No products in the cart.
Roll over image to zoom in
Click to open expanded view
DC-DC step-down module constant current and constant voltage 5A lithium ion battery charging LED driver 5-32V to 0.8-30V
|State of Assembly||
1. Used as a common step-down module with over-current protection capability
(1) Adjust the constant voltage potentiometer to make the output voltage reach the voltage value you want
(2) Measure the output short-circuit current with the current gear 10a of the multimeter (directly connect two probes to the output terminal), and adjust the constant current potentiometer to make the output current reach the predetermined over-current protection value. (for example, if the current value displayed by the multimeter is 4a, the maximum current can only reach 4A when you use the module, and the red constant voltage and constant current indicator light will be on when the current reaches 4a, otherwise the indicator light will be off.)
Note: when using in this state, there will be a voltage drop of 0 ~ 0.3V after the load is connected due to the current sampling resistance of 0.05ohm at the output end, which is normal! This voltage drop is not pulled down by your load, but down to the sampling resistance.
2. Used as battery charger
The module without constant current function cannot be used to charge the battery. Due to the large pressure difference between the consumed battery and the charger, the charging current is too large and the battery is damaged. Therefore, constant current charging should be used for the battery at the beginning. When the charging reaches a certain degree, the module will automatically switch back to constant voltage charging.
(1) Determine the floating charge voltage and charging current of the battery you need to charge; (if the parameter of lithium battery is 3.7v/2200mah, the floating charge voltage is 4.2V, and the maximum charging current is 1C, i.e. 2200ma)
(2) Under no-load condition, the multimeter measures the output voltage and adjusts the constant voltage potentiometer to make the output voltage reach floating charge voltage; (if the 3.7V lithium battery is charged, the output voltage can be adjusted to 4.2V)
(3) Measure the output short-circuit current with the current gear 10a of the multimeter (directly connect two probes to the output terminal), and adjust the constant current potentiometer to make the output current reach the predetermined charging current value;
(4) The default factory charging current is 0.1 times of the charging current; (the current of the battery is gradually reduced during the charging process, and gradually changes from constant current charging to constant voltage charging. If the charging current is set to 1a, when the charging current is less than 0.1A, the blue light is off, and the green light is on, and the battery is charged.)
(5) Connect the battery and charge.
(steps 1, 2, 3 and 4 are: input terminal is connected with power supply, and output terminal is not connected with battery when it is empty.)
3. Used as high-power LED constant current drive module
(1) Determine the working current and maximum working voltage you need to drive the LED;
(2) Under no-load condition, the multimeter measures the output voltage and adjusts the constant voltage potentiometer to make the output voltage reach the maximum working voltage of LED;
(3) Measure the output short-circuit current with 10A current gear of multimeter, and adjust the constant current potentiometer to make the output current reach the predetermined led working current;
(4) Connect the LED and test the machine.
(steps 1, 2 and 3 are: input is connected to the power supply, and output is not connected to the LED light when there is no load.)
Note: when this module is used over 3a and 35W, please strengthen the heat dissipation!!!
When will we send your order?
After we receive your order, we will send your order within 7days. (Except holidays)
Is our product original?
We are FlowerDog shop, we have our own factory, all the goods we sell in our store are original.
All products will be tested strictly before shipping. We will use anti-vibration package, in order to ensure that your package can be safely delivered to you. So you have no worries.
How long does it take for me to receive the package?
We use our co-operative logistics, promised delivery time is 15-60 days, if you do not receive the package within 60 days, we will give you a refund or send your order again. Your money is safe. Special countries such as Brazil, Chile, we are committed to delivery time is 15-90 days.
What if I received a product error or damage?
If you receive a product error or damage, please contact us immediately, we will respond quickly and give you a solution, you will get a refund or replacement service.
If you are satisfied with our merchandise, please give us all 5 stars. If you have any questions, please do not give us negative feedback. Please inform us immediately, we will give you the best service and solution.
Please Note :
1. Please fill in your FULL name and FULL address including your Apartment No., Street, City, Region and Country.
And Russian buyer please leaver us your full name, which is very important.
2. We are unable to control the delivery time because it is processed by Third Party service,
but if the parcel can not arrive after delivery protection time, please contact us, we will help you track it and give you a satisfied reply.
3.When Parcel comes , pls Check Face to Face and Sign For it.
|State of Assembly||