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<div><p>Output Voltage: 1.25-30V (Adjustable) Input reverse polarity protection: Yes, Package included:1pc DC/DC Constant Current / Constant Voltage Module Constant current range: 0.2-3A (adjustable, default transferred 1A) Output short circuit protection: Yes, constant current (constant current setting values) Type: DC/DC Constant Current / Constant Voltage Turn lamp current: constant current value * (0.1), turn the lamp current constant current value Linkage Size: (L*W*H)4.80*2.30cm/1.89"*0.94" Output Current: rated current 2.5A/ 3A MAX ( Heat-sink Needed) Input Voltage: 5V-57V input voltage must be higher 2V than the output voltage Output Power: 15w max at maximum voltage Description: This module is an adjustable step-down module. The output voltage can be changed by adjusting the blue adjustable resistor on the module. The input and output voltage difference is 2V, and the minimum output voltage is 1.23V. The IN- (input negative), IN + (input positive), OUT- (output negative), OUT + (output positive) marked on the module must be connected correctly, otherwise the module may be damaged. Features: Stepless adjustment of the output voltage Stepless adjustment of the output current LED indicator, Red under load / Green on load free Multiturn potentiometer with long life Up to 1.5V (Typ. 1.16V) difference between the input and output voltages Up to 2.5A output current Very low power consumption at idle, about 10mA (0.01) Temperature protection Input voltage to 60V High stability of the output voltage High efficiency No need additional cooling to 2.2A High frequency DC/DC conversion, leading to size reduction of the device Application: Charger for all batteries in the range 1.23V ~ 28V, only set the precise battery voltage and charging current High conversion when used in car Adjustable laboratory voltage source LED driver with constant current Dimming devices Laboratory power supply Battery charging 1. Determine the floating voltage and charging current of the battery you need to charge, and the input voltage of the module; 2. Adjust the constant voltage positioner to adjust the output voltage to about 5V. 3. Use the multimeter 10A current block to measure the output short-circuit current, and at the same time adjust the constant current potentiometer to make the output current reach the predetermined charging current value; 4. By default, the charging lamp current is 0.1 times the charging current (constant current value). If you need to adjust, please adjust the lamp current potentiometer; (usually no adjustment) 5. Adjust the constant voltage positioner to make the output voltage reach the floating charge voltage; 6. Connect the battery and try charging. (Steps 1, 2, 3, 4, and 5 connect the module input to the power supply, and the output is not connected to the battery.) LED constant current drive 1. Determine the working current and maximum working voltage you need to drive the LED; 2. Adjust the constant voltage positioner to adjust the output voltage to about 5V. 3. Use the multimeter 10A current block to measure the output short-circuit current, and adjust the constant current potentiometer to make the output current reach the predetermined LED working current; 4. Adjust the constant voltage positioner so that the output voltage reaches the maximum working voltage of the LED; 5. Connect the LED and test the machine. (Steps 1, 2, 3, and 4 connect the module input to the power supply, and the output is not connected to the LED light.) Note: Size for manual measurement, there may be a 0 to 2 cm error, belongs to the normal phenomenon. And due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!</p></div>