20A 300W DC-DC Step-Down Buck Converter Module CC/CV

20A 300W High-Power DC-DC Buck Converter Module

Product Description

The 20A 300W High-Power DC-DC Buck Converter is a heavy-duty adjustable step-down power module designed for applications requiring high output current and precise voltage regulation. It features separate Constant Voltage (CV) and Constant Current (CC) adjustment controls, making it suitable for battery charging, high-power LED driving, solar power regulation, vehicle electronics, and adjustable power supplies.

The module supports an input voltage of 6V–40V DC and provides an adjustable output of 1.2V–36V DC, with a maximum output current of 20A and recommended continuous current of 15A.

Adjustable CV & CC Control

The module provides independent potentiometers for adjusting:

Constant Voltage (CV)

Allows the output voltage to be adjusted from approximately 1.2V to 36V DC.

Constant Current (CC)

Allows the user to set an output current limit from 0A to 20A, making the module suitable for applications requiring controlled current delivery.

High-Power Performance

The converter is designed for high-power operation up to 300W and uses high-current MOSFETs and low-resistance capacitors for stable power conversion.

With conversion efficiency of up to 97% and output ripple of approximately ≤50mV, it is suitable for demanding DC power applications.

Thermal Management

The module includes two large aluminum heatsinks to help dissipate heat generated during high-current operation. For continuous operation near the maximum rated power, additional forced-air cooling is recommended.

Key Features

• High-power 300W buck converter
• Maximum output current up to 20A
• 15A recommended continuous current
• Adjustable constant voltage (CV)
• Adjustable constant current (CC)
• 6V–40V DC input
• 1.2V–36V adjustable output
• Up to 97% conversion efficiency
• Output ripple ≤50mV
• High-current screw terminals
• Short-circuit protection with self-recovery
• Dual aluminum heatsinks
• LED status indicator
• Suitable for battery and LED applications

Technical Specifications

Feature	Specification
Module Type	Non-Isolated Step-Down (Buck)
Input Voltage	6V – 40V DC
Output Voltage	1.2V – 36V DC Adjustable
Output Current	0A – 20A Max
Recommended Continuous Current	15A
Maximum Power	300W
Efficiency	Up to 97%
Current Limiting	Yes, Adjustable CC
Output Ripple	≤50mV
Dimensions	60mm × 53mm × 30mm

Working Principle

The module converts a higher DC input voltage into a lower adjustable DC output voltage using a non-isolated buck conversion circuit.

The CV control sets the desired output voltage, while the CC control limits the maximum output current. This combination allows the module to provide either regulated voltage or controlled-current operation depending on the application.

Typical Application Scenarios

Battery Charging

Suitable for controlled charging applications for compatible 12V, 24V, lithium, and lead-acid battery systems, when correctly configured for the battery chemistry and charging requirements.

High-Power LED Driver

The adjustable constant-current feature makes it suitable for driving high-power LED arrays.

Solar Power Systems

Can regulate variable DC voltage from solar panels to a lower controlled output voltage.

Vehicle Electronics

Useful for converting higher DC vehicle voltages, such as 24V systems to lower-voltage electronics.

Adjustable Power Supply

Can be used to build a high-current adjustable bench or laboratory power supply.

Applications

• Battery charging
• High-power LED driving
• Solar power regulation
• DC power conversion
• Vehicle electronics
• Adjustable bench supplies
• Motor and actuator power systems
• DIY power electronics
• Embedded power systems
• Industrial DC regulation

Package Includes

• 1 × 20A 300W DC-DC Step-down Buck Converter Module

Product Disclaimer

Product information provided on our website may not be entirely accurate as specifications can vary between manufacturers, suppliers, and production batches. Please verify the actual product specifications before using the module in critical applications.

Product images are for illustrative purposes only and may differ from the actual product in colour, component placement, heatsink size, terminal design, or other visual details.

Important Note

Active Cooling

For continuous operation at high current or near 300W, additional forced-air cooling such as a fan is strongly recommended to prevent overheating.

Input Polarity

The module does not provide reverse-polarity protection according to the supplied product information. Ensure that IN+ and IN- are connected correctly before applying power.

Step-Down Operation Only

This is a buck converter, so the output voltage must always be lower than the input voltage.

Current Rating

The maximum stated current is 20A, while 15A is recommended for continuous operation. Actual performance depends on input/output voltage, cooling, load conditions, and installation.

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