XL4015 5A DC-DC Step Down Adjustable Power Supply Module – 4V-38V to 1.25V-36V 75W Buck Converter

Product Description

The XL4015 5A DC-DC Step Down Adjustable Power Supply Module is a high-performance non-isolated buck converter designed to efficiently reduce a higher DC input voltage to an adjustable lower output voltage. It is suitable for power-supply development, battery charging, vehicle electronics, LED applications, industrial equipment, and DIY electronics projects.

Based on the XL4015 PWM buck converter, the module operates at a fixed 180 kHz switching frequency, helping provide stable voltage conversion with good line and load regulation. It supports a wide 4V to 38V DC input range and provides an adjustable 1.25V to 36V DC output, making it suitable for a wide variety of voltage-conversion requirements.

The module can handle up to 5A output current and a maximum output power of approximately 75W under suitable operating and thermal conditions. Its conversion efficiency can reach up to 96%, helping reduce energy loss and heat generation during normal operation.

The adjustable output makes the module useful as a custom regulated power supply and, with appropriate voltage and current settings, for suitable rechargeable battery charging applications. Built-in thermal shutdown, current limiting, and output short-circuit protection help improve reliability during operation.

Features

XL4015 high-current buck converter
Non-isolated DC-DC step-down module
Input voltage range of 4V–38V DC
Adjustable output voltage from 1.25V–36V DC
Output current up to 5A
Maximum output power up to 75W
Efficiency up to 96%
Fixed 180 kHz switching frequency
Adjustable output using onboard potentiometer
Thermal shutdown protection
Current limiting protection
Output short-circuit protection
Suitable for battery charging applications
Useful for DIY adjustable power supplies
Suitable for vehicle and industrial electronics
Compact and practical module design

Specifications

Parameter	Specification
Product Type	DC-DC Step Down Buck Converter
Main IC	XL4015
Converter Type	Non-Isolated Buck
Input Voltage	4V – 38V DC
Output Voltage	1.25V – 36V DC (Adjustable)
Output Current	0 – 5A
Maximum Output Power	75W
Switching Frequency	180 kHz
Efficiency	Up to 96%
Operating Temperature	-40°C to +85°C
Protection	Thermal Shutdown, Current Limiting, Short Circuit

Working Principle

The XL4015 module works as a step-down buck converter, converting a higher DC input voltage into a lower adjustable DC output voltage.

The XL4015 switching controller rapidly switches the input power at approximately 180 kHz and regulates the output through PWM control. The output voltage can be adjusted using the onboard potentiometer to match the requirements of the connected load.

The module is suitable only for step-down conversion, meaning the required output voltage must be lower than the applied input voltage.

Adjustable Output

The output voltage can be adjusted from approximately 1.25V to 36V DC using the onboard adjustment control.

This allows the same module to be used for multiple applications, such as:

5V power supplies
9V electronic circuits
12V systems
24V auxiliary supplies
Custom embedded power rails

The selected output voltage should always be verified using a multimeter before connecting sensitive equipment.

High-Current Operation

The module is designed to support up to 5A output current and approximately 75W maximum output power under appropriate conditions.

Actual continuous output capability depends on:

Input and output voltage difference
Output current
Ambient temperature
PCB airflow
Heat dissipation
Duration of operation
Enclosure design

For sustained high-current operation, additional cooling may be required.

Protection Features

The module includes several protection functions:

Thermal Shutdown: Helps protect the converter from excessive temperature.
Current Limiting: Helps limit excessive output current.
Short-Circuit Protection: Helps protect the converter during output short-circuit conditions.

These protections improve reliability but should not be treated as a substitute for correct wiring, suitable cooling, and proper system design.

Battery Charging Applications

The adjustable voltage and current characteristics make this module useful for selected Li-Ion and LiPo battery charging applications when the required charging voltage and current can be correctly configured.

However, the module should not be treated as a complete smart battery charger unless the required charging profile, termination, balancing, and battery-management functions are provided by the overall system.

Always use the correct charging voltage and current for the specific battery chemistry and configuration.

