Description

12A Buck Converter DC-DC Step Down Power Supply Module w/ Shell 5.3-32V to 1.2-32V CV CC Unassembled

Attention:
The factory default output voltage and current of the module is about 18V / 7A. Because this module is a step-down module, you need to reduce output voltage to below input voltage before it will work. If you find that output voltage cannot be adjusted after receiving the module, first turn CV voltage adjustment potentiometer counterclockwise more than 20 turns. Then use the module to adjust voltage normally. The module is a DC to DC step-down module, and it is not allowed to input AC voltage directly reduced by transformer.

The factory default output of the module is about 18V / 7A. If output is directly short-circuited to adjust current value, a large spark will be generated and it will be dangerous. It is recommended to reduce output voltage to below 10V before short-circuiting output terminal. Turn CC current potentiometer counterclockwise for more than 10 turns to the end, and then short-circuit output terminal and turn CC potentiometer clockwise to increase slowly to your needed setting current value.

Features:
- Crystal shell, beautiful and elegant design, with good touch texture
- Control output ON/OFF via buttons and you can set power-on default to ON or OFF
- LCD can display input and output voltage, output current and output power
- Input terminal with reverse connection protection
- High efficiency over 95%, high current, low heat. 1.2-32V adjustable output voltage, constant current value 0-12A adjustable. Suitable for high power LED constant current drive, etc.

Specifications:
- Input voltage: 5.3-32V (limit 35V; the minimum input can be 4V to achieve voltage reduction, but voltage and current measurement is not accurate when the input is lower than 5.3V)
- Output voltage: 1.2-32V (input voltage must be higher than output voltage, and the minimum voltage difference between the two is 0.8V)
- Output current: can work stably at 8A for a long time, and can reach 12A under enhanced heat dissipation
- Output power: Natural cooling 120W (within 8A), enhanced cooling 160W
- Voltage display: resolution 0.05V, range 0-32V
- Current display: resolution 0.01A, range 0-12A
- Conversion efficiency: about 96%
- Working current: about 25mA
- Soft start: Yes (high power with load module may fail when starting)
- Input reverse connection protection: Yes
- Output end anti-backflow: None
- Short circuit protection: Yes
- Weight: 80g

Functions:
1.The module has two buttons: IN / OUT, ON / OFF. IN / OUT button switches input voltage and output voltage display. Press and hold the button to switch output current and output power display. ON / OFF button controls output ON or OFF. Press and hold the button to set default output state to ON or OFF when it is power-on again.

2.CC is the potentiometer for current setting. Turn it clockwise to increase set current. When load current reaches the set current, it enters constant current state, and CC indicator (red) is lit. CV on the right is a voltage setting potentiometer. Turn it clockwise to increase output voltage. OUT indicator is an output status indicator. The indicator is on when there is voltage at output end, otherwise it will be off.

Using Method:
1. Used as a common step-down module with over-current protection capability
(1) Adjust CV potentiometer to make output voltage reach the voltage value you want.
(2) Turn CC current adjustment potentiometer counterclockwise more than 10 turns to the end. Then use a multimeter 10A or 20A current to measure output short-circuit current (just connect two test probes directly to the output). Adjust CC potentiometer clockwise to make output current reach the over-current protection value you want to set. (For example, the current value displayed by a multimeter is 2A, then the maximum current when you use the module can only reach 2A. When current reaches 2A, red constant current indicator is on, otherwise the indicator is off).

2. Use as a battery charger
Modules without constant current cannot be used to charge battery. Due to the large voltage difference between drained battery and charger, when charging current is too large, battery will be damaged. So at the beginning, battery should be charged with constant current. When charging to a certain level, it automatically switches back to constant voltage charging.

(1) Determine floating charge voltage and charging current of the battery you need to charge. If lithium battery parameter is 3.7V / 2200mAh, then floating charge voltage is 4.2V, and the maximum charging current is 1C, which is 2200mA.
(2) Under no-load conditions, a multimeter measures output voltage and adjusts  constant voltage potentiometer to make output voltage reach floating charge voltage. If you charge a 3.7V lithium battery, you can adjust output voltage to 4.2V.
(3) Turn CC current adjustment potentiometer counterclockwise more than 10 turns to the end, and then use a multimeter 10A or 20A current to measure output short-circuit current (just connect two test probes directly to output end), and adjust CC potentiometer clockwise to make output current reach predetermined charging current value.
(4) Connect battery and charge.

(Steps 1, 2, and 3 are: input end is connected to power supply, and output end is not connected to battery)

Note: Batteries are not included in the package.

3. Used as a high-power LED constant current driver module
(1) Determine the working current and maximum working voltage you need to drive LED;
(2) Under no-load conditions, use a multimeter to measure output voltage. Adjust constant voltage potentiometer to make output voltage reach the maximum working voltage of LED;
(3) Turn CC current adjustment potentiometer counterclockwise more than 10 turns to the end. Then use a multimeter 10A or 20A current to measure output short-circuit current (just connect two test probes directly to output end), and adjust CC potentiometer clockwise to make output current reach predetermined LED working current;
(4) Connect LED and test.

(Steps 1, 2, and 3 are: the input is connected to power supply, and the output is not connected to LED light.)

Precautions:
1. The IN- of the module is forbidden to be short-circuited with the OUT-, otherwise constant current function is invalid.
2. Please ensure that the power of power supply is greater than the power required by output load. Reduce power when the module is hot.
3. Please read the product description carefully before using.
4. Certain electronic knowledge is high recommended. The product is not designed for medical, life saving, life support and other purposes, and cannot be used in hazardous places such as coal mine depots.

Package Included:
- 1 x Set of Step Down Module with Shell

Note: Users need to assemble the shell by themselves.