4A DC-DC Step-down Adjustable Constant Voltage Module

(13 customer reviews)

In stock

SKU: 405535


1. High-power LED driver.
2. Lithium battery(or lead accumulator) charge.
3. Vehicle-mounted power supply.
4. Low voltage system power supply.
5. 6V, 12V, 14V, 24V battery charge.
6. On-board laptop power supply.
7. Regulated power supply.
8.Low voltage power supply system

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The 4A DC-DC Step-down Adjustable Constant Voltage Module can be used to get adjustable output voltage ranges from 1.5V to 35V. The module provides a wide range of current output up to 4 A. With heat sink mounted it can easily manage to run high power application continuously (provided that for continuous high power output you need to use a cooling fan on the heat sink).

The Module is made from a dedicated benchmark IC and high-precision current sensing resistor, proving a more stable constant current, (when 20°C to 100°C constant current 1A, temperature drift less than 1%); and therefore it is particularly most suitable for LED driver applications. The output current of the module can be raised up to 4A.

To enhance the stabilization in output voltage has four high-frequency capacitance which gives the lower output ripple. Double heat sink design provides easy and fast heat dissipation. MOS Schottky diode independent heat sink, which heat dissipation is good, and won’t affect each other. Also using large size Sendust Core and double pure copper wiring, improve working efficiency, reduce fever.

The module has onboard 3296 multiturn potentiometers for high accuracy voltage and current regulation to provide good stability. As voltage and current are adjustable, it gives very easy to use at multiple Application such as battery charging, LED Driver power supply, Vehicle Power Supply, etc which makes the module Multipurpose and hence this module is always in demand from our maker because of its wide range of application and low cost.

Note: Refer to manual for more info.


1. High-power LED driver.
2. Lithium battery(or lead accumulator) charge.
3. Vehicle-mounted power supply.
4. Low voltage system power supply.
5. 6V, 12V, 14V, 24V battery charge.
6. On-board laptop power supply.
7. regulated power supply.
8.Low voltage power supply system.

Note: If the module temperature exceeds 65ºC, please add a cooling fan,  (It be used at room temperature without a fan)


  1. Scope: High-power LED constant current driver, rechargeable lithium batteries 4V, 6V, 12V, 14V, 24V battery charging; nickel-cadmium nickel-metal hydride batteries (battery) charging, solar panels, wind generators.
  2. Operating temperature: -40 ℃ to + 85 ℃ (please note the actual use of the power tube temperature, the temperature is too high, please enhance heat dissipation).

Package Includes:

1 x 4A DC-DC Step-down Adjustable Constant Voltage Module.

SKU: 405535 Categories: ,
Input Supply voltage (V)

7 ~ 40

Output voltage (V)

continuously adjustable (1.25 ~ 35)

Output Current (A)


Conversion efficiency:


Operating frequency (KHz)


No-load current

Typical 20mA

Load regulation

± 1%

Voltage Regulation

± 1%

Length (mm):


Width (mm):


Height (mm):


Weight (g):


Shipping Weight 0.075 kg
Shipping Dimensions 9 × 6 × 4 cm
15 Days Warranty

This item is covered with a standard warranty of 15 days from the time of delivery against manufacturing defects only. This warranty is given for the benefit of Robu customers from any kind of manufacturing defects. Replacement will be done against manufacturing defects.

What voids warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.

Based on 13 reviews

4.7 overall

Add a review

  1. NARENDRA KUMAR NEGI (verified owner)

    Excellent product. Tested and found perfect.


  2. Sandip halder (verified owner)

    Quality products only?

    Sandip halder

  3. Sandip halder (verified owner)

    Very good quality ?

    Sandip halder

  4. onkarruikar (verified owner)

    7002 mosfet was missing from the circuit, so the red current LED never glowed. All capacitors were off by ~100uF. 🙁


  5. adilahmed786.akhan (verified owner)

    No thermal insulation pad/thermal paste


  6. sadhan biswas

    good product…….

    sadhan biswas

  7. sadhan biswas

    good product …..

    sadhan biswas

  8. adilahmed786.akhan (verified owner)

    no heatsink paste or pad


  9. sg97 (verified owner)

    Made a lab bench power supply with this and a voltage and ammeter combo display!


  10. krishna rajput

    very good and low price product

    krishna rajput

  11. haleshakv (verified owner)

    it’s ultimate guru superb


  12. rajarajangs (verified owner)

    I am using this along with NHP SMPS power supply that produces 24v 10A. The current output or voltage output stays constant after the setting. It can be used for DIY adjustable DC power supply.


  13. kgmdevices (verified owner)

    Fast delivery. Worked as stated. I checked short circuit current of 5A. Perfectly good.



Questions and answers of the customers

  1. 0 votes

    No, the input current of 3A at 12V may not be s... Read more

  2. 0 votes

    It depends if you're providing the input of 30V... Read more

  3. 0 votes
    Q What does it mean when the LED goes from blue to red? answer now
    Asked by divyanshmitra on March 1, 2023 2:26 pm

    When there is a low ampere the LED is blue and ... Read more

  4. 0 votes

    One present is for voltage which ranges from 1.... Read more

  5. 0 votes

    No, you can't remove the current limiting featu... Read more

  6. 0 votes

    Yes, one pot is used for voltage and one is for... Read more

  7. 0 votes


    The input voltage can be in betwe... Read more

  8. 0 votes
    Q can i use it to convert 12v 10a to 24v 10a answer now
    Asked by ht182215 on April 20, 2021 1:26 pm
    Read more
  9. 1 vote
    Q What is the Maximum Power? Can I connect 100 watt 24 v solars as a input? answer now
    Asked by akshaysutar431 on March 30, 2021 12:04 pm

    Maximum power is 350W, In continuation it is 28... Read more

  10. 1 vote
    Answered by the admin

    no, It doesn't have any protection circuit

  11. 0 votes
    Q Can this step down 7.4V 10400mah battery to 5V 6A ? answer now
    Asked by sohail.alamini on October 2, 2020 2:39 am
    A Its maximum capacity is 10 amp. you can sure use i... Read more
  12. 0 votes
    Q can i input 44 volt ( 24 volt solar panel) ? answer now
    Asked by prabhilal on August 20, 2020 8:04 pm
    Answered by the admin

    It doesn't provide output upto 44V and kindly d... Read more

  13. 0 votes

    You can use BMS (Battery management system) in ... Read more

  14. 1 vote
    Q Can this step down 20V 2A to 10v 3a ? answer now
    Asked by bennur.praveen on March 8, 2020 1:46 am

    No, the module can step down 20V to 10V but can... Read more

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Country Of Origin: China