USB LED Digital Ammeter Voltmeter 5A Constant Current Voltage Step down Board DC Lithum Battery Charger Module Buck Converter

Feature: When you use the product, the module inputs and outputs to be isolated from ground. USB output voltage is consistent with the module, not a fixed 5V output. When charging for digital equment, make sure USB output voltage is 5V. Some customers report:“The module can not adjust the output voltage is always equal to the input voltage.”When you encounter this problem, please counterclockwise rotation of the“voltage potentiometer”10 laps or more, then use the module you can adjust the output voltage. Because the factory default output voltage of about 20V. Specifications: Input voltage range:5-36VDC Output voltage range:1.25-32VDC adjustable Output current: 0-5A Output power: 75W High efficiency up to 96% Built in thermal shutdown function Built in current limit function Built in output short protection function Input reverse polarity protection: None (if required, high current diode in series with the input). Size:L x W x H =68.2×38.8×15mm Application: 1.Use as a step-down modules with overcurrent protection (1) Adjust the right on so that“OUT”LED lighted, Digital meter shows the value of output voltage ,adjust the“voltage potentiometer”so that the output voltage reaches the value you want. (2) Adjust the right on so that Digital meter shows the value of output current;Wire shorted output terminal, then adjust the“current potentiometer”so that the output current reaches a predetermined overcurrent protection value. (For example, the Digital meter displays the current value of 4A, then you can use the module to a maximum current of 4A) (3) Connected to the load. 2.Use as a battery charger (1) Make sure you need to charge the battery float voltage and charging current; (if lithium parameters 3.7V/2200mAh, then the float voltage is 4.2V, the maximum charging current 1C, ie 2200mA) (2)Under no-load conditions, adjust the“Voltage potentiometer”so that the output voltage reaches the float voltage; (if to 3.7V rechargeable lithium battery, the output voltage can be adjusted to 4.2V) (3)Adjust the right on so that Digital meter shows the value of output current;Wire shorted output terminal, then adjust the“current potentiometer”so that the output current reaches a predetermined Charging current value. (4)Charge turn lamp current factory default is 0.1 times the charging current; (Battery during charging current is gradually reduced, if the charge current setting is 1A, then when the charge current is le than 0.1A, blue lights turned off, the green light is on, which means that the battery is fullycharged) (5)connected to the battery charge. (1,2,3,4 steps as: Output is unloaded, do not connect the battery) 3.Use as a LED constant current driver module: (1)Adjust the“voltage potentiometer”so that the output voltage reaches the value you want. (2)Adjust the right on so that Digital meter shows the value of output current;Wire shorted output terminal, then adjust the“current potentiometer”so that the output current reaches a predetermined LED operating current. (3)Connect LED, work. (1,2 steps as: Output is unloaded, do not connect LED) 4.Voltmeter and ammeter calibration method: Module with manual calibration function can correct display precision voltage and current, if you think the current voltage and current accuracy to meet the requirements, do not perform the following operations. (1) Output voltage calibration steps Step 1, adjust the right on so that“OUT”LED lighted, Digital meter shows the value of output voltage; Pre the right on for more than 2 seconds, release, Digital meter and“OUT”LED flashes in synchronization so that you enter the output voltage calibration mode. Step 2, pre the right on (normal speed), the voltage value is adding up a unit; Pre the left on, minus a unit; Due to a unit is le than 0.1V, the minimum voltage display to 0.1V, so you need to continuously pre 1-5 times to see the voltmeter change 0.1V, how many times voltmeter change 0.1V by preing the key, depending on the current display voltage, the higher the voltage, the fewer the number of pre. Step 3, pre the right on for more than 2 seconds, release, to exit the output voltage calibration mode. All parameters set to automatically power down to save. (2) Input voltage calibration steps Step 1, adjust the right on so that“IN”LED lighted, Digital meter shows the value of input voltage; pre the right on for more than 2 seconds, release, Digital meter and“IN”LED flashes in synchronization so that you enter the input voltage calibration mode. Steps 2 and 3, consistent with the output voltage calibration method. (3)Output current calibration steps Step 1, adjust the right on so that Digital meter shows the value of output Current. Pre the right on for more than 2 seconds, release, Digital meter flashes in synchronization so that you enter the out About shping
Shping and Packaging All it will be double checked and well packed before sending.It will be dispatched within 2 business days after buyers pay for the order. It usually takes about 14 to 18 working days for delivering the package to the destination(for e areas,it may take a little longer). 

Special Announcement:
Please fill in the correct and detailed consignee, address and phone number in the order. For fast and correct delivery.If you do not receive order within 30 working days,please feel free to contact Customer Service before leaving Negative and Neutral Feedback, we will do our best to help you resoe the problem.TaxNo, you will only pay what is quoted as total cost at checkout, no more. You are not expected to pay any additional duties or taxes. If you are asked by Customs or our logistic partner to pay duties, please contact our Customer Service .

Your 100% satisfaction is very ant to us
If the product is not on good condition, You can return this product within 14 working days, please contact customer service center before returning.FeedbackYour satisfaction is our first priorityIf you receive the order and it is in good condition,we would be grateful if you would leave us 5 star Positive Feedback for the transaction.