XL4015 5A DC-DC Buck Converter CC CV Lithium Battery Charger LED Driver Module

XL4015 5A step-down module with CC/CV modes, input 5-36V, output adjustable 1.25-32V, max 5A. Up to 96% efficiency, built-in overcurrent, thermal, short-circuit protection. Use as Li-Ion battery charger (4.2V/8.4V/12.6V), high-power LED driver, or general step-down supply. For DIY power, solar charging, ebike battery, 3D printers

XL4015 5A Step-down module Application features:

◆ Main Chip
XL4015 (XLSEMI, synchronous rectification buck converter)

◆ Input Voltage
DC 5V ~ 36V (8V-32V recommended)

◆ Output Voltage
1.25V ~ 32V continuously adjustable (CV mode)

◆ Output Current
0-5A adjustable (CC mode), 7A peak transient

◆ Output Power
Max 75W (50W recommended for continuous use)

◆ Switching Frequency
180kHz

◆ Conversion Efficiency
Up to 96%

◆ Operating Modes

• CV mode: Constant voltage output

• CC mode: Constant current output

• Mode indicator: Red LED lights when in CC mode

◆ Protection Features

• Over-current protection (OCP)

• Over-temperature protection (OTP, shuts down at >150℃)

• Output short-circuit protection (SCP)

• Under-voltage lockout (UVLO, stops below 8V)

◆ Adjustment Methods

• CV potentiometer: Adjust output voltage

• CC potentiometer: Adjust output current/current limit

◆ Module Dimensions
Approx. 61×26×15mm (standard version)

◆ Key Advantages

• CC/CV dual mode for versatile use

• 5A high current capacity

• Up to 96% efficiency, low heat generation

• Multiple protections for safety

• Simple external circuit, easy to use

• Cost-effective, widely adopted

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Quantity(Pieces)	1 ~ 30000	30001 ~ 300000	> 300000
Est. Time(days)	5	7	To be negotiated

FAQ:

1. What is the XL4015 DC-DC buck converter module and its key specifications?
   This is a versatile step-down (buck) converter module built around the XL4015 switching regulator IC. It supports both constant voltage (CV) and constant current (CC) operation, making it suitable as a power supply, lithium battery charger, and high‑power LED driver. Key specifications: input voltage 4 V – 38 V DC, adjustable output 1.25 V – 36 V (always below input), maximum output current 5 A (with adequate cooling), fixed 180 kHz switching frequency, conversion efficiency up to ~95 %, and built‑in over‑temperature, over‑current, and short‑circuit protections. The board includes multi‑turn potentiometers for precise voltage and current adjustment, an LED status indicator (charging/CC/CV mode), and screw terminals for input/output.

2. How does the CC/CV (constant current / constant voltage) mode work on the XL4015?
   The module has two adjustment knobs: one for output voltage (CV) and one for output current limit (CC). In CV mode, the output voltage stays constant at your set value, and the current varies with the load — this is the normal power‑supply mode. In CC mode, the module automatically reduces the output voltage to ensure the current does not exceed the set limit. This is essential for charging lithium batteries (the battery starts at a low voltage and draws constant current until the voltage rises to the set CV level) and for driving LEDs (which require a fixed current, not a fixed voltage). The on‑board LED indicates the operating mode: typically red in CC mode (charging) and green/blue in CV mode (full/constant voltage).

3. How do I adjust the output voltage and current limit on the XL4015 module?
   Before connecting a load, power the module and use a small screwdriver to set the voltage and current. To set the voltage: turn the CV potentiometer clockwise to increase the voltage and counter‑clockwise to decrease, monitoring the output with a multimeter. To set the current limit: short the output terminals (temporarily) through a multimeter in current mode, then turn the CC potentiometer to set the desired maximum current. Never adjust the current limit with a load connected, as this can send excessive current to the load. Because the potentiometers are multi‑turn, adjustments are precise.

