means less wasted energy and less heat compared to linear regulators.
• Wide voltage range — Accepts 8V–36V input and outputs 1.2V–34V, covering virtually any DC step-down application.
• Built-in protection — Over-temperature, over-current, short-circuit, and reverse polarity (input) protection keep your module and connected devices safe.

🔧 How CC/CV Works

This module has two operating modes that work together automatically:

• Constant Voltage (CV) mode: The module maintains your set output voltage regardless of load. This is normal operation — like a standard power supply.
• Constant Current (CC) mode: When the load tries to draw more current than your set limit, the module automatically reduces voltage to maintain a steady current. This is essential for safely charging batteries and driving LEDs.

Example — Charging a Li-ion battery: Set CV to 4.2V and CC to 1A. The module starts in CC mode, pushing a steady 1A while voltage rises. When the battery reaches 4.2V, it transitions to CV mode, holding voltage while current tapers off. This is exactly the CC/CV charging profile that lithium batteries require.

🎯 Perfect For

• Battery charging — Li-ion, LiFePO4, lead-acid, and NiMH batteries with proper CC/CV profiles. Set the exact voltage and current for your chemistry.
• LED & laser diode driving — Constant current mode delivers steady, flicker-free current to high-power LEDs and laser diodes regardless of temperature drift.
• DIY bench power supply — Adjustable voltage and current with a built-in display — add a case and binding posts for a fully functional bench supply.
• USB charging station — Set to 5V and use the onboard USB port to charge phones, tablets, or power Raspberry Pi and Arduino projects.
• Solar panel regulation — Stabilize fluctuating solar panel output to a steady voltage for battery charging or direct device power.
• Automotive & marine projects — Step down 12V/24V vehicle power to 5V, 9V, or any voltage your devices need.
• STEM education — The built-in display makes it an excellent teaching tool for demonstrating voltage regulation, current limiting, and power conversion concepts.

📡 LED Display Modes

Press the onboard button to cycle through four display modes:

📐 Specifications

• Converter IC: XL4015
• Type: DC-DC Buck (Step-Down)
• Input voltage: 8V – 36V DC
• Output voltage: 1.2V – 34V DC (adjustable)
• Output current: 0 – 5A peak / 4A continuous recommended
• Minimum dropout: ~1.5V (input must be ≥1.5V above output)
• Conversion efficiency: Up to 96%
• Switching frequency: 180 KHz
• Control modes: Constant Voltage (CV) / Constant Current (CC)
• Adjustment: Two multi-turn potentiometers (CV-ADJ and CC-ADJ)
• Display: LED digital meter (V, A, W, input V) with push-button mode select
• Output connections: Screw terminals + USB Type-A port
• Input connections: Screw terminals (IN+ / IN−)
• Protections: Over-temperature, over-current, short-circuit, reverse polarity (input)
• Operating temperature: −40°C to +85°C
• Board dimensions: ~65mm × 40mm × 20mm

📦 Package Contents

• 1 × XL4015 5A CC/CV Step-Down Buck Converter Module with LED Display

DC power supply, battery, load, and wiring are not included.

📄 Documentation & Resources

• User Guide — Setup, CC/CV Adjustment, Battery Charging & Troubleshooting
• All Power Module Guides