DC DC Buck Converter Adjustable Power Supply Step Down Module 2A LM2596 Voltage Regulator with Voltmeter LED Display

Parameters: Input Voltage: DC 4-40V, error ±0.1V( note: digital display dose not work when input voltage is under 4v) Output Voltage: DC 1.25V - 37V Output Current: 3A(MAX) It is recommended to use under 2A Function: Built in over-temperature protection function Built in current limit function Built in output short-circuit protection function How to adjust accuracy of input/output voltage: 1. Input and output voltage measurement error calibration function, long press the switch for more than 4 seconds, it will enter the voltage measurement error calibration function. 2. At this time, the in light is on (calibration input terminal), and the digital tube flashes to display the correction value (factory parameter is 0.0) Press the button to change this value (the value range is -0.5~0.5, the unit is V), the positive number indicates upward calibration, and the negative number indicates downward calibration. 3. After adjusting the comparison value of the input end, press and hold the button for more than 2 seconds, and then release the error calibration of the output terminal after releasing the hand. 4. At this time, the out light is on (calibration output end), and the calibration value of the output end is displayed. The adjustment method is the same as the input end. After the comparison value at the output end, press and hold the button for more than 2 seconds. 5. After releasing the hand, save the set value and return to the normal display voltage. The set correction value takes effect immediately and the power is not lost.