3A Adjustable DC-DC Step-Down Converter Power Module

LM2596 DC-DC step-down power supply module 3A adjustable step-down converter voltage regulator 24V 12V 5V 3V 1. Features a voltmeter display with ±0.1V accuracy and a measurement range of 4V to 40V. Note: when input voltage is below 4V, the onboard voltmeter will not function or display. 2. Equipped with a large 5x5 touch button to switch between input and output voltage measurement, with an indicator light showing the selected mode. By default, the digital display shows input voltage with the IN indicator lit. Pressing the button switches the display to output voltage with the OUT indicator lit. The selected mode is saved even after power cycle. 3. The voltmeter can be turned off by long-pressing the button for more than 1 second but less than 4 seconds. To reactivate, simply press the button briefly. 4. Includes terminal blocks for easy connection without soldering, while retaining wire bonding points. Input voltage must be at least 1V higher than the desired output voltage. 5. Operates at a 150kHz internal oscillation frequency, part of the second-generation switching regulator technology, offering low power consumption and high efficiency. 6. Input端 features diode protection to prevent damage from reverse polarity connection. 7. Includes overheat protection and short-circuit protection. For loads exceeding 15W, additional heat dissipation is recommended. How to adjust calibration: Output voltage (or input voltage) calibration steps: Step 1: Press the right button until the "OUT" ("IN") LED is lit, indicating the output (input) voltage is displayed. Press and hold the right button for over 2 seconds, then release. The display and "OUT" ("IN") LED will flash, entering calibration mode. Step 2: Press the right button to increase the displayed value in small increments; press the left button to decrease. Since each step is less than 0.1V, multiple presses (1–5 times) may be needed for a 0.1V change. The number of presses required depends on the current voltage—higher voltages require fewer presses. Step 3: Press and hold the right button for over 2 seconds, then release to exit calibration mode. All settings are saved automatically. Specifications: Input voltage: 2.5V–40V Output voltage: 1.25V–37V (adjustable) Output current: up to 3A Conversion efficiency: up to 92% Output ripple: not specified