Features: With USB port which can easily charge your digital products. The output voltage of the USB port of this product is not a fixed standard 5V voltage, but an adjustable voltage, ranging from 1.25 to 32V. High-power constant current LED driver. 2 modes of constant voltage and constant current, with an indicator light indicates which mode the module is in. Used as a lithium battery charger, the floating charging voltage and charging current can be set, and there is an indicator indicating whether it is being charged or full. With limited current protection function, even if the output short circuit will not burn out the module. Specification: Input voltage: 5-36V Output voltage: 1.25V-32V (adjustable) Output current: Max.5A Recommended for use within 4.5A (adjustable) Output power: Max.75W Recommended for use within 50W Working temperature: -40~85℃ Frequency: 180KHz Conversion efficiency: Max.96% Weight: Approx.37g/ 1.3oz Package List: 1 * Module 1 * Heat sink 4 * Screw set Usage: (1)As a general step-down module with over-current protection ability 1. Press the right button to adjust the digital meter to the "display output voltage" interface and adjust the "constant voltage potentiometer" to make the output voltage reach the desired value. 2. Adjust the digital meter to the "display output current" interface and find a thick lead stub for the output of the module. Adjust the "constant current potentiometer" to make the current value on the digital meter reach the preset overcurrent protection value. 3. Attach the load and work. (2)Use as a battery charger A module without a constant current function can't be used to charge a battery, because the battery that's used to power the battery is not as strong as the charger, causing the battery to be overcharged and damaged. So firstly, you need to charge the battery with a constant current, and when it's charged to a certain level, it automatically switches back to the constant voltage charge. 1.Make sure the battery's floating charge and charging current.(3.7V/2200mAh lithium battery: the floating charging voltage is 4.2v, and the maximum charging current is 2200mA) 2.Under the condition of no load, adjust the digital meter of the module to the interface of "display output voltage", adjust the "constant voltage potentiometer" to make the output voltage reach the floating charging voltage. 3.Adjust the digital meter to the "display output current" interface and find a thick lead stub for the output of the module. Adjust the "constant current potentiometer" to make the current value on the digital meter reach the preset overcurrent protection value. 4.The default factory charging current is 0.1 times of the charging current. 5.Connect the battery and charge it. (3)As LED constant current drive module 1.Make sure the operating current and maximum operating voltage of the LED. 2.Under the condition of no load, adjust the digital meter of the module to the interface of "display output voltage", adjust the "constant voltage potentiometer" to make the output voltage reach the working voltage of LED. 3. Adjust the digital meter to the "display output current" interface and find a thick lead stub for the output of the module. Adjust the "constant current potentiometer" to make the current value on the digital meter reach the preset overcurrent protection value. 4. Connect LED 1、With USB port which can easily charge your digital products. The output voltage of the USB port of this product is not a fixed standard 5V voltage, but an adjustable voltage, ranging from 1.25 to 32V. 2、High-power constant current LED driver. 3、2 modes of constant voltage and constant current, with an indicator light indicates which mode the module is in. 4、Used as a lithium battery charger, the floating charging voltage and charging current can be set, and there is an indicator indicating whether it is being charged or full. 5、With limited current protection function, even if the output short circuit will not burn out the module.