Typical Application Scenarios

DIY Regulated Power Supply

The module can be used to build an adjustable DC power supply from a suitable fixed-voltage adapter, battery, or other DC source.

Battery Charging

Suitable for selected rechargeable battery applications when properly configured with the correct charging voltage and current.

Vehicle Electronics

Useful for stepping down higher DC voltages, such as converting suitable vehicle or industrial supplies to lower voltages required by electronic equipment.

Industrial Equipment

Can provide an adjustable regulated DC rail for compatible control circuits, networking equipment, embedded systems, and prototypes.

LED Applications

Can be used in suitable constant-voltage LED applications where the required voltage and current remain within the module’s operating limits.

Applications

DIY adjustable power supplies
DC voltage regulation
Embedded electronics
Arduino projects
ESP32 projects
Raspberry Pi peripheral power systems
Battery charging systems
Vehicle electronics
Robotics projects
Automation systems
Industrial electronics
Telecom equipment
Networking equipment
LED power applications
Portable electronics
Laboratory prototypes
Custom power conversion
Electronic testing systems

Package Includes

1 × XL4015 5A DC-DC Step Down Adjustable Power Supply Buck Module

Product Disclaimer

Product images are shown for illustrative and representational purposes only. The actual module may vary slightly in PCB colour, component placement, terminal design, potentiometer type, labeling, or other visual details depending on the manufacturing batch.

Input power supplies, heat sinks, cables, batteries, multimeters, enclosures, and other accessories shown in product images are not included unless specifically mentioned in the package contents.

Actual output current and power capability depend on operating conditions and thermal management. The maximum ratings should not be assumed to be continuously achievable without appropriate cooling.

Important Notes

Polarity Warning

This module does not include input reverse-polarity protection according to the supplied product information. Ensure the positive and negative input connections are correct before applying power.

A suitable high-current protection device may be added externally where required.

Thermal Management

For sustained high-current operation, especially above approximately 3.5A or 50W, additional heat dissipation such as an external heatsink and adequate airflow is recommended.

Output Adjustment

Always measure and confirm the output voltage using a multimeter before connecting the module to sensitive electronic equipment.

Step-Down Only

The module can only reduce voltage. The output voltage must be lower than the input voltage for normal buck-converter operation.

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Frequently Asked Questions

1. What is the XL4015 module used for?

It is used to step down a higher DC input voltage to a lower adjustable DC output voltage.

2. What is the input voltage range?

The specified input range is 4V to 38V DC.

3. What is the adjustable output voltage range?

The output can be adjusted from 1.25V to 36V DC.

4. What is the maximum output current?

The module is specified for up to 5A output current under suitable operating conditions.

5. What is the maximum power rating?

The stated maximum output power is approximately 75W.

6. What is the efficiency?

The module can achieve efficiency of up to 96%, depending on operating conditions.

7. Does it support constant-current adjustment?

The supplied specifications describe it primarily as an adjustable buck converter. Verify the exact module version and onboard controls before using it for constant-current charging applications.

8. Can I use it as a battery charger?

It can be used for suitable battery-charging applications when the charging voltage, current, battery chemistry, and charging requirements are correctly configured. Additional battery-management functions may be required depending on the battery pack.

9. Does it have short-circuit protection?

Yes. The module includes output short-circuit protection.

10. Does it have thermal protection?

Yes. Thermal shutdown protection is included.

11. Can I use it with Arduino or ESP32?

Yes. It can be used to generate a suitable regulated supply for Arduino, ESP32, and other electronics when the output voltage and current are correctly configured.

12. Can it convert 24V to 5V?

Yes, provided the input is within the specified range and the required output current and power remain within the module's limits.

13. Does it protect against reverse polarity?

No. The supplied product information states that the module does not have input reverse-polarity protection.

14. Is a heatsink required?

Additional cooling is recommended for sustained high-current or high-power operation, particularly above approximately 3.5A or 50W.

15. Is this a step-up converter?

No. It is a step-down buck converter and cannot increase the input voltage.

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