DC-DC Buck Converter Step-down 5-40V to 1.2-35V 300W 9A


Input Voltage 6-40VDC
Output Voltage Continuously adjustable (1.2-35VDC)
Output Current 20A for long time within 15A
Low Dropout 3V
Working Frequency 150KHZ
Conversion Efficiency About 96%
Output Ripple Ripple around 50mV (no noise)
Working Temperature -10°C to +75°C
Output Short Circuit Protection Yes (instantaneous protection)
Output Anti-backflow None (additional 2-pole tube required for load self-charged or inductive load)

Out of stock

SKU: SKU0008 Category:

Introducing our cutting-edge DC-DC Step-Down Charging Module, a versatile and high-performance solution tailored to meet your power supply needs with precision and reliability. Designed with advanced features and robust specifications, this module offers unparalleled efficiency and stability for a wide range of applications, from high-power LED drivers to lithium battery charging systems. With its compact dimensions and comprehensive functionality, our module stands out as the ideal choice for demanding power supply tasks. Explore its exceptional capabilities and elevate your projects to new heights of performance and efficiency!


Dimensions 65mm (length) x 47mm (width) x 23.5mm (height)
Module Properties Non-isolated step-down constant current, constant voltage (CC CV) charging module
Input Voltage DC 7-32V
Output Voltage (1) DC 0.8-28V continuously adjustable
(2) Fixed output: Choose between 0.8V-28V
Output Current 9A (cooling fan recommended if power tube temperature exceeds 65°C)
Constant Current Range 0.2-9A (adjustable)
Turn Lamp Current Constant current value * 0.1 (e.g., if constant current is 3A, turn lamp current is 0.3A)
Lowest Pressure 1V
Output Power Approximately 300W
Conversion Efficiency Up to about 95%
Operating Frequency 300KHz
Output Ripple 20M bandwidth
Input 24V Output 12V 5A ripple around 50mV (Excluding noise)
Output Short Circuit Protection Yes, constant current
Input Reverse Polarity Protection None
Output Prevent Backflow None
Wiring Terminal
No-load Current Typical 20mA (24V switch to 12V)
Load Regulation ± 1% (constant)
Voltage Regulation ± 1%
Dynamic Response Speed 5% in 200uS
Potentiometer Adjustment Clockwise (increase), counterclockwise (decrease)
Operating Temperature Industrial grade (-40°C to +85°C)


  • High-power LED driver.
  • Lithium battery (or lead-acid battery) charging.
  • Vehicle-mounted power supply.
  • Low voltage system power supply.
  • Charging for 6V, 12V, 14V, 24V batteries.
  • On-board laptop power supply.
  • Regulated power supply.
  • Low voltage power supply system.