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

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

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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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    27 Discussions

    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?

    1 reply

    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..

    1 reply

    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.

    1 reply

    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.

    2 replies

    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!


    2 years ago

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

    1 reply

    The input capacitor when discharged acts as a short circuit until it charges. Since the ohms function on a multimeter uses a small amount of current the "capacitor short circuit" will cause the beep. As the cap charges there is no more current flowing thru the capacitor and the beep ends.

    It sounds like the current output of your Solar Panel is insufficient to drive the module. It may require a group of panels in parallel to provide sufficient current.

    2 replies

    is there anything else to do instead of connecting bunch of panels??

    You could add a rechargeable battery in parallel with the solar array, The battery would make up the difference in current the array cannot supply. However this would mean that some times during the daylight hours you would have to shut off the unit so the solar array could recharge the battery

    Cual es su rango máximo de voltaje, deseo poner en el IN=54Vdc y el OUT= 24VDC a 3A sera que sirve...

    1 reply demasiado!...el maximo es 33volts..y se recomienda no pasar de 30 volts..

    You should be able to get one off amazon, ebay, etc. read the number off it. Should be IN1508 or similar designation


    2 years ago

    I need isolation. Do you know of a similar isolated supply?