DC-DC Buck Module 12–75V to 2.5–50V Adjustable 15A Step-Down Regulator
DC-DC Buck Module 12–75V to 2.5–50V Adjustable 15A Step-Down Regulator
DC-DC Buck Power Supply Module — Adjustable Step-Down Voltage Regulator (12–75V to 2.5–50V, 15A)
Take full control of your DC power delivery with this high-efficiency, non-isolated step-down (buck) voltage regulator module. Whether you're powering solar energy systems, wind turbine setups, vehicle electronics, or custom DIY projects, this module provides a stable, adjustable output voltage with up to 95% typical conversion efficiency — keeping energy waste low and performance high.
Key Features
- Wide Input Range: Accepts DC 12V–75V input, making it compatible with a broad range of power sources including solar panels, wind generators, and vehicle battery systems.
- Adjustable Output: Output voltage is user-adjustable from DC 2.5V to 50V. Rotate the onboard potentiometer counterclockwise to increase voltage, clockwise to decrease. Note: output voltage must always be lower than input voltage.
- High Current Capacity: Rated for continuous operation up to 15A; peak up to 25A (max). For sustained high-current use above 15A, a fuse and additional heatsinking are recommended. If operating temperature exceeds 75°C, apply additional cooling or derate usage accordingly.
- Built-In Temperature-Controlled Fan: The onboard cooling fan activates automatically at approximately 45°C (at 12V input), helping to maintain safe operating temperatures during demanding applications.
- High Conversion Efficiency: Typical efficiency of 95% — varies with input-to-output voltage differential and load power.
- 150 kHz Operating Frequency: Ensures clean, stable output with minimal ripple for sensitive electronics.
- Compact & Labeled Design: Measures just 85 × 58 × 38 mm. Clear terminal labels (IN+, IN−, OUT+, OUT−) make wiring fast and straightforward.
- Output Indicator: Built-in output indicator tape provides quick visual confirmation of operation status.
Technical Specifications
| Module Type | Non-isolated Step-Down (Buck) Voltage Regulator |
| Input Voltage | DC 12V – 75V |
| Output Voltage | DC 2.5V – 50V (Adjustable) |
| Continuous Output Current | ≤15A (recommended); 25A peak (max) |
| Operating Frequency | 150 kHz |
| Conversion Efficiency | ~95% (typical) |
| Minimum Voltage Differential | 3V (increases with higher input voltage) |
| Built-In Cooling Fan | Yes — temperature-controlled, activates ~45°C at 12V |
| Input Anti-Reverse Protection | Not included (add 2-pole diode at input if required) |
| Dimensions | 85 × 58 × 38 mm |
| Country of Origin | Made in Mainland China |
Important Usage Notes
- This module does not include a constant-current function — it is not suitable for directly charging large batteries.
- Not compatible with high-power inductive loads as a direct driver.
- For input voltages above 12V, the minimum voltage differential requirement increases beyond 3V.
- Slight color variation from product images may occur due to display/lighting differences. Dimensions may vary ±1–10 mm due to manual measurement.
What's in the Box
- 1× DC-DC Buck Power Supply Module
Helpful Resources
For general electrical safety guidelines relating to low-voltage DC systems, visit the U.S. Consumer Product Safety Commission (CPSC). For energy efficiency standards and information on DC power systems, see U.S. Department of Energy.
Frequently Asked Questions
Q: Can I use this DC-DC buck module with a solar panel system?
A: Yes! This step-down voltage regulator is well-suited for solar and wind power applications. As long as your solar panel or wind generator output falls within the DC 12–75V input range, you can regulate it down to any desired output voltage between 2.5V and 50V to power your devices.
Q: How do I adjust the output voltage on this buck module?
A: Use the onboard potentiometer (adjustment knob): rotate it counterclockwise to increase the output voltage, and clockwise to decrease it. Always ensure the desired output voltage is at least 3V lower than your input voltage, and verify with a multimeter before connecting sensitive loads.
Q: Does this module protect against reversed input polarity?
A: No — this module does not include built-in input anti-reverse protection. If reverse polarity protection is needed, it is recommended to add a series 2-pole diode (Schottky diode recommended for minimal voltage drop) at the input terminals before connecting your power source.
Q: What happens if the module overheats during high-current operation?
A: The module features a built-in temperature-controlled fan that automatically activates at approximately 45°C (at 12V). If the temperature exceeds 75°C under sustained high-current loads (above 15A), you should add external heatsinking or reduce (derate) the load to protect the module and ensure longevity.