20A 300W DC-DC Step-Down CC/CV Module — Precision Voltage Conversion with Current Control
Need to step down a 24V battery to 12V, charge a LiPo battery, or power a Raspberry Pi from a vehicle supply? A standard linear regulator would simply turn the excess voltage into wasted heat. This 20A 300W DC-DC step-down module handles the task with up to 96% efficiency, ensuring almost all your energy goes exactly where it’s needed.
Note: While the module is rated for a 20A peak, we recommend limiting the load to ≤15A for continuous, safe operation. If there is a large difference between your input and output voltage, please reduce the load and ensure active cooling is used.
Why choose this model? (Key Advantages):
- 95–96% Real-World Efficiency — At 24V to 12V/20A, it dissipates less than 6W of heat, compared to ~120W with an equivalent linear regulator.
- Dual 75V/80A MOSFETs + Low ESR Capacitors — Keeps output ripple ≤50mV, providing stable power even for sensitive digital circuits.
- Independent CV and CC Adjustment — Separate potentiometers for voltage (1.2–36V) and current limiting (0.2–20A) for precise, interference-free control.
- Automatic Short-Circuit Protection — Self-recovering design; no need to replace fuses or manually reset the device after a fault.
- 30A Screw Terminals & ON/OFF Switch — Quick, secure connections with no soldering or extra adapters required.
- Integrated Dual Heatsinks — Sufficient for passive cooling up to 10–12A; includes a mounting slot for an active fan for loads exceeding 15A.
- EN (Enable) Pin for External Control — Allows for remote ON/OFF switching via logic signals, perfect for automation and microcontroller-based systems.
Performance and Technical Details
The synchronous buck converter topology, powered by dual 75V/80A MOSFETs, ensures rapid switching and minimal power loss regardless of the load. Low ESR capacitors maintain an output ripple of under 50mV, making it clean enough for Arduino, IoT modules, or small-scale audio circuits. Its wide input range (6V–40V DC, with 10–40V recommended) makes it compatible with LiPo batteries, lab power supplies, solar panels, and 12V or 24V automotive systems. Measuring just 60 × 53 × 27 mm, it fits easily into compact enclosures.
| Parameter | Value / Detail |
|---|---|
| Input Voltage | DC 6V – 40V (10V – 40V recommended) |
| Output Voltage | DC 1.2V – 36V continuously adjustable (below 32V recommended) |
| Output Current | Max 20A (≤15A continuous recommended) |
| Maximum Power | 300W |
| Efficiency | ~95–96% (24V to 12V at 20A) |
| Output Ripple | ≤50mV |
| Key Components | Dual 75V/80A MOSFETs, Low ESR capacitors |
| Protection | Self-recovering short-circuit, CC current limiting, overload warning |
| Terminals | 30A screw terminals |
| Control | CV and CC potentiometers, ON/OFF switch, EN pin |
| Dimensions | 60 × 53 × 27 mm |
| Topology | Synchronous Buck Converter (step down) |
Usage Instructions
- Power Connection: Connect the +IN terminal to your positive supply and -IN to the negative. Do not exceed 40V input.
- Setting Output Voltage (CV): Rotate the CV potentiometer to adjust the voltage between 1.2V and 36V. Always verify with a multimeter before connecting your load.
- Setting Current Limit (CC): Rotate the CC potentiometer to set the maximum allowed current (0.2A–20A). Exceeding this value will trigger constant current mode.
- ON/OFF Control: Use the onboard ON/OFF switch or apply a logic signal to the EN pin for automated external control.
- Active Cooling: For currents above 15A or large voltage drops, mount a cooling fan directed at the heatsinks and monitor temperatures.
- Thermal Derating: For maximum longevity, keep the load below 80% of the rated capacity and avoid continuous operation at absolute maximum power.
Package Contents
- 1× 20A 300W DC-DC Step-Down CC/CV Module
Frequently Asked Questions
Can I use this module to charge LiPo or Li-Ion batteries?
Yes. The CC/CV mode is ideal for this. Simply set the float voltage of your battery on the CV dial and the charging current on the CC dial. It works with LiPo, Li-Ion, and LiFePO4, provided you use the correct parameters for your specific battery.
Is active cooling required at all times?
No. Below 10–12A, or when the difference between input and output voltage is small, the integrated heatsinks are sufficient. Add a fan when exceeding 15A or for continuous operation under heavy loads.
What happens if the load exceeds the set current limit?
The module automatically enters CC (Constant Current) mode and reduces the output voltage to maintain the set current. In the event of a short circuit, the protection triggers and will self-recover once the fault is removed.
Can I use this to power a Raspberry Pi or Arduino from a 12V source?
Yes, absolutely. Set the output to 5V or 3.3V. The ≤50mV ripple is clean enough for development boards and IoT modules, and the available current is more than enough for these devices.
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