The Introduction of LM2596 Step Down Power Module DC-DC Converter





Introduction: The Introduction of LM2596 Step Down Power Module DC-DC Converter

ICStation Team share this LM2596 Step Down Power Module with you in details. We will introduce the features,scope of application,diagram,and testing results.We use the digital storage oscilloscope to test the module and show you the actual testing results with pictures.You will have a full understanding of this module.

1.With voltage meter display;voltage meter error of ±0.1V;the range among 0~40V. (note: to ensure the voltage meter accuracy, please make sure that the input voltage is 4.2V or more).
2.Voltage meter can be closed by long pressing button(minimum power loss).
3.The range of input voltage is 4.2~40V and output voltage is1.25V~37V ,which are continuously adjustable.(The input voltage must 1V higher than output voltage)
4.Maximum output current can be as high as 3A,but normal and stable working current is2A.
5.Use 150KHZ internal oscillation frequency,which is belong to the second generation of switch voltage regulator with low consumption and high efficiency.

Where to use:
1.experiment teaching
2.temporarily set up power supply in the outdoor, electric fan)power supply

What is special:
LM2596 Step Down Power Module design based on XL2596 as main control chip,attached digital tube to display voltage at that time to highlight smart function. What’more, schottky diode provides protection of reverse connection.

What components and tools do you need to do the test:
Copper Wire
Copper Cylinder
Pin Header
Screw Driver
Power Connector

Step 1: Function Introduction

Step 2: Diagram

Step 3: Testing Results:Input Voltage 4.5V

Because the starting voltage is 4.2V, when testing you should set the input voltage 4.5V and the output voltage 1.4V. ICStation Team test it on the digital oscilloscope and the result shows that the actual testing of the product is in accordance with the description.

Step 4: Testing Results:Input Voltage 30V

Because the maximum voltage is 33V,when testing you should set the input voltage 30V and the output voltage 28.6V.The actual measured data is lower than set data of around 0.6V.This may be caused by the output voltage is close to the input voltage or poor power supply accuracy.

In general, the performance of LM2596 Step Down Power Module is very good.You had better set the output voltage 3~4V lower than the input voltage, then the testing results will be more stable.

Thank you for your visiting! Please feel free to share us your comments. :)

Should you meet any problem, please feel free to contact us.

ICStation Team



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    Hi I have a 15 volt battery pack with 4-5amps output can I use this step down transformer to step down the volatage to 5volts 1 amps to charge 18650 battery using TP4056 module.


    Question: would it be possible to modify the output voltage adjustment from a small screw to a regular sized potentiometer where I can put a big knob on it to turn by hand?

    Hi, did you find your answer? If not just to let you know that you can swap the small trim pot for a lager variable resistor.... :)

    Do these buck converters use any current if the output is not connected? Thanks..

    Yes, most of it is burned by the LED that is often integrated into these modules. Destroy the LED and it should go down to a few micro amp.

    I thought this circuit was supposed to produce a constant output V irrespective of the input V (as long as input is higher than output). I connect 12V and tune to 3.3 and when I switch the input to 5V my output drops to 2.8V.

    The dropout voltage can be up to 2V, depending on load and temperature, i.e. you need a minimum of 5.3V for a 3.3V output. Use a regulator or module with a lower droput voltage to convert from 5V to 3.3V.

    Any Help!!?? I connected it to a solar panel with a 19 volt output (I put the wires from the solar panel on the input side of the buck). The input drops to 2.4 volts and the output is 0. I tried turning the pot and nothing. I then tried it with a solar panel that output 6 volts. Same thing.

    what is the power of your panel? I have a 10watts andsucessfully charging a pack of 4 18650 batteries with 16 volts... be carefull to the regulation need to press the right button moderately (neither short, nor long press) setp 1in this tutorial..... minimun srop down voltaje is 1 you will always have 1 volt less than input...

    Hi HilleIP,

    I had exactly the same problem and then I found this information (

    for solar chargers. A step down converter like this can work with a good powerfull solar panel in a very sunny day. If you cannot have that you would need to try a MPPT Solar Buck regulator (see this guy and his excellent videos

    Hope it helps!

    I did a contuinity test at the input terminals. Initially there is a small beep for half of a second. Can anyone explain this ?