LM2596 BUCK 3A DC-DC Voltage Adjustable Step-Down Power Module + Blue LED Voltmeter

Link: https://pan.baidu.com/s/1rZovdGvsCxjvuPFgngGz9A

Extraction code: 1234

Product parameters

Input voltage: 2.5～35V

Output voltage: 1.25V～35V

Output current: 3A

Conversion efficiency: 92%

Output ripple: <30mV

Switching frequency: 150KHz

Working temperature: -45℃~+85℃

Size: 66*36*14mm

Features:

Features:

1. With voltmeter display, voltmeter error is ± 0.1V, range is 4 ～ 40V. (Note: the input voltage is lower than 4V, the onboard voltmeter does not work and does not display)

2. Large volume 5 * 5 touch the button to switch between measuring input or output voltage, and an indicator light shows which terminal voltage is being measured. By default, the digital tube displays the input voltage and the input indicator IN is on. When the button is touched, the digital tube displays the output voltage and the output indicator OUT is on. And keep the last setting, even after power off

3. The voltmeter can be turned off. Press and hold the switch for more than 1 second and less than 4 seconds. After the voltmeter is turned off, just press the switch briefly to turn on the voltmeter.

4. The input and output voltage measurement error calibration function, long press the switch for more than 4 seconds, and enter the voltage measurement error calibration function after releasing the hand. At this time, the IN light is on (calibrating the input terminal), and the digital tube flashes to display a more positive value (factory parameter is 0.0). At this time, you can change this value by pressing the button shortly (the value range is -0.5 ～ 0.5, the unit is V). A positive number indicates upward calibration, and a negative number indicates downward calibration. After adjusting the calibration value of the input terminal, press and hold the button for more than 2 seconds, and enter the error calibration of the output terminal after releasing. At this time, the OUT light is on (calibrating the output terminal), and the calibration value of the output terminal is displayed. The adjustment method is the same as that of the input terminal. After the calibration value at the output end, press and hold the button for more than 2 seconds, and save the set value and return to the normal display voltage after letting go, the set correction value will take effect immediately and will not be lost after power failure. (With this function, you can meet your higher accuracy requirements)

5.With terminal block, it is convenient to use without soldering iron, and the welding wire connection point is reserved

(The input voltage must be more than 1v higher than the voltage to be output)

6. The maximum output current can be as high as 3A. It is recommended that the working current be about 2A.

7. It adopts the internal oscillation frequency of 150KHz, which belongs to the second-generation switching voltage regulator, with low power consumption and high efficiency.

Scope of application

This module can be used in step-down fields where the input voltage is higher than the output voltage, such as batteries, power transformers, DIY adjustable regulated power supplies, 24 car pen-based power supplies, industrial equipment step-down, 12V to 3.3V, 12V to 5V, 24V to 5V, 24V to 12V, 35V to 24v, etc.

Self-calibration method of on-board voltmeter:

1. Input and output voltage measurement error calibration: long press the switch for more than 4 seconds, and after letting go, it will enter the voltage measurement error calibration function. At this time, the IN light is on (calibration input terminal), and the digital tube flashes to display the positive value (the factory parameter is 0.0 ), at this time, short press the button to change this value (the value range is -0.5～0.5. The unit is V), a positive number means upward calibration, and a negative number means downward calibration. After adjusting the calibration value of the input terminal, press and hold the button for more than 2 seconds. After letting go, enter the error calibration of the output terminal. At this time, the OUT light is on (calibration output terminal), and the calibration value of the output terminal is displayed. The adjustment method is the same as that of the input terminal. After the calibration value of the output terminal, press and hold the button for more than 2 seconds. After letting go, save the set value and return to the normal display voltage. The set correction value will take effect immediately and will not be lost after power failure. (With this function, you can meet your higher precision requirements)

2 Turn off the voltmeter: Press and hold the switch for more than 1 second and less than 4 seconds, and then let it go to turn it off. After the voltmeter is closed, simply press the switch to turn on the voltmeter.

Some customers reported that the output voltage of the module cannot be adjusted and is always equal to the input voltage. When you encounter this kind of problem, please turn the potentiometer counterclockwise for more than 10 turns, and then use the module to adjust the voltage normally. Because when the step-down module leaves the factory, the default output voltage is about 20V.

Module usage tutorial:

1. The input and output voltage measurement error is more accurate: press and hold the switch for more than 4 seconds, and the voltage measurement error comparison function is entered after releasing the hand. At this time, the IN light is on (calibrating the input end), and the digital tube flashes to display a more positive value (the factory parameter is 0.0 ), At this moment, press this button to change this value (the value range is -0.5 ～ 0.5, the unit is V), positive number means upward calibration, negative number means downward calibration. After adjusting the calibration value of the input terminal, press and hold the button for more than 2 seconds, and enter the error calibration of the output terminal after releasing. At this time, the OUT light is on (calibrating the output terminal), and the calibration value of the output terminal is displayed. The adjustment method is the same as that of the input terminal. After the calibration value at the output end, press and hold the button for more than 2 seconds, and save the set value and return to the normal display voltage after letting go, the set correction value will take effect immediately and will not be lost after power failure. (With this function, you can meet your higher accuracy requirements)

2. Turn off the voltmeter: long press the switch for more than 1 second and less than 4 seconds, you can turn it off with a loose hand. After the voltmeter is turned off, just press the switch briefly to turn on the voltmeter.

Precautions:

1. It is recommended to use a heat sink to enhance heat dissipation when the power usage exceeds 15W.

2. Some customers report that the module output voltage cannot be adjusted and is always equal to the input voltage. When you encounter this problem, please turn the potentiometer counterclockwise more than 10 times before using the module to adjust the voltage normally. Because when the buck module leaves the factory, the default output voltage is about 20V.