300W DC-DC Buck Converter Module — 20A Max, Adjustable 1.2–36V (Input 6–40V) CC/CV - RS1831

Description:

High-power, adjustable DC-DC buck converter module rated up to 300W / 20A. Wide input range and CC/CV operation make it ideal for LED drivers, lithium battery charging, bench supplies, and embedded power solutions. 

Specifications:

• Input Voltage: DC 6-40V (10V to 40V is suggested)
• Output Voltage: DC 1.2-36V
• Output Current: 20A(max.), 15A (suggested)
• Efficiency: 97% (24V to 12V, 20A)
• Output Ripple: ≤50mV
• Wiring Method: Terminal
• Short Circuit Protection: Self-recovery (cannot short circuit for a long time)
• Terminals: Large current screw terminals (30A rated on many modules) for IN/OUT connections.
• Typical Size: PCB with heatsinks. 

Features:

• Wide input voltage: DC 6–40V (recommended 10–40V for best performance).
• Adjustable output: 1.2–36V DC, settable via onboard potentiometer.
• High current: 20A max output (manufacturers commonly advise ~15A continuous without extra cooling).
• High efficiency: Up to 95–97% under favorable conditions (example: 24V → 12V tests).
• Constant Current / Constant Voltage (CC/CV) operation for LED driving and battery charging.
• Protection features: short-circuit / over-current protection (self-recovery), thermal protection recommended.

• Robust construction: large MOSFETs and large screw terminals for high current wiring; often supplied with heat sinks.

Applications / Use Cases:

• LED strip / high-power LED driver (use CC mode).
• Lithium / Li-ion battery charging (use CC/CV with proper charge profile & safety interlocks).
• Bench variable power supply for electronics testing.
• Robotics, embedded systems, motor drivers (with proper filtering & cooling).

Usage & Safety Recommendations (important):

• Set voltage with no load first. Always adjust to the desired voltage without a load connected, then set current limit before connecting the load.
• Cooling: at high currents (>10–15A) use a large heatsink and forced airflow (fan). Continuous 20A operation without adequate cooling can overheat the module or reduce lifespan.
• Wire gauge: use heavy gauge cables for input/output (rated for the expected current) and secure screw terminals tightly.
• Protection: do not permanently short the output; module protection is self-recovering but repeated abuse will damage components.

Pin Description:

• VO+: output positive
• VO-: Negative output
• +IN: Enter the positive polarity
• -IN: Input the negative pole
• CV: Output voltage adjustment
• CC: Output current adjustment
• EN: Enable, low voltage level shut off output; suspension, high voltage level is effective

Package Included:

• 1 x 300W DC-DC Buck Converter Power Module Output Adjustable 20A Max DC-DC 6-40V Step Down to 1.2-36V