XL4015 5A DC-DC Step-Down Converter – Precision Voltage and Current Control for Batteries and LEDs
Need to charge a Li-ion battery safely without the risk of overcharging? Or perhaps you need to power an LED strip at a precise voltage to prevent flickering? The XL4015 module provides independent control over both voltage and current in a compact, easy-to-integrate format, perfect for any electronics project.
Note: The default factory output voltage is approximately 20V. Before your first use, please adjust the potentiometer before connecting your load. If the voltage does not change, rotate the CV potentiometer counter-clockwise for at least 10 full turns — this is a standard initial calibration procedure.
Why choose this model? (Key Advantages):
- Independent Dual CC + CV Adjustment — Independently control output current and voltage via two dedicated potentiometers. This is essential for the safe charging of Li-ion or NiMH batteries and protecting high-power LEDs.
- Up to 96% Efficiency — With less than 4% energy loss as heat, this module ensures stable operation even under continuous load without rapid overheating.
- Automatic Short-Circuit and Thermal Protection — Features built-in 8A current limiting and automatic thermal shutdown, eliminating the need for external fuses.
- Wide Conversion Range — Input 4V–38V, output 1.25V–36V; easily handles common conversions like 24V to 12V, 24V to 5V, or 12V to 3.3V without hardware modifications.
- Compact, Ready-to-Mount Design — Measuring just 51×26×18 mm, it includes an integrated LED status indicator, a pre-installed heatsink, and an operating temperature range of -40°C to +85°C for industrial-grade reliability.
Details and Performance
The XL4015 chip operates at a switching frequency of 180KHz, which is high enough to keep output ripple to a minimum without requiring bulky filtering components. While the maximum rated current is 5A, we recommend limiting continuous use to 4.5A to extend the module’s lifespan. When charging batteries, the module automatically starts in CC (constant current) mode and switches to CV (constant voltage) as the battery reaches the target voltage — the ideal charging profile for this buck topology.
| Parameter | Specification |
|---|---|
| Converter Type | DC-DC Step-Down (Buck) |
| Main Chip | XL4015 |
| Input Voltage | 4V – 38V DC (38V absolute max) |
| Output Voltage | 1.25V – 36V DC (continuously adjustable) |
| Max Output Current | 5A (4.5A recommended for continuous use) |
| Max Power | 75W |
| Efficiency | Up to 96% |
| Switching Frequency | 180KHz |
| Adjustment Mode | CV (Constant Voltage) + CC (Constant Current) |
| Short-Circuit Protection | Automatic 8A limit |
| Thermal Protection | Automatic thermal shutdown |
| Operating Temperature | -40°C ~ +85°C |
| Status Indicator | Integrated LED |
| Dimensions | 51 × 26 × 18 mm |
Programming and Usage Instructions
- Set the output voltage before connecting the load: rotate the CV potentiometer until you reach the desired voltage, verifying with a multimeter.
- Set the current limit via the CC potentiometer: connect a resistive load or an ammeter in series and adjust until you reach the desired current value.
- Initial Calibration (if voltage does not change): rotate the CV potentiometer counter-clockwise for at least 10 full turns, then resume normal adjustment.
- For battery charging: set the CV voltage to the battery’s final charge voltage and the CC current to your desired value (e.g., 0.5C or 1C). The module will automatically transition from CC to CV during the charge cycle.
- Caution: Do not exceed 38V input and ensure adequate ventilation when operating at loads near 5A.
Package Contents
- 1 × XL4015 CC CV DC-DC Step-Down Converter Module
Frequently Asked Questions
Can I use this module to charge a 3.7V Li-ion battery?
Yes. Set the CV voltage to 4.2V and limit the CC current to the battery’s recommended charging rate. The module will automatically manage the CC-to-CV transition during the charging process.
Why is the output voltage ~20V upon first power-up?
This is the factory-preset voltage. Simply rotate the CV potentiometer before connecting your load. If it does not respond, rotate it counter-clockwise for at least 10 full turns to complete the initial calibration.
Is an additional heatsink required?
The module comes with an integrated heatsink. For continuous loads of 4.5A–5A, we recommend using a small fan to maintain safe temperatures and prolong the module’s service life.
Can it power high-power LEDs?
Yes. The CC mode is ideal for high-power LEDs as it prevents overcurrent. Set the CC current to the LED’s rated value and the CV voltage slightly above the LED’s forward voltage.
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