4. Can this module charge lithium‑ion batteries? How do I configure it?
   Yes, the CC/CV characteristic makes it an excellent single‑cell or multi‑cell lithium battery charger. Set the CV (output voltage) to the battery’s full charge voltage: 4.2 V for a single Li‑Ion cell, 8.4 V for two cells in series, or 12.6 V for three cells. Set the CC (current limit) to the desired charge current (typically 0.5C to 1C of the battery capacity; for a 3000 mAh cell, set 1.5 A – 3 A). Connect the battery with correct polarity to the output. The module will charge in CC mode first (red LED), then automatically switch to CV mode (green/blue LED) when the battery reaches the set voltage. The module does not have a built‑in charge‑termination circuit, so you must disconnect the battery once fully charged to prevent over‑charging.

5. How do I use the XL4015 as an LED driver?
   High‑power LEDs require a constant current supply, not a constant voltage. To drive LEDs, first calculate the total forward voltage of your LED string. Set the CV potentiometer to a voltage 1 V – 2 V higher than the LED string’s forward voltage (but not more than 36 V). Then set the CC potentiometer to the LED’s rated current (e.g., 1 A or 3 A). Connect the LED string directly to the output — the module will automatically operate in CC mode, limiting the current to your set value. Do not connect LEDs without first setting the current limit; otherwise, they will be destroyed by over‑current.

6. What is the maximum input voltage and output current? Does it need a heatsink?
   The maximum rated input voltage is 38 V DC. The module can deliver up to 5 A of output current, but sustained operation at 5 A requires additional cooling. The XL4015 chip uses the PCB copper area as a heatsink. For currents up to 2 A – 3 A, passive cooling is usually sufficient. For 4 A – 5 A, you must attach a small aluminium heatsink to the chip and ensure good airflow. The built‑in thermal protection will reduce the output if the chip temperature exceeds about 150 °C. The total output power should be kept below 50 W – 75 W depending on ventilation.

7. What is the typical efficiency, and why does the module get hot?
   The XL4015 can achieve a peak efficiency of up to 95 % under optimal conditions (moderate load, small voltage difference). Efficiency drops at very light loads and at high input‑output voltage differences. The 180 kHz switching frequency means the inductor and diode generate some heat. At 5 A, even with 90 % efficiency, several watts are dissipated as heat. The chip and the Schottky diode are the main heat sources. Ensure the module has adequate ventilation; for long‑term high‑power use, a heatsink is strongly recommended.

8. What protection features does the XL4015 chip include?
   The XL4015 provides cycle‑by‑cycle over‑current limiting, over‑temperature protection (thermal shutdown at ~150 °C), input under‑voltage lockout, and short‑circuit protection. The module itself does not include reverse‑input‑polarity protection or output over‑voltage protection. Always double‑check wiring before applying power. For battery charging applications, an external fuse or circuit breaker is recommended for additional safety.

9. How does the XL4015 module differ from the XL4005 or LM2596?
   The XL4015 provides up to 5 A output current, higher than the XL4005 (5 A as well but different chip characteristics) and significantly more than the LM2596 (typically 2 A – 3 A). The XL4015 also includes a dedicated CC/CV mode with a current‑limit potentiometer, making it far more suitable for battery charging and LED driving than a basic LM2596 module, which only has voltage adjustment. The LM2596 operates at 150 kHz and uses a larger inductor; the XL4015’s 180 kHz frequency allows a slightly smaller inductor. The XL4015 module is the preferred choice when you need a compact, adjustable CC/CV power supply with up to 5 A capability.

10. Can I use this module to charge a lead‑acid battery or a LiFePO4 battery?
    Yes, the CC/CV characteristic is suitable for sealed lead‑acid (SLA) batteries. Set the CV to the float charge voltage (e.g., 13.6 V for a 12 V SLA) and the CC to an appropriate fraction of the battery’s Ah rating. For LiFePO4 batteries, set the CV to 3.6 V per cell (e.g., 7.2 V for a 2‑cell pack). As with lithium‑ion, the module does not terminate charging automatically; you must monitor the battery and disconnect it once fully charged.

11. What are the most typical applications for the XL4015 CC/CV buck module?
    It is extremely popular in DIY lithium battery chargers (for 18650, 21700, and Li‑Poly packs), high‑power LED drivers (for LED strips, COB LEDs), adjustable bench power supplies, solar charge controllers (with a suitable panel), and automotive DC‑DC converters. Its ability to precisely limit both voltage and current makes it a versatile all‑in‑one power module for hobbyists and professionals alike.