300W DC-DC Buck Converter 20A Step-Down Module | LED Driver
300W DC-DC Buck Converter 20A Step-Down Module | LED Driver
300W DC-DC Buck Converter – 20A Constant Current Step-Down Module
This 300W DC-DC Buck Converter is a high-efficiency, adjustable step-down power module designed for electronics projects, LED driver applications, battery charging, and custom power supply builds. With a broad input voltage range and precision output control, it's an ideal solution for hobbyists, engineers, and makers who need reliable, stable DC power conversion.
Key Features
- Wide Input Range: Accepts 6V to 40V DC (10V–40V recommended for best performance)
- Adjustable Output: Output voltage adjustable from 1.2V to 36V DC; output current up to 20A (15A suggested for sustained use)
- High Efficiency: Up to 95–96% efficiency (tested at 24V to 12V, 20A) — minimal energy waste and heat generation
- Dual MOS Tube Design: Built with a 75V/80A large-current dual MOS tube for robust, stable switching performance
- Low Ripple Output: High-frequency, low-resistance electrolytic capacitors on both input and output keep ripple to ≤50mV for clean, stable power
- 30A Screw Terminals: Large-current screw terminals make wiring fast, secure, and convenient
- Dual Heat Sinks: Two integrated heat sinks significantly improve thermal dissipation for extended operation
- Self-Recovery Short Circuit Protection: Built-in protection automatically recovers — avoid sustained short circuits
- Enable Pin (EN): Low voltage level shuts off output; suspension/high voltage level enables output
- Constant Voltage & Constant Current Modes: CV and CC adjustment pots allow independent control of output voltage and current
Technical Specifications
| Input Voltage | 6V – 40V DC (10V–40V recommended) |
| Output Voltage | 1.2V – 36V DC (adjustable) |
| Output Current | 20A max (15A suggested continuous) |
| Maximum Power | 300W |
| Efficiency | Up to 95% (24V→12V at 20A) |
| Output Ripple | ≤50mV |
| Wiring Method | Screw Terminal (30A rated) |
| Short Circuit Protection | Self-recovery (avoid prolonged short) |
| Dimensions | 60 × 53 × 27 mm / 2.36 × 2.08 × 1.06 in |
| PCB Color | White |
Terminal Guide
- VO+ – Output positive
- VO− – Output negative
- +IN – Input positive
- −IN – Input negative
- CV – Output voltage adjustment
- CC – Output current adjustment
- EN – Enable pin (low = output off; high/suspend = output on)
Important Notes
- When there is a large difference between input and output voltage, reduce power and current to avoid overheating.
- Do not sustain a short circuit — self-recovery protection is designed for momentary events only.
- Common-grounded input/output: no-load CV provides constant voltage; CC provides constant current.
Made in Mainland China.
For more information on electrical safety standards for low-voltage electronic modules, visit the U.S. Consumer Product Safety Commission – Electrical Safety.
Learn more: DC-to-DC converter
Frequently Asked Questions
Q: What is the maximum continuous output current for this DC-DC buck converter module?
A: The module supports a maximum output current of 20A, but for sustained, long-term use it is recommended to operate at 15A or below to ensure safe thermal performance and module longevity.
Q: Can this buck converter be used as an LED driver?
A: Yes. This step-down module features a dedicated constant current (CC) adjustment mode, making it well-suited for driving high-power LED arrays. Simply set the output current to match your LED's rated current using the CC potentiometer.
Q: What input voltage range does this 300W step-down module accept?
A: The module accepts an input voltage of 6V to 40V DC. For optimal and stable performance, an input range of 10V to 40V DC is recommended.
Q: Does this module have overload or short circuit protection?
A: Yes, it includes self-recovery short circuit protection. However, it is not designed for prolonged short circuit conditions — momentary shorts will auto-recover, but extended shorts should be avoided to prevent damage.