DC-DC Step Down 20A 300W Regulator — Description and Usage
Product Overview
This 20A 300W step down module (DC-DC buck converter) is designed for precise and efficient voltage and current regulation between Input 6–40V and Output 1.2–36V. It operates in CC/CV mode (Constant Current / Constant Voltage) and provides essential protections for industrial applications, hobby projects, and electronics repairs. The module integrates dual 75V/80A MOSFETs and low-ESR capacitors for stability and efficiency up to 95–96% (e.g., 24V→12V at 20A).
Main Advantages
High power: up to 300W (20A MAX, recommended up to 15A for continuous operation).
Fine adjustment: voltage and current limit adjustable via CV and CC potentiometers.
High efficiency: up to 95–96% thanks to high-performance MOSFETs and low-ESR capacitors.
Optimized cooling: two integrated heatsinks; active ventilation recommended at high loads.
Easy connection: 30A screw terminals and ON/OFF switch for quick start/stop.
Reliability: self-recovering short circuit protection and overload warning.
Technical Specifications
Feature
Value
Input Voltage
DC 6V – 40V (recommended 10V – 40V)
Output Voltage
DC 1.2V – 36V (continuously adjustable; recommended <32V for long-term operation)
Output Current
Max 20A (recommended ≤15A for continuous use)
Power
300W (max)
Efficiency
~95% (e.g., 24V→12V at 20A)
Output Ripple
≤50mV
Protections
Self-recovering short circuit protection, CC current limiting
Key Components
Dual 75V/80A MOSFETs, Low ESR capacitors
Connection
30A screw terminals
Dimensions
60 × 53 × 27 mm
Functions
CV, CC, EN (enable), ON/OFF
Usage Instructions
Power Connection: connect +IN to the source + and -IN to the source -; do not exceed 40V input.
Voltage Setting: use the CV potentiometer to adjust the desired output voltage.
Current Limiting: adjust the CC potentiometer to set the current limit (0.2A–20A).
On/Off: use the ON/OFF switch or the EN pin to enable/disable the module.
Cooling: for high currents (over 15A), install a fan for active cooling and monitor temperature.
Safety Tips
Do not work on electrical contacts with the power connected.
Do not expose the module to moisture or extreme temperatures.
Reduce power and current when the difference between Vin and Vout is large.
Maintain usage under ~80% of maximum capacity for durability.
Recommended Applications
Electronic projects, testing and troubleshooting, powering modules and boards, adjustable chargers, DC voltage conversions for automotive systems, drones, small industrial equipment.
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